712 lines
15 KiB
C
712 lines
15 KiB
C
/* xqtsub.c
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System dependent functions used only by uuxqt.
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Copyright (C) 1991, 1992, 1993, 1995 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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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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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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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const char xqtsub_rcsid[] = "$Id$";
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#endif
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#include "uudefs.h"
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#include "uuconf.h"
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#include "system.h"
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#include "sysdep.h"
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#include <ctype.h>
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#include <errno.h>
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#define O_WRONLY 1
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#define O_RDWR 2
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#endif
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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#if HAVE_OPENDIR
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#if HAVE_DIRENT_H
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#include <dirent.h>
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#else /* ! HAVE_DIRENT_H */
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#include <sys/dir.h>
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#define dirent direct
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#endif /* ! HAVE_DIRENT_H */
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#endif /* HAVE_OPENDIR */
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/* Get a value for EX_TEMPFAIL. */
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#if HAVE_SYSEXITS_H
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#include <sysexits.h>
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#endif
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#ifndef EX_TEMPFAIL
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#define EX_TEMPFAIL 75
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#endif
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/* Get the full pathname of the command to execute, given the list of
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permitted commands and the allowed path. */
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char *
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zsysdep_find_command (zcmd, pzcmds, pzpath, pferr)
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const char *zcmd;
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char **pzcmds;
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char **pzpath;
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boolean *pferr;
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{
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char **pz;
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struct stat s;
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*pferr = FALSE;
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for (pz = pzcmds; *pz != NULL; pz++)
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{
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char *zslash;
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if (strcmp (*pz, "ALL") == 0)
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break;
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zslash = strrchr (*pz, '/');
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if (zslash != NULL)
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++zslash;
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else
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zslash = *pz;
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if (strcmp (zslash, zcmd) == 0
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|| strcmp (*pz, zcmd) == 0)
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{
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/* If we already have an absolute path, we can get out
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immediately. */
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if (**pz == '/')
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{
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/* Quick error check. */
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if (stat (*pz, &s) != 0)
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{
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ulog (LOG_ERROR, "%s: %s", *pz, strerror (errno));
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*pferr = TRUE;
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return NULL;
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}
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return zbufcpy (*pz);
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}
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break;
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}
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}
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/* If we didn't find this command, get out. */
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if (*pz == NULL)
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return NULL;
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/* We didn't find an absolute pathname, so we must look through
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the path. */
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for (pz = pzpath; *pz != NULL; pz++)
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{
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char *zname;
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zname = zsysdep_in_dir (*pz, zcmd);
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if (stat (zname, &s) == 0)
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return zname;
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}
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return NULL;
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}
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/* Expand a local filename for uuxqt. This is special because uuxqt
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only wants to expand filenames that start with ~ (it does not want
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to prepend the current directory to other names) and if the ~ is
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double, it is turned into a single ~. This returns NULL to
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indicate that no change was required; it has no way to return
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error. */
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char *
