1399 lines
30 KiB
C
1399 lines
30 KiB
C
/* RCS utility functions */
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/* Copyright 1982, 1988, 1989 Walter Tichy
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Copyright 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert
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Distributed under license by the Free Software Foundation, Inc.
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This file is part of RCS.
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RCS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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RCS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with RCS; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Report problems and direct all questions to:
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rcs-bugs@cs.purdue.edu
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*/
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/*
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* Revision 5.20 1995/06/16 06:19:24 eggert
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* (catchsig): Remove `return'.
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* Update FSF address.
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*
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* Revision 5.19 1995/06/02 18:19:00 eggert
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* (catchsigaction): New name for `catchsig', for sa_sigaction signature.
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* Use nRCS even if !has_psiginfo, to remove unused variable warning.
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* (setup_catchsig): Use sa_sigaction only if has_sa_sigaction.
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* Use ENOTSUP only if defined.
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*
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* Revision 5.18 1995/06/01 16:23:43 eggert
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* (catchsig, restoreints, setup_catchsig): Use SA_SIGINFO, not has_psiginfo,
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* to determine whether to use SA_SIGINFO feature,
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* but also check at runtime whether the feature works.
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* (catchsig): If an mmap_signal occurs, report the affected file name.
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* (unsupported_SA_SIGINFO, accessName): New variables.
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* (setup_catchsig): If using SA_SIGINFO, use sa_sigaction, not sa_handler.
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* If SA_SIGINFO fails, fall back on sa_handler method.
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*
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* (readAccessFilenameBuffer, dupSafer, fdSafer, fopenSafer): New functions.
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* (concatenate): Remove.
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*
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* (runv): Work around bad_wait_if_SIGCHLD_ignored bug.
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* Remove reference to OPEN_O_WORK.
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*
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* Revision 5.17 1994/03/20 04:52:58 eggert
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* Specify subprocess input via file descriptor, not file name.
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* Avoid messing with I/O buffers in the child process.
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* Define dup in terms of F_DUPFD if it exists.
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* Move setmtime to rcsedit.c. Remove lint.
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*
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* Revision 5.16 1993/11/09 17:40:15 eggert
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* -V now prints version on stdout and exits.
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*
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* Revision 5.15 1993/11/03 17:42:27 eggert
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* Use psiginfo and setreuid if available. Move date2str to maketime.c.
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*
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* Revision 5.14 1992/07/28 16:12:44 eggert
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* Add -V. has_sigaction overrides sig_zaps_handler. Fix -M bug.
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* Add mmap_signal, which minimizes signal handling for non-mmap hosts.
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*
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* Revision 5.13 1992/02/17 23:02:28 eggert
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* Work around NFS mmap SIGBUS problem. Add -T support.
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*
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* Revision 5.12 1992/01/24 18:44:19 eggert
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* Work around NFS mmap bug that leads to SIGBUS core dumps. lint -> RCS_lint
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*
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* Revision 5.11 1992/01/06 02:42:34 eggert
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* O_BINARY -> OPEN_O_WORK
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* while (E) ; -> while (E) continue;
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*
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* Revision 5.10 1991/10/07 17:32:46 eggert
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* Support piece tables even if !has_mmap.
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*
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* Revision 5.9 1991/08/19 03:13:55 eggert
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* Add spawn() support. Explicate assumptions about getting invoker's name.
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* Standardize user-visible dates. Tune.
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*
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* Revision 5.8 1991/04/21 11:58:30 eggert
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* Plug setuid security hole.
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*
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* Revision 5.6 1991/02/26 17:48:39 eggert
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* Fix setuid bug. Use fread, fwrite more portably.
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* Support waitpid. Don't assume -1 is acceptable to W* macros.
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* strsave -> str_save (DG/UX name clash)
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*
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* Revision 5.5 1990/12/04 05:18:49 eggert
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* Don't output a blank line after a signal diagnostic.
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* Use -I for prompts and -q for diagnostics.
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*
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* Revision 5.4 1990/11/01 05:03:53 eggert
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* Remove unneeded setid check. Add awrite(), fremember().
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*
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* Revision 5.3 1990/10/06 00:16:45 eggert
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* Don't fread F if feof(F).
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*
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* Revision 5.2 1990/09/04 08:02:31 eggert
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* Store fread()'s result in an fread_type object.
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*
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* Revision 5.1 1990/08/29 07:14:07 eggert
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* Declare getpwuid() more carefully.
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*
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* Revision 5.0 1990/08/22 08:13:46 eggert
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* Add setuid support. Permit multiple locks per user.
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* Remove compile-time limits; use malloc instead.
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* Switch to GMT. Permit dates past 1999/12/31.
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* Add -V. Remove snooping. Ansify and Posixate.
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* Tune. Some USG hosts define NSIG but not sys_siglist.
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* Don't run /bin/sh if it's hopeless.
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* Don't leave garbage behind if the output is an empty pipe.
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* Clean up after SIGXCPU or SIGXFSZ. Print name of signal that caused cleanup.
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*
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* Revision 4.6 89/05/01 15:13:40 narten
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* changed copyright header to reflect current distribution rules
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*
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* Revision 4.5 88/11/08 16:01:02 narten
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* corrected use of varargs routines
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*
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* Revision 4.4 88/08/09 19:13:24 eggert
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* Check for memory exhaustion.
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* Permit signal handlers to yield either 'void' or 'int'; fix oldSIGINT botch.
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* Use execv(), not system(); yield exit status like diff(1)'s.
