1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. DJGPP 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
34 /* Use ECHILD if available, otherwise use EINVAL. */
36 #define PWAIT_ERROR ECHILD
38 #define PWAIT_ERROR EINVAL
41 /* MSDOS doesn't multitask, but for the sake of a consistent interface
42 the code behaves like it does. pexecute runs the program, tucks the
43 exit code away, and returns a "pid". pwait must be called to fetch the
46 /* For communicating information from pexecute to pwait. */
47 static int last_pid
= 0;
48 static int last_status
= 0;
49 static int last_reaped
= 0;
52 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
55 const char *this_pname
;
56 const char *temp_base
;
57 char **errmsg_fmt
, **errmsg_arg
;
66 if ((flags
& PEXECUTE_ONE
) != PEXECUTE_ONE
)
69 /* ??? What are the possible return values from spawnv? */
70 rc
= (flags
& PEXECUTE_SEARCH
? spawnvp
: spawnv
) (P_WAIT
, program
, argv
);
74 *errmsg_fmt
= install_error_msg
;
75 *errmsg_arg
= (char *)program
;
79 /* Tuck the status away for pwait, and return a "pid". */
80 last_status
= rc
<< 8;
85 pwait (pid
, status
, flags
)
90 /* On MSDOS each pexecute must be followed by its associated pwait. */
92 /* Called twice for the same child? */
93 || pid
== last_reaped
)
98 /* ??? Here's an opportunity to canonicalize the values in STATUS.
100 *status
= (last_status
>> 8);
101 last_reaped
= last_pid
;
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