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zsysdep_xqt_local_file (qsys, zfile)
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const struct uuconf_system *qsys;
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const char *zfile;
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{
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if (*zfile != '~')
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return NULL;
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if (zfile[1] == '~')
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{
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size_t clen;
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char *zret;
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clen = strlen (zfile);
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zret = zbufalc (clen);
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memcpy (zret, zfile + 1, clen);
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return zret;
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}
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return zsysdep_local_file (zfile, qsys->uuconf_zpubdir,
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(boolean *) NULL);
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}
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#if ! ALLOW_FILENAME_ARGUMENTS
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/* Check to see whether an argument specifies a file name; if it does,
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make sure that the file may legally be sent and/or received. For
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Unix, we do not permit any occurrence of "/../" in the name, nor
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may it start with "../". Otherwise, if it starts with "/" we check
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against the list of permitted files. */
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boolean
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fsysdep_xqt_check_file (qsys, zfile)
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const struct uuconf_system *qsys;
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const char *zfile;
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{
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size_t clen;
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/* Disallow exact "..", prefix "../", suffix "/..", internal "/../",
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and restricted absolute paths. */
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clen = strlen (zfile);
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if ((clen == sizeof ".." - 1
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&& strcmp (zfile, "..") == 0)
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|| strncmp (zfile, "../", sizeof "../" - 1) == 0
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|| (clen >= sizeof "/.." - 1
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&& strcmp (zfile + clen - (sizeof "/.." - 1), "/..") == 0)
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|| strstr (zfile, "/../") != NULL
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|| (*zfile == '/'
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&& (! fin_directory_list (zfile, qsys->uuconf_pzremote_send,
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qsys->uuconf_zpubdir, TRUE, FALSE,
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(const char *) NULL)
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|| ! fin_directory_list (zfile, qsys->uuconf_pzremote_receive,
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qsys->uuconf_zpubdir, TRUE, FALSE,
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(const char *) NULL))))
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{
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ulog (LOG_ERROR, "Not permitted to refer to file \"%s\"", zfile);
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return FALSE;
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}
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return TRUE;
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}
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#endif /* ! ALLOW_FILENAME_ARGUMENTS */
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/* Invoke the command specified by an execute file. */
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/*ARGSUSED*/
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boolean
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fsysdep_execute (qsys, zuser, pazargs, zfullcmd, zinput, zoutput,
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fshell, iseq, pzerror, pftemp)
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const struct uuconf_system *qsys;
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const char *zuser;
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const char **pazargs;
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const char *zfullcmd;
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const char *zinput;
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const char *zoutput;
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boolean fshell;
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int iseq;
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char **pzerror;
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boolean *pftemp;
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{
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int aidescs[3];
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boolean ferr;
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pid_t ipid;
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int ierr;
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char abxqtdir[sizeof XQTDIR + 4];
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const char *zxqtdir;
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int istat;
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char *zpath;
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#if ALLOW_SH_EXECUTION
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const char *azshargs[4];
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#endif
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*pzerror = NULL;
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*pftemp = FALSE;
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aidescs[0] = SPAWN_NULL;
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aidescs[1] = SPAWN_NULL;
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aidescs[2] = SPAWN_NULL;
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ferr = FALSE;
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if (zinput != NULL)
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{
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aidescs[0] = open ((char *) zinput, O_RDONLY | O_NOCTTY, 0);
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if (aidescs[0] < 0)
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{
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ulog (LOG_ERROR, "open (%s): %s", zinput, strerror (errno));