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*
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* Revision 4.3 87/10/18 10:40:22 narten
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* Updating version numbers. Changes relative to 1.1 actually
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* relative to 4.1
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*
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* Revision 1.3 87/09/24 14:01:01 narten
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* Sources now pass through lint (if you ignore printf/sprintf/fprintf
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* warnings)
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*
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* Revision 1.2 87/03/27 14:22:43 jenkins
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* Port to suns
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*
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* Revision 4.1 83/05/10 15:53:13 wft
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* Added getcaller() and findlock().
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* Changed catchints() to check SIGINT for SIG_IGN before setting up the signal
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* (needed for background jobs in older shells). Added restoreints().
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* Removed printing of full RCS path from logcommand().
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*
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* Revision 3.8 83/02/15 15:41:49 wft
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* Added routine fastcopy() to copy remainder of a file in blocks.
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*
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* Revision 3.7 82/12/24 15:25:19 wft
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* added catchints(), ignoreints() for catching and ingnoring interrupts;
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* fixed catchsig().
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*
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* Revision 3.6 82/12/08 21:52:05 wft
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* Using DATEFORM to format dates.
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*
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* Revision 3.5 82/12/04 18:20:49 wft
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* Replaced SNOOPDIR with SNOOPFILE; changed addlock() to update
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* lockedby-field.
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*
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* Revision 3.4 82/12/03 17:17:43 wft
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* Added check to addlock() ensuring only one lock per person.
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* Addlock also returns a pointer to the lock created. Deleted fancydate().
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*
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* Revision 3.3 82/11/27 12:24:37 wft
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* moved rmsema(), trysema(), trydiraccess(), getfullRCSname() to rcsfnms.c.
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* Introduced macro SNOOP so that snoop can be placed in directory other than
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* TARGETDIR. Changed %02d to %.2d for compatibility reasons.
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*
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* Revision 3.2 82/10/18 21:15:11 wft
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* added function getfullRCSname().
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*
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* Revision 3.1 82/10/13 16:17:37 wft
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* Cleanup message is now suppressed in quiet mode.
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*/
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#include "rcsbase.h"
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libId(utilId, "$FreeBSD$")
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#if !has_memcmp
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int
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memcmp(s1, s2, n)
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void const *s1, *s2;
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size_t n;
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{
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register unsigned char const
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*p1 = (unsigned char const*)s1,
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*p2 = (unsigned char const*)s2;
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register size_t i = n;
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register int r = 0;
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while (i-- && !(r = (*p1++ - *p2++)))
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;
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return r;
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}
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#endif
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#if !has_memcpy
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void *
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memcpy(s1, s2, n)
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void *s1;
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void const *s2;
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size_t n;
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{
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register char *p1 = (char*)s1;
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register char const *p2 = (char const*)s2;
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while (n--)
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*p1++ = *p2++;
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return s1;
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}
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#endif
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#if RCS_lint
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malloc_type lintalloc;
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#endif
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/*
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* list of blocks allocated with ftestalloc()
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* These blocks can be freed by ffree when we're done with the current file.
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* We could put the free block inside struct alloclist, rather than a pointer
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* to the free block, but that would be less portable.
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*/
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struct alloclist {
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malloc_type alloc;
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struct alloclist *nextalloc;
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};
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static struct alloclist *alloced;
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static malloc_type okalloc P((malloc_type));
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static malloc_type
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okalloc(p)
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malloc_type p;
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{
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if (!p)
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faterror("out of memory");
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return p;
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}
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malloc_type
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testalloc(size)
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size_t size;
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/* Allocate a block, testing that the allocation succeeded. */
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{
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return okalloc(malloc(size));
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}
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malloc_type
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testrealloc(ptr, size)
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malloc_type ptr;
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size_t size;
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/* Reallocate a block, testing that the allocation succeeded. */
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{
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return okalloc(realloc(ptr, size));
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}
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malloc_type
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fremember(ptr)
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malloc_type ptr;
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/* Remember PTR in 'alloced' so that it can be freed later. Yield PTR. */
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{
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register struct alloclist *q = talloc(struct alloclist);
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q->nextalloc = alloced;
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alloced = q;
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return q->alloc = ptr;
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}
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malloc_type
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ftestalloc(size)
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size_t size;
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/* Allocate a block, putting it in 'alloced' so it can be freed later. */
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{
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return fremember(testalloc(size));
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}
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void
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ffree()
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/* Free all blocks allocated with ftestalloc(). */
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{
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register struct alloclist *p, *q;
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for (p = alloced; p; p = q) {
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q = p->nextalloc;
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tfree(p->alloc);
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tfree(p);
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}
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alloced = 0;
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}
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void
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ffree1(f)
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register char const *f;
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/* Free the block f, which was allocated by ftestalloc. */
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{
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register struct alloclist *p, **a = &alloced;
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while ((p = *a)->alloc != f)
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a = &p->nextalloc;
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*a = p->nextalloc;
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tfree(p->alloc);
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tfree(p);
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}
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char *
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str_save(s)
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char const *s;
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/* Save s in permanently allocated storage. */
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{
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return strcpy(tnalloc(char, strlen(s)+1), s);
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}
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char *
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fstr_save(s)
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char const *s;
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/* Save s in storage that will be deallocated when we're done with this file. */
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{
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return strcpy(ftnalloc(char, strlen(s)+1), s);
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}
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char *
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cgetenv(name)
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char const *name;
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/* Like getenv(), but yield a copy; getenv() can overwrite old results. */
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{
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register char *p;
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return (p=getenv(name)) ? str_save(p) : p;
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}
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char const *
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getusername(suspicious)
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int suspicious;
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/* Get the caller's login name. Trust only getwpuid if SUSPICIOUS. */
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{
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static char *name;
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if (!name) {
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if (
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/* Prefer getenv() unless suspicious; it's much faster. */
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# if getlogin_is_secure
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(suspicious
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|| (
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!(name = cgetenv("LOGNAME"))
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&& !(name = cgetenv("USER"))
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))
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&& !(name = getlogin())
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# else
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suspicious
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|| (
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!(name = cgetenv("LOGNAME"))
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&& !(name = cgetenv("USER"))
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&& !(name = getlogin())
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)
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# endif
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) {
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#if has_getuid && has_getpwuid
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struct passwd const *pw = getpwuid(ruid());
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if (!pw)
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faterror("no password entry for userid %lu",
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(unsigned long)ruid()
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);
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name = pw->pw_name;
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#else
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#if has_setuid
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faterror("setuid not supported");
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#else
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faterror("Who are you? Please setenv LOGNAME.");
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#endif
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#endif
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}
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checksid(name);
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}
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return name;
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}
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#if has_signal
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/*
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* Signal handling
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*
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* Standard C places too many restrictions on signal handlers.
