737 lines
18 KiB
C
737 lines
18 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
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with other subprocesses), and wait for it.
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Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file exports two functions: pexecute and pwait. */
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/* This file lives in at least two places: libiberty and gcc.
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Don't change one without the other. */
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/* $FreeBSD$ */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#define ISSPACE (x) isspace(x)
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef vfork /* Autoconf may define this to fork for us. */
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# define VFORK_STRING "fork"
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#else
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# define VFORK_STRING "vfork"
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#endif
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#ifdef HAVE_VFORK_H
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#include <vfork.h>
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#endif
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#ifdef VMS
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#define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
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lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
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#endif /* VMS */
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#include "libiberty.h"
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/* stdin file number. */
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#define STDIN_FILE_NO 0
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/* stdout file number. */
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#define STDOUT_FILE_NO 1
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/* value of `pipe': port index for reading. */
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#define READ_PORT 0
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/* value of `pipe': port index for writing. */
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#define WRITE_PORT 1
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static char *install_error_msg = "installation problem, cannot exec `%s'";
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/* pexecute: execute a program.
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PROGRAM and ARGV are the arguments to execv/execvp.
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THIS_PNAME is name of the calling program (i.e. argv[0]).
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TEMP_BASE is the path name, sans suffix, of a temporary file to use
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if needed. This is currently only needed for MSDOS ports that don't use
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GO32 (do any still exist?). Ports that don't need it can pass NULL.
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(FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched
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(??? It's not clear that GCC passes this flag correctly).
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(FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain.
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(FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain.
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FIRST_LAST could be simplified to only mark the last of a chain of processes
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but that requires the caller to always mark the last one (and not give up
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early if some error occurs). It's more robust to require the caller to
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mark both ends of the chain.
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The result is the pid on systems like Unix where we fork/exec and on systems
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like WIN32 and OS2 where we use spawn. It is up to the caller to wait for
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the child.
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The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
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for the child here.
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Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error
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message with an optional argument (if not needed, ERRMSG_ARG is set to
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NULL), and -1 is returned. `errno' is available to the caller to use.
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pwait: cover function for wait.
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PID is the process id of the task to wait for.
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STATUS is the `status' argument to wait.
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FLAGS is currently unused (allows future enhancement without breaking
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upward compatibility). Pass 0 for now.
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The result is the pid of the child reaped,
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or -1 for failure (errno says why).
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On systems that don't support waiting for a particular child, PID is
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ignored. On systems like MSDOS that don't really multitask pwait
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is just a mechanism to provide a consistent interface for the caller.
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pfinish: finish generation of script
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pfinish is necessary for systems like MPW where a script is generated that
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runs the requested programs.
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*/
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#ifdef __MSDOS__
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/* MSDOS doesn't multitask, but for the sake of a consistent interface
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the code behaves like it does. pexecute runs the program, tucks the
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exit code away, and returns a "pid". pwait must be called to fetch the
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exit code. */
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#include <process.h>
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/* For communicating information from pexecute to pwait. */
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static int last_pid = 0;
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static int last_status = 0;
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static int last_reaped = 0;
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname;
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const char *temp_base;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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int rc;
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last_pid++;
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if (last_pid < 0)
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last_pid = 1;
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if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
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abort ();
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#ifdef __GO32__
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/* ??? What are the possible return values from spawnv? */
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rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
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#else
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char *scmd, *rf;
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FILE *argfile;
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int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
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scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
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rf = scmd + strlen(program) + 2 + el;
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sprintf (scmd, "%s%s @%s.gp", program,
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(flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
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argfile = fopen (rf, "w");
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if (argfile == 0)
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{
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int errno_save = errno;
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free (scmd);
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errno = errno_save;
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*errmsg_fmt = "cannot open `%s.gp'";
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*errmsg_arg = temp_base;
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return -1;
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}
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for (i=1; argv[i]; i++)
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{
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char *cp;
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for (cp = argv[i]; *cp; cp++)
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{
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if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
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fputc ('\\', argfile);
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fputc (*cp, argfile);
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}
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fputc ('\n', argfile);
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}
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fclose (argfile);
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rc = system (scmd);
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{
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int errno_save = errno;
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remove (rf);
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free (scmd);
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errno = errno_save;
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}
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#endif
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if (rc == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = program;
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return -1;
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}
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/* Tuck the status away for pwait, and return a "pid". */
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last_status = rc << 8;
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return last_pid;
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}
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int
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pwait (pid, status, flags)
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int pid;
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int *status;
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int flags;
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{
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/* On MSDOS each pexecute must be followed by it's associated pwait. */
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if (pid != last_pid
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/* Called twice for the same child? */
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|| pid == last_reaped)
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{
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/* ??? ECHILD would be a better choice. Can we use it here? */
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errno = EINVAL;
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return -1;
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}
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/* ??? Here's an opportunity to canonicalize the values in STATUS.