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ferr = TRUE;
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}
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else if (fcntl (aidescs[0], F_SETFD,
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fcntl (aidescs[0], F_GETFD, 0) | FD_CLOEXEC) < 0)
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{
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ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
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ferr = TRUE;
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}
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}
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if (! ferr && zoutput != NULL)
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{
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aidescs[1] = creat ((char *) zoutput, IPRIVATE_FILE_MODE);
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if (aidescs[1] < 0)
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{
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ulog (LOG_ERROR, "creat (%s): %s", zoutput, strerror (errno));
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*pftemp = TRUE;
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ferr = TRUE;
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}
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else if (fcntl (aidescs[1], F_SETFD,
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fcntl (aidescs[1], F_GETFD, 0) | FD_CLOEXEC) < 0)
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{
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ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
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ferr = TRUE;
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}
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}
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if (! ferr)
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{
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*pzerror = zstemp_file (qsys);
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aidescs[2] = creat (*pzerror, IPRIVATE_FILE_MODE);
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if (aidescs[2] < 0)
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{
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if (errno == ENOENT)
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{
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if (! fsysdep_make_dirs (*pzerror, FALSE))
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{
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*pftemp = TRUE;
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ferr = TRUE;
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}
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else
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aidescs[2] = creat (*pzerror, IPRIVATE_FILE_MODE);
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}
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if (! ferr && aidescs[2] < 0)
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{
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ulog (LOG_ERROR, "creat (%s): %s", *pzerror, strerror (errno));
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*pftemp = TRUE;
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ferr = TRUE;
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}
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}
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if (! ferr
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&& fcntl (aidescs[2], F_SETFD,
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fcntl (aidescs[2], F_GETFD, 0) | FD_CLOEXEC) < 0)
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{
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ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
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ferr = TRUE;
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}
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}
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if (iseq == 0)
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zxqtdir = XQTDIR;
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else
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{
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sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
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zxqtdir = abxqtdir;
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}
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if (ferr)
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{
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if (aidescs[0] != SPAWN_NULL)
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(void) close (aidescs[0]);
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if (aidescs[1] != SPAWN_NULL)
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(void) close (aidescs[1]);
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if (aidescs[2] != SPAWN_NULL)
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(void) close (aidescs[2]);
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ubuffree (*pzerror);
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return FALSE;
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}
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#if ALLOW_SH_EXECUTION
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if (fshell)
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{
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azshargs[0] = "/bin/sh";
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azshargs[1] = "-c";
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azshargs[2] = zfullcmd;
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azshargs[3] = NULL;
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pazargs = azshargs;
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}
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#else
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fshell = FALSE;
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#endif
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if (qsys->uuconf_pzpath == NULL)
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zpath = NULL;
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else
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{
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size_t c;
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char **pz;
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c = 0;
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for (pz = qsys->uuconf_pzpath; *pz != NULL; pz++)
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c += strlen (*pz) + 1;
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zpath = zbufalc (c);
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*zpath = '\0';
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for (pz = qsys->uuconf_pzpath; *pz != NULL; pz++)
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{
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strcat (zpath, *pz);