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* We obey as many of them as we can.
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* Posix places fewer restrictions, and we are Posix-compatible here.
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*/
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static sig_atomic_t volatile heldsignal, holdlevel;
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#ifdef SA_SIGINFO
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static int unsupported_SA_SIGINFO;
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static siginfo_t bufsiginfo;
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static siginfo_t *volatile heldsiginfo;
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#endif
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#if has_NFS && has_mmap && large_memory && mmap_signal
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static char const *accessName;
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void
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readAccessFilenameBuffer(filename, p)
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char const *filename;
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unsigned char const *p;
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{
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unsigned char volatile t;
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accessName = filename;
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t = *p;
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accessName = 0;
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}
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#else
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# define accessName ((char const *) 0)
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#endif
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#if !has_psignal
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# define psignal my_psignal
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static void my_psignal P((int,char const*));
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static void
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my_psignal(sig, s)
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int sig;
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char const *s;
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{
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char const *sname = "Unknown signal";
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# if has_sys_siglist && defined(NSIG)
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if ((unsigned)sig < NSIG)
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sname = sys_siglist[sig];
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# else
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switch (sig) {
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# ifdef SIGHUP
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case SIGHUP: sname = "Hangup"; break;
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# endif
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# ifdef SIGINT
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case SIGINT: sname = "Interrupt"; break;
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# endif
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# ifdef SIGPIPE
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case SIGPIPE: sname = "Broken pipe"; break;
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# endif
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# ifdef SIGQUIT
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case SIGQUIT: sname = "Quit"; break;
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# endif
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# ifdef SIGTERM
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case SIGTERM: sname = "Terminated"; break;
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# endif
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# ifdef SIGXCPU
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case SIGXCPU: sname = "Cputime limit exceeded"; break;
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# endif
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# ifdef SIGXFSZ
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case SIGXFSZ: sname = "Filesize limit exceeded"; break;
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# endif
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# if has_mmap && large_memory
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# if defined(SIGBUS) && mmap_signal==SIGBUS
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case SIGBUS: sname = "Bus error"; break;
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# endif
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# if defined(SIGSEGV) && mmap_signal==SIGSEGV
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case SIGSEGV: sname = "Segmentation fault"; break;
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# endif
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# endif
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}
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# endif
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/* Avoid calling sprintf etc., in case they're not reentrant. */
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{
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char const *p;
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char buf[BUFSIZ], *b = buf;
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for (p = s; *p; *b++ = *p++)
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continue;
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*b++ = ':';
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*b++ = ' ';
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for (p = sname; *p; *b++ = *p++)
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continue;
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*b++ = '\n';
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VOID write(STDERR_FILENO, buf, b - buf);
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}
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}
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#endif
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static signal_type catchsig P((int));
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#ifdef SA_SIGINFO
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static signal_type catchsigaction P((int,siginfo_t*,void*));
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#endif
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static signal_type
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catchsig(s)