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Needed? */
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*status = last_status;
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last_reaped = last_pid;
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return last_pid;
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}
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#endif /* MSDOS */
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#if defined (_WIN32) && ! defined (_UWIN)
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#include <process.h>
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#ifdef __CYGWIN__
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#define fix_argv(argvec) (argvec)
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extern int _spawnv ();
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extern int _spawnvp ();
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#else /* ! __CYGWIN__ */
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/* This is a kludge to get around the Microsoft C spawn functions' propensity
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to remove the outermost set of double quotes from all arguments. */
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const char * const *
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fix_argv (argvec)
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char **argvec;
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{
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int i;
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for (i = 1; argvec[i] != 0; i++)
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{
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int len, j;
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char *temp, *newtemp;
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temp = argvec[i];
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len = strlen (temp);
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for (j = 0; j < len; j++)
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{
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if (temp[j] == '"')
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{
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newtemp = xmalloc (len + 2);
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strncpy (newtemp, temp, j);
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newtemp [j] = '\\';
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strncpy (&newtemp [j+1], &temp [j], len-j);
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newtemp [len+1] = 0;
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temp = newtemp;
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len++;
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j++;
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}
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}
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argvec[i] = temp;
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}
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return (const char * const *) argvec;
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}
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#endif /* __CYGWIN__ */
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#include <io.h>
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#include <fcntl.h>
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#include <signal.h>
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/* mingw32 headers may not define the following. */
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#ifndef _P_WAIT
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# define _P_WAIT 0
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# define _P_NOWAIT 1
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# define _P_OVERLAY 2
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# define _P_NOWAITO 3
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# define _P_DETACH 4
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# define WAIT_CHILD 0
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# define WAIT_GRANDCHILD 1
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#endif
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/* Win32 supports pipes */
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname;
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const char *temp_base;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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int pid;
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int pdes[2], org_stdin, org_stdout;
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int input_desc, output_desc;
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int retries, sleep_interval;
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/* Pipe waiting from last process, to be used as input for the next one.
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Value is STDIN_FILE_NO if no pipe is waiting
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(i.e. the next command is the first of a group). */
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static int last_pipe_input;
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/* If this is the first process, initialize. */
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if (flags & PEXECUTE_FIRST)
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last_pipe_input = STDIN_FILE_NO;
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input_desc = last_pipe_input;
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/* If this isn't the last process, make a pipe for its output,
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and record it as waiting to be the input to the next process. */
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if (! (flags & PEXECUTE_LAST))
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{
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if (_pipe (pdes, 256, O_BINARY) < 0)
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{
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*errmsg_fmt = "pipe";
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*errmsg_arg = NULL;
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return -1;
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}
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output_desc = pdes[WRITE_PORT];
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last_pipe_input = pdes[READ_PORT];
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}
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else
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{
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/* Last process. */
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output_desc = STDOUT_FILE_NO;
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last_pipe_input = STDIN_FILE_NO;
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}
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if (input_desc != STDIN_FILE_NO)
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{
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org_stdin = dup (STDIN_FILE_NO);
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dup2 (input_desc, STDIN_FILE_NO);
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close (input_desc);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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org_stdout = dup (STDOUT_FILE_NO);
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dup2 (output_desc, STDOUT_FILE_NO);
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close (output_desc);
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}
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pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
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(_P_NOWAIT, program, fix_argv(argv));
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if (input_desc != STDIN_FILE_NO)
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{
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dup2 (org_stdin, STDIN_FILE_NO);
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close (org_stdin);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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dup2 (org_stdout, STDOUT_FILE_NO);
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close (org_stdout);
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}
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if (pid == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = program;
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return -1;
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}
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return pid;
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}
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/* MS CRTDLL doesn't return enough information in status to decide if the
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child exited due to a signal or not, rather it simply returns an
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integer with the exit code of the child; eg., if the child exited with
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an abort() call and didn't have a handler for SIGABRT, it simply returns
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with status = 3. We fix the status code to conform to the usual WIF*
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macros. Note that WIFSIGNALED will never be true under CRTDLL. */
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int
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pwait (pid, status, flags)
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int pid;
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int *status;
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int flags;
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{
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#ifdef __CYGWIN__
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return wait (status);
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#else
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int termstat;
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pid = _cwait (&termstat, pid, WAIT_CHILD);
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/* ??? Here's an opportunity to canonicalize the values in STATUS.
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Needed? */
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/* cwait returns the child process exit code in termstat.