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if (pz[1] != NULL)
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strcat (zpath, ":");
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}
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}
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/* Pass zchdir as zxqtdir, fnosigs as TRUE, fshell as TRUE if we
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aren't already using the shell. */
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ipid = ixsspawn (pazargs, aidescs, TRUE, FALSE, zxqtdir, TRUE,
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! fshell, zpath, qsys->uuconf_zname, zuser);
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ierr = errno;
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ubuffree (zpath);
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if (aidescs[0] != SPAWN_NULL)
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(void) close (aidescs[0]);
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if (aidescs[1] != SPAWN_NULL)
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(void) close (aidescs[1]);
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if (aidescs[2] != SPAWN_NULL)
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(void) close (aidescs[2]);
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if (ipid < 0)
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{
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ulog (LOG_ERROR, "ixsspawn: %s", strerror (ierr));
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*pftemp = TRUE;
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return FALSE;
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}
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istat = ixswait ((unsigned long) ipid, "Execution");
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if (istat == EX_TEMPFAIL)
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*pftemp = TRUE;
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return istat == 0;
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}
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/* Lock a uuxqt process. */
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int
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ixsysdep_lock_uuxqt (zcmd, cmaxuuxqts)
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const char *zcmd;
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int cmaxuuxqts;
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{
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char ab[sizeof "LCK.XQT.9999"];
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int i;
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if (cmaxuuxqts <= 0 || cmaxuuxqts >= 10000)
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cmaxuuxqts = 9999;
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for (i = 0; i < cmaxuuxqts; i++)
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{
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sprintf (ab, "LCK.XQT.%d", i);
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if (fsdo_lock (ab, TRUE, (boolean *) NULL))
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break;
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}
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if (i >= cmaxuuxqts)
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return -1;
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if (zcmd != NULL)
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{
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char abcmd[sizeof "LXQ.123456789"];
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sprintf (abcmd, "LXQ.%.9s", zcmd);
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abcmd[strcspn (abcmd, " \t/")] = '\0';
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if (! fsdo_lock (abcmd, TRUE, (boolean *) NULL))
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{
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(void) fsdo_unlock (ab, TRUE);
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return -1;
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}
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}
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return i;
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}
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/* Unlock a uuxqt process. */
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boolean
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fsysdep_unlock_uuxqt (iseq, zcmd, cmaxuuxqts)
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int iseq;
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const char *zcmd;
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int cmaxuuxqts;
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{
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char ab[sizeof "LCK.XQT.9999"];
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boolean fret;
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fret = TRUE;
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sprintf (ab, "LCK.XQT.%d", iseq);
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if (! fsdo_unlock (ab, TRUE))
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fret = FALSE;
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if (zcmd != NULL)
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{
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char abcmd[sizeof "LXQ.123456789"];
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sprintf (abcmd, "LXQ.%.9s", zcmd);
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abcmd[strcspn (abcmd, " \t/")] = '\0';
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if (! fsdo_unlock (abcmd, TRUE))
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fret = FALSE;
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}
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return fret;
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}
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/* See whether a particular uuxqt command is locked (this depends on
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the implementation of fsdo_lock). */
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boolean
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fsysdep_uuxqt_locked (zcmd)
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const char *zcmd;
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{
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char ab[sizeof "LXQ.123456789"];
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struct stat s;
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sprintf (ab, "LXQ.%.9s", zcmd);
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return stat (ab, &s) == 0;
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}
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/* Lock a particular execute file. */
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boolean
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fsysdep_lock_uuxqt_file (zfile)
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const char *zfile;
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{