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int s;
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#ifdef SA_SIGINFO
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{
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catchsigaction(s, (siginfo_t *)0, (void *)0);
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}
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static signal_type
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catchsigaction(s, i, c)
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int s;
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siginfo_t *i;
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void *c;
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#endif
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{
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# if sig_zaps_handler
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/* If a signal arrives before we reset the handler, we lose. */
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VOID signal(s, SIG_IGN);
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# endif
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# ifdef SA_SIGINFO
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if (!unsupported_SA_SIGINFO)
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i = 0;
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# endif
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if (holdlevel) {
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heldsignal = s;
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# ifdef SA_SIGINFO
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if (i) {
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bufsiginfo = *i;
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heldsiginfo = &bufsiginfo;
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}
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# endif
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return;
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}
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ignoreints();
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setrid();
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if (!quietflag) {
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/* Avoid calling sprintf etc., in case they're not reentrant. */
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char const *p;
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char buf[BUFSIZ], *b = buf;
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if ( ! (
|
|
# if has_mmap && large_memory && mmap_signal
|
|
/* Check whether this signal was planned. */
|
|
s == mmap_signal && accessName
|
|
# else
|
|
0
|
|
# endif
|
|
)) {
|
|
char const *nRCS = "\nRCS";
|
|
# if defined(SA_SIGINFO) && has_si_errno && has_mmap && large_memory && mmap_signal
|
|
if (s == mmap_signal && i && i->si_errno) {
|
|
errno = i->si_errno;
|
|
perror(nRCS++);
|
|
}
|
|
# endif
|
|
# if defined(SA_SIGINFO) && has_psiginfo
|
|
if (i)
|
|
psiginfo(i, nRCS);
|
|
else
|
|
psignal(s, nRCS);
|
|
# else
|
|
psignal(s, nRCS);
|
|
# endif
|
|
}
|
|
|
|
for (p = "RCS: "; *p; *b++ = *p++)
|
|
continue;
|
|
# if has_mmap && large_memory && mmap_signal
|
|
if (s == mmap_signal) {
|
|
p = accessName;
|
|
if (!p)
|
|
p = "Was a file changed by some other process? ";
|
|
else {
|
|
char const *p1;
|
|
for (p1 = p; *p1; p1++)
|
|
continue;
|
|
VOID write(STDERR_FILENO, buf, b - buf);
|
|
VOID write(STDERR_FILENO, p, p1 - p);
|
|
b = buf;
|
|
p = ": Permission denied. ";
|
|
}
|
|
while (*p)
|
|
*b++ = *p++;
|
|
}
|
|
# endif
|
|
for (p = "Cleaning up.\n"; *p; *b++ = *p++)
|
|
continue;
|
|
VOID write(STDERR_FILENO, buf, b - buf);
|
|
}
|
|
exiterr();
|
|
}
|
|
|
|
void
|
|
ignoreints()
|
|
{
|
|
++holdlevel;
|
|
}
|
|
|
|
void
|
|
restoreints()
|
|
{
|
|
if (!--holdlevel && heldsignal)
|
|
# ifdef SA_SIGINFO
|
|
VOID catchsigaction(heldsignal, heldsiginfo, (void *)0);
|
|
# else
|
|
VOID catchsig(heldsignal);
|
|
# endif
|
|
}
|
|
|
|
|
|
static void setup_catchsig P((int const*,int));
|
|
|
|
#if has_sigaction
|
|
|
|
static void check_sig P((int));
|
|
static void
|
|
check_sig(r)
|
|
int r;
|
|
{
|
|
if (r != 0)
|
|
efaterror("signal handling");
|
|
}
|
|
|
|
static void
|
|
setup_catchsig(sig, sigs)
|
|
int const *sig;
|
|
int sigs;
|
|
{
|
|
register int i, j;
|
|
struct sigaction act;
|
|
|
|
for (i=sigs; 0<=--i; ) {
|
|
check_sig(sigaction(sig[i], (struct sigaction*)0, &act));
|
|
if (act.sa_handler != SIG_IGN) {
|
|
act.sa_handler = catchsig;
|
|
# ifdef SA_SIGINFO
|
|
if (!unsupported_SA_SIGINFO) {
|
|
# if has_sa_sigaction
|
|
act.sa_sigaction = catchsigaction;
|
|
# else
|
|
act.sa_handler = catchsigaction;
|
|
# endif
|
|
act.sa_flags |= SA_SIGINFO;
|
|
}
|
|
# endif
|
|
for (j=sigs; 0<=--j; )
|
|
check_sig(sigaddset(&act.sa_mask, sig[j]));
|
|
if (sigaction(sig[i], &act, (struct sigaction*)0) != 0) {
|
|
# if defined(SA_SIGINFO) && defined(ENOTSUP)
|
|
if (errno == ENOTSUP && !unsupported_SA_SIGINFO) {
|
|
/* Turn off use of SA_SIGINFO and try again. */
|
|
unsupported_SA_SIGINFO = 1;
|
|
i++;
|
|
continue;
|
|
}
|
|
# endif
|
|
check_sig(-1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#else
|
|
#if has_sigblock
|
|
|
|
static void
|
|
setup_catchsig(sig, sigs)
|
|
int const *sig;
|
|
int sigs;
|
|
{
|
|
register int i;
|
|
int mask;
|
|
|
|
mask = 0;
|
|
for (i=sigs; 0<=--i; )
|
|
mask |= sigmask(sig[i]);
|
|
mask = sigblock(mask);
|
|
for (i=sigs; 0<=--i; )
|
|
if (
|
|
signal(sig[i], catchsig) == SIG_IGN &&
|
|
signal(sig[i], SIG_IGN) != catchsig
|
|
)
|
|
faterror("signal catcher failure");
|
|
VOID sigsetmask(mask);
|
|
}
|
|
|
|
#else
|
|
|
|
static void
|
|
setup_catchsig(sig, sigs)
|
|
int const *sig;
|
|
int sigs;
|
|
{
|
|
register i;
|
|
|
|
for (i=sigs; 0<=--i; )
|
|
if (
|
|
signal(sig[i], SIG_IGN) != SIG_IGN &&
|
|
signal(sig[i], catchsig) != SIG_IGN
|
|
)
|
|
faterror("signal catcher failure");
|
|
}
|
|
|
|
#endif
|
|
#endif
|
|
|
|
|
|
static int const regsigs[] = {
|
|
# ifdef SIGHUP
|
|
SIGHUP,
|
|
# endif
|
|
# ifdef SIGINT
|
|
SIGINT,
|
|
# endif
|
|
# ifdef SIGPIPE
|
|
SIGPIPE,
|
|
# endif
|
|
# ifdef SIGQUIT
|
|
SIGQUIT,
|
|
# endif
|
|
# ifdef SIGTERM
|
|
SIGTERM,
|
|
# endif
|
|
# ifdef SIGXCPU
|
|
SIGXCPU,
|
|
# endif
|
|
# ifdef SIGXFSZ
|
|
SIGXFSZ,
|
|
# endif
|
|
};
|
|
|
|
void
|
|
catchints()
|
|
{
|
|
static int catching_ints;
|
|
if (!catching_ints) {
|
|
catching_ints = true;
|
|
setup_catchsig(regsigs, (int) (sizeof(regsigs)/sizeof(*regsigs)));
|
|
}
|
|
}
|
|
|
|
#if has_mmap && large_memory && mmap_signal
|
|
|
|
/*
|
|
* If you mmap an NFS file, and someone on another client removes the last
|
|
* link to that file, and you later reference an uncached part of that file,
|
|
* you'll get a SIGBUS or SIGSEGV (depending on the operating system).