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A value of 3 indicates that the child caught a signal, but not
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which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
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report SIGABRT. */
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if (termstat == 3)
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*status = SIGABRT;
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else
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*status = (((termstat) & 0xff) << 8);
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return pid;
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#endif /* __CYGWIN__ */
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}
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#endif /* _WIN32 && ! _UWIN */
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#ifdef OS2
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/* ??? Does OS2 have process.h? */
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extern int spawnv ();
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extern int spawnvp ();
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname;
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const char *temp_base;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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int pid;
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if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
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abort ();
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/* ??? Presumably 1 == _P_NOWAIT. */
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pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
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if (pid == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = program;
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return -1;
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}
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return pid;
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}
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int
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pwait (pid, status, flags)
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int pid;
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int *status;
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int flags;
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{
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/* ??? Here's an opportunity to canonicalize the values in STATUS.
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Needed? */
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int pid = wait (status);
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return pid;
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}
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#endif /* OS2 */
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#ifdef MPW
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/* MPW pexecute doesn't actually run anything; instead, it writes out
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script commands that, when run, will do the actual executing.
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For example, in GCC's case, GCC will write out several script commands:
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cpp ...
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cc1 ...
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as ...
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ld ...
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and then exit. None of the above programs will have run yet. The task
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that called GCC will then execute the script and cause cpp,etc. to run.
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The caller must invoke pfinish before calling exit. This adds
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the finishing touches to the generated script. */
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static int first_time = 1;
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname;
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const char *temp_base;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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char tmpprogram[255];
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char *cp, *tmpname;
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int i;
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mpwify_filename (program, tmpprogram);
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if (first_time)
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{
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printf ("Set Failed 0\n");
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first_time = 0;
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}
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fputs ("If {Failed} == 0\n", stdout);
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/* If being verbose, output a copy of the command. It should be
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accurate enough and escaped enough to be "clickable". */
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if (flags & PEXECUTE_VERBOSE)
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{
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fputs ("\tEcho ", stdout);
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fputc ('\'', stdout);
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fputs (tmpprogram, stdout);
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fputc ('\'', stdout);
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fputc (' ', stdout);
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for (i=1; argv[i]; i++)
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{
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fputc ('\'', stdout);
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/* See if we have an argument that needs fixing. */
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if (strchr(argv[i], '/'))
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{
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tmpname = (char *) xmalloc (256);
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mpwify_filename (argv[i], tmpname);
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argv[i] = tmpname;
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}
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for (cp = argv[i]; *cp; cp++)
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{
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/* Write an Option-d escape char in front of special chars. */
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if (strchr("'+", *cp))
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fputc ('\266', stdout);
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fputc (*cp, stdout);
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}
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fputc ('\'', stdout);
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fputc (' ', stdout);
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}
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fputs ("\n", stdout);
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}
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fputs ("\t", stdout);
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fputs (tmpprogram, stdout);
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fputc (' ', stdout);
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for (i=1; argv[i]; i++)
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{
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/* See if we have an argument that needs fixing. */
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if (strchr(argv[i], '/'))
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{
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tmpname = (char *) xmalloc (256);
|
|
mpwify_filename (argv[i], tmpname);
|
|
argv[i] = tmpname;
|
|
}
|
|
if (strchr (argv[i], ' '))
|
|
fputc ('\'', stdout);
|
|
for (cp = argv[i]; *cp; cp++)
|
|
{
|
|
/* Write an Option-d escape char in front of special chars. */
|
|
if (strchr("'+", *cp))
|
|
fputc ('\266', stdout);
|
|
fputc (*cp, stdout);
|
|
}
|
|
if (strchr (argv[i], ' '))
|
|
fputc ('\'', stdout);
|
|
fputc (' ', stdout);
|
|
}
|
|
|
|
fputs ("\n", stdout);
|
|
|
|
/* Output commands that arrange to clean up and exit if a failure occurs.
