1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Generic MSDOS specialization.
3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
4 Free Software Foundation, Inc.
6 This file is part of the libiberty library.
7 Libiberty is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 Libiberty is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with libiberty; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #include "pex-common.h"
26 #ifdef NEED_DECLARATION_ERRNO
36 #include "safe-ctype.h"
39 /* MSDOS doesn't multitask, but for the sake of a consistent interface
40 the code behaves like it does. pexecute runs the program, tucks the
41 exit code away, and returns a "pid". pwait must be called to fetch the
44 /* For communicating information from pexecute to pwait. */
45 static int last_pid = 0;
46 static int last_status = 0;
47 static int last_reaped = 0;
50 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
53 const char *this_pname;
54 const char *temp_base;
55 char **errmsg_fmt, **errmsg_arg;
61 int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
67 if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
71 temp_base = choose_temp_base ();
72 scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
73 rf = scmd + strlen(program) + 2 + el;
74 sprintf (scmd, "%s%s @%s.gp", program,
75 (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
76 argfile = fopen (rf, "w");
79 int errno_save = errno;
82 *errmsg_fmt = "cannot open `%s.gp'";
83 *errmsg_arg = temp_base;
87 for (i=1; argv[i]; i++)
90 for (cp = argv[i]; *cp; cp++)
92 if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
93 fputc ('\\', argfile);
96 fputc ('\n', argfile);
103 int errno_save = errno;
111 *errmsg_fmt = install_error_msg;
112 *errmsg_arg = (char *)program;
116 /* Tuck the status away for pwait, and return a "pid". */
117 last_status = rc << 8;
121 /* Use ECHILD if available, otherwise use EINVAL. */
123 #define PWAIT_ERROR ECHILD
125 #define PWAIT_ERROR EINVAL
129 pwait (pid, status, flags)
134 /* On MSDOS each pexecute must be followed by its associated pwait. */
136 /* Called twice for the same child? */
137 || pid == last_reaped)
142 /* ??? Here's an opportunity to canonicalize the values in STATUS.
144 *status = last_status;
145 last_reaped = last_pid;