|
|
* Catch the signal and report the problem to the user.
|
|
* Unfortunately, there's no portable way to differentiate between this
|
|
* problem and actual bugs in the program.
|
|
* This NFS problem is rare, thank goodness.
|
|
*
|
|
* This can also occur if someone truncates the file, even without NFS.
|
|
*/
|
|
|
|
static int const mmapsigs[] = { mmap_signal };
|
|
|
|
void
|
|
catchmmapints()
|
|
{
|
|
static int catching_mmap_ints;
|
|
if (!catching_mmap_ints) {
|
|
catching_mmap_ints = true;
|
|
setup_catchsig(mmapsigs, (int)(sizeof(mmapsigs)/sizeof(*mmapsigs)));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#endif /* has_signal */
|
|
|
|
|
|
void
|
|
fastcopy(inf,outf)
|
|
register RILE *inf;
|
|
FILE *outf;
|
|
/* Function: copies the remainder of file inf to outf.
|
|
*/
|
|
{
|
|
#if large_memory
|
|
# if maps_memory
|
|
awrite((char const*)inf->ptr, (size_t)(inf->lim - inf->ptr), outf);
|
|
inf->ptr = inf->lim;
|
|
# else
|
|
for (;;) {
|
|
awrite((char const*)inf->ptr, (size_t)(inf->readlim - inf->ptr), outf);
|
|
inf->ptr = inf->readlim;
|
|
if (inf->ptr == inf->lim)
|
|
break;
|
|
VOID Igetmore(inf);
|
|
}
|
|
# endif
|
|
#else
|
|
char buf[BUFSIZ*8];
|
|
register fread_type rcount;
|
|
|
|
/*now read the rest of the file in blocks*/
|
|
while (!feof(inf)) {
|
|
if (!(rcount = Fread(buf,sizeof(*buf),sizeof(buf),inf))) {
|
|
testIerror(inf);
|
|
return;
|
|
}
|
|
awrite(buf, (size_t)rcount, outf);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifndef SSIZE_MAX
|
|
/* This does not work in #ifs, but it's good enough for us. */
|
|
/* Underestimating SSIZE_MAX may slow us down, but it won't break us. */
|
|
# define SSIZE_MAX ((unsigned)-1 >> 1)
|
|
#endif
|
|
|
|
void
|
|
awrite(buf, chars, f)
|
|
char const *buf;
|
|
size_t chars;
|
|
FILE *f;
|
|
{
|
|
/* Posix 1003.1-1990 ssize_t hack */
|
|
while (SSIZE_MAX < chars) {
|
|
if (Fwrite(buf, sizeof(*buf), SSIZE_MAX, f) != SSIZE_MAX)
|
|
Oerror();
|
|
buf += SSIZE_MAX;
|
|
chars -= SSIZE_MAX;
|
|
}
|
|
|
|
if (Fwrite(buf, sizeof(*buf), chars, f) != chars)
|
|
Oerror();
|
|
}
|
|
|
|
/* dup a file descriptor; the result must not be stdin, stdout, or stderr. */
|
|
static int dupSafer P((int));
|
|
static int
|
|
dupSafer(fd)
|
|
int fd;
|
|
{
|
|
# ifdef F_DUPFD
|
|
return fcntl(fd, F_DUPFD, STDERR_FILENO + 1);
|
|
# else
|
|
int e, f, i, used = 0;
|
|
while (STDIN_FILENO <= (f = dup(fd)) && f <= STDERR_FILENO)
|
|
used |= 1<<f;
|
|
e = errno;
|
|
for (i = STDIN_FILENO; i <= STDERR_FILENO; i++)
|
|
if (used & (1<<i))
|
|
VOID close(i);
|
|
errno = e;
|
|
return f;
|
|
# endif
|
|
}
|
|
|
|
/* Renumber a file descriptor so that it's not stdin, stdout, or stderr. */
|
|
int
|
|
fdSafer(fd)
|
|
int fd;
|
|
{
|
|
if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) {
|
|
int f = dupSafer(fd);
|
|
int e = errno;
|
|
VOID close(fd);
|
|
errno = e;
|
|
fd = f;
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
/* Like fopen, except the result is never stdin, stdout, or stderr. */
|
|
FILE *
|
|
fopenSafer(filename, type)
|
|
char const *filename;
|
|