|
|
We have to be careful to collect the status from the program that was
|
|
run, rather than some other script command. Also, we don't exit
|
|
immediately, since necessary cleanups are at the end of the script. */
|
|
fputs ("\tSet TmpStatus {Status}\n", stdout);
|
|
fputs ("\tIf {TmpStatus} != 0\n", stdout);
|
|
fputs ("\t\tSet Failed {TmpStatus}\n", stdout);
|
|
fputs ("\tEnd\n", stdout);
|
|
fputs ("End\n", stdout);
|
|
|
|
/* We're just composing a script, can't fail here. */
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pwait (pid, status, flags)
|
|
int pid;
|
|
int *status;
|
|
int flags;
|
|
{
|
|
*status = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Write out commands that will exit with the correct error code
|
|
if something in the script failed. */
|
|
|
|
void
|
|
pfinish ()
|
|
{
|
|
printf ("\tExit \"{Failed}\"\n");
|
|
}
|
|
|
|
#endif /* MPW */
|
|
|
|
/* include for Unix-like environments but not for Dos-like environments */
|
|
#if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \
|
|
&& ! (defined (_WIN32) && ! defined (_UWIN))
|
|
|
|
extern int execv ();
|
|
extern int execvp ();
|
|
|
|
int
|
|
pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
|
|
const char *program;
|
|
char * const *argv;
|
|
const char *this_pname;
|
|
const char *temp_base;
|
|
char **errmsg_fmt, **errmsg_arg;
|
|
int flags;
|
|
{
|
|
int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv);
|
|
int pid;
|
|
int pdes[2];
|
|
int input_desc, output_desc;
|
|
int retries, sleep_interval;
|
|
/* Pipe waiting from last process, to be used as input for the next one.
|
|
Value is STDIN_FILE_NO if no pipe is waiting
|
|
(i.e. the next command is the first of a group). */
|
|
static int last_pipe_input;
|
|
|
|
/* If this is the first process, initialize. */
|
|
if (flags & PEXECUTE_FIRST)
|
|
last_pipe_input = STDIN_FILE_NO;
|
|
|
|
input_desc = last_pipe_input;
|
|
|
|
/* If this isn't the last process, make a pipe for its output,
|
|
and record it as waiting to be the input to the next process. */
|
|
if (! (flags & PEXECUTE_LAST))
|
|
{
|
|
if (pipe (pdes) < 0)
|
|
{
|
|
*errmsg_fmt = "pipe";
|
|
*errmsg_arg = NULL;
|
|
return -1;
|
|
}
|
|
output_desc = pdes[WRITE_PORT];
|
|
last_pipe_input = pdes[READ_PORT];
|
|
}
|
|
else
|
|
{
|
|
/* Last process. */
|
|
output_desc = STDOUT_FILE_NO;
|
|
last_pipe_input = STDIN_FILE_NO;
|
|
}
|
|
|
|
/* Fork a subprocess; wait and retry if it fails. */
|
|
sleep_interval = 1;
|
|
for (retries = 0; retries < 4; retries++)
|
|
{
|
|
pid = vfork ();
|
|
if (pid >= 0)
|
|
break;
|
|
sleep (sleep_interval);
|
|
sleep_interval *= 2;
|
|
}
|
|
|
|
switch (pid)
|
|
{
|
|
case -1:
|
|
{
|
|
*errmsg_fmt = VFORK_STRING;
|
|
*errmsg_arg = NULL;
|
|
return -1;
|
|
}
|
|
|
|
case 0: /* child */
|
|
/* Move the input and output pipes into place, if necessary. */
|
|
if (input_desc != STDIN_FILE_NO)
|
|
{
|
|
close (STDIN_FILE_NO);
|
|
dup (input_desc);
|
|
close (input_desc);
|
|
}
|
|
if (output_desc != STDOUT_FILE_NO)
|
|
{
|
|
close (STDOUT_FILE_NO);
|
|
dup (output_desc);
|
|
close (output_desc);
|
|
}
|
|
|
|
/* Close the parent's descs that aren't wanted here. */
|
|
if (last_pipe_input != STDIN_FILE_NO)
|
|
close (last_pipe_input);
|
|
|
|
/* Exec the program. */
|
|
(*func) (program, argv);
|
|
|
|
/* Note: Calling fprintf and exit here doesn't seem right for vfork. */
|
|
fprintf (stderr, "%s: ", this_pname);
|
|
fprintf (stderr, install_error_msg, program);
|
|
fprintf (stderr, ": %s\n", xstrerror (errno));
|
|
_exit (1);
|
|
/* NOTREACHED */
|
|
return 0;
|
|
|
|
default:
|
|
/* In the parent, after forking.
|
|
Close the descriptors that we made for this child. */
|
|
if (input_desc != STDIN_FILE_NO)
|
|
close (input_desc);
|
|
if (output_desc != STDOUT_FILE_NO)
|
|
close (output_desc);
|
|
|
|
/* Return child's process number. */
|
|
return pid;
|
|
}
|
|
}
|
|
|
|
int
|
|
pwait (pid, status, flags)
|
|
int pid;
|
|
int *status;
|
|
int flags;
|
|
{
|
|
/* ??? Here's an opportunity to canonicalize the values in STATUS.
|
|
Needed? */
|
|
#ifdef VMS
|
|
pid = waitpid (-1, status, 0);
|
|
#else
|
|
pid = wait (status);
|
|
#endif
|
|
return pid;
|
|
}
|
|
|
|
#endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! (_WIN32 && ! _UWIN) */
|