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char *zcopy, *z;
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boolean fret;
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zcopy = zbufcpy (zfile);
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z = strrchr (zcopy, '/');
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if (z == NULL)
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*zcopy = 'L';
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else
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*(z + 1) = 'L';
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fret = fsdo_lock (zcopy, TRUE, (boolean *) NULL);
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ubuffree (zcopy);
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return fret;
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}
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/* Unlock a particular execute file. */
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boolean
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fsysdep_unlock_uuxqt_file (zfile)
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const char *zfile;
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{
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char *zcopy, *z;
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boolean fret;
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zcopy = zbufcpy (zfile);
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z = strrchr (zcopy, '/');
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if (z == NULL)
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*zcopy = 'L';
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else
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*(z + 1) = 'L';
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fret = fsdo_unlock (zcopy, TRUE);
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ubuffree (zcopy);
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return fret;
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}
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/* Lock the execute directory. Since we use a different directory
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depending on which LCK.XQT.dddd file we got, there is actually no
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need to create a lock file. We do make sure that the directory
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exists, though. */
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boolean
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fsysdep_lock_uuxqt_dir (iseq)
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int iseq;
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{
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const char *zxqtdir;
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char abxqtdir[sizeof XQTDIR + 4];
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if (iseq == 0)
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zxqtdir = XQTDIR;
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else
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{
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sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
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zxqtdir = abxqtdir;
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}
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if (mkdir (zxqtdir, S_IRWXU) < 0
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&& errno != EEXIST
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&& errno != EISDIR)
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{
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ulog (LOG_ERROR, "mkdir (%s): %s", zxqtdir, strerror (errno));
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return FALSE;
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}
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||
return TRUE;
|
||
}
|
||
|
||
/* Unlock the execute directory and clear it out. The lock is
|
||
actually the LCK.XQT.dddd file, so we don't unlock it, but we do
|
||
remove all the files. */
|
||
|
||
boolean
|
||
fsysdep_unlock_uuxqt_dir (iseq)
|
||
int iseq;
|
||
{
|
||
const char *zxqtdir;
|
||
char abxqtdir[sizeof XQTDIR + 4];
|
||
DIR *qdir;
|
||
|
||
if (iseq == 0)
|
||
zxqtdir = XQTDIR;
|
||
else
|
||
{
|
||
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
|
||
zxqtdir = abxqtdir;
|
||
}
|
||
|
||
qdir = opendir ((char *) zxqtdir);
|
||
if (qdir != NULL)
|
||
{
|
||
struct dirent *qentry;
|
||
|
||
while ((qentry = readdir (qdir)) != NULL)
|
||
{
|
||
char *z;
|
||
|
||
if (strcmp (qentry->d_name, ".") == 0
|
||
|| strcmp (qentry->d_name, "..") == 0)
|
||
continue;
|
||
z = zsysdep_in_dir (zxqtdir, qentry->d_name);
|
||
if (remove (z) < 0)
|
||
{
|
||
int ierr;
|
||
|
||
ierr = errno;
|
||
if (! fsysdep_directory (z))
|
||
ulog (LOG_ERROR, "remove (%s): %s", z,
|
||
strerror (ierr));
|
||
else
|
||
(void) fsysdep_rmdir (z);
|
||
}
|
||
ubuffree (z);
|
||
}
|
||
|
||
closedir (qdir);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Move files into the execution directory. */
|
||
|
||
boolean
|
||
fsysdep_move_uuxqt_files (cfiles, pzfrom, pzto, fto, iseq, pzinput)
|
||
int cfiles;
|
||
const char *const *pzfrom;
|
||
const char *const *pzto;
|
||
boolean fto;
|
||
int iseq;
|
||
char **pzinput;
|
||
{
|
||
char *zinput;
|
||
const char *zxqtdir;
|
||
char abxqtdir[sizeof XQTDIR + 4];
|
||
int i;
|
||
|
||
if (pzinput == NULL)
|
||
zinput = NULL;
|
||
else
|
||
zinput = *pzinput;
|
||
|
||
if (iseq == 0)
|
||
zxqtdir = XQTDIR;
|
||
else
|
||
{
|
||
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
|
||
zxqtdir = abxqtdir;
|
||
}
|
||
|
||
for (i = 0; i < cfiles; i++)
|
||
{
|
||
const char *zfrom, *zto;
|
||
char *zfree;
|
||
|
||
if (pzto[i] == NULL)
|
||
continue;
|
||
|
||
zfree = zsysdep_in_dir (zxqtdir, pzto[i]);
|
||
|
||
zfrom = pzfrom[i];
|
||
zto = zfree;
|
||
|
||
if (zinput != NULL && strcmp (zinput, zfrom) == 0)
|
||
{
|
||
*pzinput = zbufcpy (zto);
|
||
zinput = NULL;
|
||
}
|
||
|
||
if (! fto)
|
||
{
|
||
const char *ztemp;
|
||
|
||
ztemp = zfrom;
|
||
zfrom = zto;
|
||
zto = ztemp;
|
||
(void) chmod (zfrom, IPRIVATE_FILE_MODE);
|
||
}
|
||
|
||
if (rename (zfrom, zto) < 0)
|
||
{
|
||
#if HAVE_RENAME
|
||
/* On some systems the system call rename seems to fail for
|
||
arbitrary reasons. To get around this, we always try to
|
||
copy the file by hand if the rename failed. */
|
||
errno = EXDEV;
|
||
#endif
|
||
|
||
if (errno != EXDEV)
|
||
{
|
||
ulog (LOG_ERROR, "rename (%s, %s): %s", zfrom, zto,
|
||
strerror (errno));
|
||
ubuffree (zfree);
|
||
break;
|
||
}
|
||
|
||
if (! fcopy_file (zfrom, zto, FALSE, FALSE, FALSE))
|
||
{
|
||
ubuffree (zfree);
|
||
break;
|
||
}
|
||
if (remove (zfrom) < 0)
|
||
ulog (LOG_ERROR, "remove (%s): %s", zfrom,
|
||
strerror (errno));
|
||
}
|
||
|
||
if (fto)
|
||
(void) chmod (zto, IPUBLIC_FILE_MODE);
|
||
|
||
ubuffree (zfree);
|
||
}
|
||
|
||
if (i < cfiles)
|
||
{
|
||
if (fto)
|
||
(void) fsysdep_move_uuxqt_files (i, pzfrom, pzto, FALSE, iseq,
|
||
(char **) NULL);
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|