char const *type;
|
|
{
|
|
FILE *stream = fopen(filename, type);
|
|
if (stream) {
|
|
int fd = fileno(stream);
|
|
if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) {
|
|
int f = dupSafer(fd);
|
|
if (f < 0) {
|
|
int e = errno;
|
|
VOID fclose(stream);
|
|
errno = e;
|
|
return 0;
|
|
}
|
|
if (fclose(stream) != 0) {
|
|
int e = errno;
|
|
VOID close(f);
|
|
errno = e;
|
|
return 0;
|
|
}
|
|
stream = fdopen(f, type);
|
|
}
|
|
}
|
|
return stream;
|
|
}
|
|
|
|
|
|
#ifdef F_DUPFD
|
|
# undef dup
|
|
# define dup(fd) fcntl(fd, F_DUPFD, 0)
|
|
#endif
|
|
|
|
|
|
#if has_fork || has_spawn
|
|
|
|
static int movefd P((int,int));
|
|
static int
|
|
movefd(old, new)
|
|
int old, new;
|
|
{
|
|
if (old < 0 || old == new)
|
|
return old;
|
|
# ifdef F_DUPFD
|
|
new = fcntl(old, F_DUPFD, new);
|
|
# else
|
|
new = dup2(old, new);
|
|
# endif
|
|
return close(old)==0 ? new : -1;
|
|
}
|
|
|
|
static int fdreopen P((int,char const*,int));
|
|
static int
|
|
fdreopen(fd, file, flags)
|
|
int fd;
|
|
char const *file;
|
|
int flags;
|
|
{
|
|
int newfd;
|
|
VOID close(fd);
|
|
newfd =
|
|
#if !open_can_creat
|
|
flags&O_CREAT ? creat(file, S_IRUSR|S_IWUSR) :
|
|
#endif
|
|
open(file, flags, S_IRUSR|S_IWUSR);
|
|
return movefd(newfd, fd);
|
|
}
|
|
|
|
#if has_spawn
|
|
static void redirect P((int,int));
|
|
static void
|
|
redirect(old, new)
|
|
int old, new;
|
|
/*
|
|
* Move file descriptor OLD to NEW.
|
|
* If OLD is -1, do nothing.
|
|
* If OLD is -2, just close NEW.
|
|
*/
|
|
{
|
|
if ((old != -1 && close(new) != 0) || (0 <= old && movefd(old,new) < 0))
|
|
efaterror("spawn I/O redirection");
|
|
}
|
|
#endif
|
|
|
|
|
|
#else /* !has_fork && !has_spawn */
|
|
|
|
static void bufargcat P((struct buf*,int,char const*));
|
|
static void
|
|
bufargcat(b, c, s)
|
|
register struct buf *b;
|
|
int c;
|
|
register char const *s;
|
|
/* Append to B a copy of C, plus a quoted copy of S. */
|
|
{
|
|
register char *p;
|
|
register char const *t;
|
|
size_t bl, sl;
|
|
|
|
for (t=s, sl=0; *t; )
|
|
sl += 3*(*t++=='\'') + 1;
|
|
bl = strlen(b->string);
|
|
bufrealloc(b, bl + sl + 4);
|
|
p = b->string + bl;
|
|
*p++ = c;
|
|
*p++ = '\'';
|
|
while (*s) {
|
|
if (*s == '\'') {
|
|
*p++ = '\'';
|
|
*p++ = '\\';
|
|
*p++ = '\'';
|
|
}
|
|
*p++ = *s++;
|
|
}
|
|
*p++ = '\'';
|
|
*p = 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if !has_spawn && has_fork
|
|
/*
|
|
* Output the string S to stderr, without touching any I/O buffers.
|
|
* This is useful if you are a child process, whose buffers are usually wrong.
|
|
* Exit immediately if the write does not completely succeed.
|
|
*/
|
|
static void write_stderr P((char const *));
|
|
static void
|
|
write_stderr(s)
|
|
char const *s;
|
|
{
|
|
size_t slen = strlen(s);
|
|
if (write(STDERR_FILENO, s, slen) != slen)
|
|
_exit(EXIT_TROUBLE);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Run a command.
|
|
* infd, if not -1, is the input file descriptor.
|
|
* outname, if nonzero, is the name of the output file.
|
|
* args[1..] form the command to be run; args[0] might be modified.
|
|
*/
|
|
int
|
|
runv(infd, outname, args)
|
|
int infd;
|
|
char const *outname, **args;
|
|
{
|
|
int wstatus;
|
|
|
|
#if bad_wait_if_SIGCHLD_ignored
|
|
static int fixed_SIGCHLD;
|
|
if (!fixed_SIGCHLD) {
|
|
fixed_SIGCHLD = true;
|
|
# ifndef SIGCHLD
|
|
# define SIGCHLD SIGCLD
|
|
# endif
|
|
VOID signal(SIGCHLD, SIG_DFL);
|
|
}
|
|
#endif
|
|
|
|
oflush();
|
|
eflush();
|
|
{
|
|
#if has_spawn
|
|
int in, out;
|
|
char const *file;
|
|
|
|
in = -1;
|
|
if (infd != -1 && infd != STDIN_FILENO) {
|
|
if ((in = dup(STDIN_FILENO)) < 0) {
|
|
if (errno != EBADF)
|
|
efaterror("spawn input setup");
|
|
in = -2;
|
|
} else {
|
|
# ifdef F_DUPFD
|
|
if (close(STDIN_FILENO) != 0)
|
|
efaterror("spawn input close");
|
|
# endif
|
|
}
|
|
if (
|
|
# ifdef F_DUPFD
|
|
fcntl(infd, F_DUPFD, STDIN_FILENO) != STDIN_FILENO
|
|
# else
|
|
dup2(infd, STDIN_FILENO) != STDIN_FILENO
|
|
# endif
|
|
)
|
|
efaterror("spawn input redirection");
|
|
}
|
|
|
|
out = -1;
|
|
if (outname) {
|
|
if ((out = dup(STDOUT_FILENO)) < 0) {
|
|
if (errno != EBADF)
|
|
efaterror("spawn output setup");
|
|
out = -2;
|
|
}
|
|
if (fdreopen(
|
|
STDOUT_FILENO, outname,
|
|
O_CREAT | O_TRUNC | O_WRONLY
|
|
) < 0)
|
|
efaterror(outname);
|
|
}
|
|
|
|
wstatus = spawn_RCS(0, args[1], (char**)(args + 1));
|
|
# ifdef RCS_SHELL
|
|
if (wstatus == -1 && errno == ENOEXEC) {
|
|
args[0] = RCS_SHELL;
|
|
wstatus = spawnv(0, args[0], (char**)args);
|
|
}
|
|
# endif
|
|
redirect(in, STDIN_FILENO);
|
|
redirect(out, STDOUT_FILENO);
|
|
#else
|
|
#if has_fork
|
|
pid_t pid;
|
|
if (!(pid = vfork())) {
|
|
char const *notfound;
|
|
if (infd != -1 && infd != STDIN_FILENO && (
|
|
# ifdef F_DUPFD
|
|
(VOID close(STDIN_FILENO),
|
|
fcntl(infd, F_DUPFD, STDIN_FILENO) != STDIN_FILENO)
|
|
# else
|
|
dup2(infd, STDIN_FILENO) != STDIN_FILENO
|
|
# endif
|
|
)) {
|
|
/* Avoid perror since it may misuse buffers. */
|
|
write_stderr(args[1]);
|
|
write_stderr(": I/O redirection failed\n");
|
|
_exit(EXIT_TROUBLE);
|
|
}
|
|
|
|
if (outname)
|
|
if (fdreopen(
|
|
STDOUT_FILENO, outname,
|
|
O_CREAT | O_TRUNC | O_WRONLY
|
|
) < 0) {
|
|
/* Avoid perror since it may misuse buffers. */
|
|
write_stderr(args[1]);
|
|
write_stderr(": ");
|
|
write_stderr(outname);
|
|
write_stderr(": cannot create\n");
|
|
_exit(EXIT_TROUBLE);
|
|
}
|
|
VOID exec_RCS(args[1], (char**)(args + 1));
|
|
notfound = args[1];
|
|
# ifdef RCS_SHELL
|
|
if (errno == ENOEXEC) {
|
|
args[0] = notfound = RCS_SHELL;
|
|
VOID execv(args[0], (char**)args);
|
|
}
|
|
# endif
|
|
|
|
/* Avoid perror since it may misuse buffers. */
|
|
write_stderr(notfound);
|
|
write_stderr(": not found\n");
|
|
_exit(EXIT_TROUBLE);
|
|
}
|
|
if (pid < 0)
|
|
efaterror("fork");
|
|
# if has_waitpid
|
|
if (waitpid(pid, &wstatus, 0) < 0)
|
|
efaterror("waitpid");
|
|
# else
|
|
{
|
|
pid_t w;
|
|
do {
|
|
if ((w = wait(&wstatus)) < 0)
|
|
efaterror("wait");
|
|
} while (w != pid);
|
|
}
|
|
# endif
|
|
#else
|
|
static struct buf b;
|
|
char const *p;
|
|
|
|
/* Use system(). On many hosts system() discards signals. Yuck! */
|
|
p = args + 1;
|
|
bufscpy(&b, *p);
|
|
while (*++p)
|
|
bufargcat(&b, ' ', *p);
|
|
if (infd != -1 && infd != STDIN_FILENO) {
|
|
char redirection[32];
|
|
VOID sprintf(redirection, "<&%d", infd);
|
|
bufscat(&b, redirection);
|
|
}
|
|
if (outname)
|
|
bufargcat(&b, '>', outname);
|
|
wstatus = system(b.string);
|
|
#endif
|
|
#endif
|
|
}
|
|
if (!WIFEXITED(wstatus)) {
|
|
if (WIFSIGNALED(wstatus)) {
|
|
psignal(WTERMSIG(wstatus), args[1]);
|
|
fatcleanup(1);
|
|
}
|
|
faterror("%s failed for unknown reason", args[1]);
|
|
}
|
|
return WEXITSTATUS(wstatus);
|
|
}
|
|
|
|
#define CARGSMAX 20
|
|
/*
|
|
* Run a command.
|
|
* infd, if not -1, is the input file descriptor.
|
|
* outname, if nonzero, is the name of the output file.
|
|
* The remaining arguments specify the command and its arguments.
|
|
*/
|
|
int
|
|
#if has_prototypes
|
|
run(int infd, char const *outname, ...)
|
|
#else
|
|
/*VARARGS2*/
|
|
run(infd, outname, va_alist)
|
|
int infd;
|
|
char const *outname;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
char const *rgargs[CARGSMAX];
|
|
register int i;
|
|
vararg_start(ap, outname);
|
|
for (i = 1; (rgargs[i++] = va_arg(ap, char const*)); )
|
|
if (CARGSMAX <= i)
|
|
faterror("too many command arguments");
|
|
va_end(ap);
|
|
return runv(infd, outname, rgargs);
|
|
}
|
|
|
|
|
|
int RCSversion;
|
|
|
|
void
|
|
setRCSversion(str)
|
|
char const *str;
|
|
{
|
|
static int oldversion;
|
|
|
|
register char const *s = str + 2;
|
|
|
|
if (*s) {
|
|
int v = VERSION_DEFAULT;
|
|
|
|
if (oldversion)
|
|
redefined('V');
|
|
oldversion = true;
|
|
v = 0;
|
|
while (isdigit(*s))
|
|
v = 10*v + *s++ - '0';
|
|
if (*s)
|
|
error("%s isn't a number", str);
|
|
else if (v < VERSION_min || VERSION_max < v)
|
|
error("%s out of range %d..%d",
|
|
str, VERSION_min, VERSION_max
|
|
);
|
|
|
|
RCSversion = VERSION(v);
|
|
} else {
|
|
printf("RCS version %s\n", RCS_version_string);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
int
|
|
getRCSINIT(argc, argv, newargv)
|
|
int argc;
|
|
char **argv, ***newargv;
|
|
{
|
|
register char *p, *q, **pp;
|
|
char const *ev;
|
|
size_t n;
|
|
|
|
if ((ev = cgetenv("RCSLOCALID")))
|
|
setRCSLocalId(ev);
|
|
|
|
if ((ev = cgetenv("RCSINCEXC")))
|
|
setIncExc(ev);
|
|
|
|
if (!(q = cgetenv("RCSINIT")))
|
|
*newargv = argv;
|
|
else {
|
|
n = argc + 2;
|
|
/*
|
|
* Count spaces in RCSINIT to allocate a new arg vector.
|
|
* This is an upper bound, but it's OK even if too large.
|
|
*/
|
|
for (p = q; ; ) {
|
|
switch (*p++) {
|
|
default:
|
|
continue;
|
|
|
|
case ' ':
|
|
case '\b': case '\f': case '\n':
|
|
case '\r': case '\t': case '\v':
|
|
n++;
|
|
continue;
|
|
|
|
case '\0':
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
*newargv = pp = tnalloc(char*, n);
|
|
*pp++ = *argv++; /* copy program name */
|
|
for (p = q; ; ) {
|
|
for (;;) {
|
|
switch (*q) {
|
|
case '\0':
|
|
goto copyrest;
|
|
|
|
case ' ':
|
|
case '\b': case '\f': case '\n':
|
|
case '\r': case '\t': case '\v':
|
|
q++;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
*pp++ = p;
|
|
++argc;
|
|
for (;;) {
|
|
switch ((*p++ = *q++)) {
|
|
case '\0':
|
|
goto copyrest;
|
|
|
|
case '\\':
|
|
if (!*q)
|
|
goto copyrest;
|
|
p[-1] = *q++;
|
|
continue;
|
|
|
|
default:
|
|
continue;
|
|
|
|
case ' ':
|
|
case '\b': case '\f': case '\n':
|
|
case '\r': case '\t': case '\v':
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
p[-1] = '\0';
|
|
}
|
|
copyrest:
|
|
while ((*pp++ = *argv++))
|
|
continue;
|
|
}
|
|
return argc;
|
|
}
|
|
|
|
|
|
#define cacheid(E) static uid_t i; static int s; if (!s){ s=1; i=(E); } return i
|
|
|
|
#if has_getuid
|
|
uid_t ruid() { cacheid(getuid()); }
|
|
#endif
|
|
#if has_setuid
|
|
uid_t euid() { cacheid(geteuid()); }
|
|
#endif
|
|
|
|
|
|
#if has_setuid
|
|
|
|
/*
|
|
* Setuid execution really works only with Posix 1003.1a Draft 5 seteuid(),
|
|
* because it lets us switch back and forth between arbitrary users.
|
|
* If seteuid() doesn't work, we fall back on setuid(),
|
|
* which works if saved setuid is supported,
|
|
* unless the real or effective user is root.
|
|
* This area is such a mess that we always check switches at runtime.
|
|
*/
|
|
|
|
static void
|
|
#if has_prototypes
|
|
set_uid_to(uid_t u)
|
|
#else
|
|
set_uid_to(u) uid_t u;
|
|
#endif
|
|
/* Become user u. */
|
|
{
|
|
static int looping;
|
|
|
|
if (euid() == ruid())
|
|
return;
|
|
#if (has_fork||has_spawn) && DIFF_ABSOLUTE
|
|
# if has_setreuid
|
|
if (setreuid(u==euid() ? ruid() : euid(), u) != 0)
|
|
efaterror("setuid");
|
|
# else
|
|
if (seteuid(u) != 0)
|
|
efaterror("setuid");
|
|
# endif
|
|
#endif
|
|
if (geteuid() != u) {
|
|
if (looping)
|
|
return;
|
|
looping = true;
|
|
faterror("root setuid not supported" + (u?5:0));
|
|
}
|
|
}
|
|
|
|
static int stick_with_euid;
|
|
|
|
void
|
|
/* Ignore all calls to seteid() and setrid(). */
|
|
nosetid()
|
|
{
|
|
stick_with_euid = true;
|
|
}
|
|
|
|
void
|
|
seteid()
|
|
/* Become effective user. */
|
|
{
|
|
if (!stick_with_euid)
|
|
set_uid_to(euid());
|
|
}
|
|
|
|
void
|
|
setrid()
|
|
/* Become real user. */
|
|
{
|
|
if (!stick_with_euid)
|
|
set_uid_to(ruid());
|
|
}
|
|
#endif
|
|
|
|
time_t
|
|
now()
|
|
{
|
|
static time_t t;
|
|
if (!t && time(&t) == -1)
|
|
efaterror("time");
|
|
return t;
|
|
}
|