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git.ipfire.org Git - thirdparty/gcc.git/blob - libiberty/pex-cygwin.c
1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Cygwin 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"
27 #ifdef HAVE_SYS_WAIT_H
36 extern int _spawnv ();
37 extern int _spawnvp ();
39 /* Win32 supports pipes, and Cygwin provides waitpid. */
42 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
45 const char *this_pname
;
46 const char *temp_base
;
47 char **errmsg_fmt
, **errmsg_arg
;
51 int pdes
[2], org_stdin
, org_stdout
;
52 int input_desc
, output_desc
;
53 int retries
, sleep_interval
;
55 /* Pipe waiting from last process, to be used as input for the next one.
56 Value is STDIN_FILE_NO if no pipe is waiting
57 (i.e. the next command is the first of a group). */
58 static int last_pipe_input
;
60 /* If this is the first process, initialize. */
61 if (flags
& PEXECUTE_FIRST
)
62 last_pipe_input
= STDIN_FILE_NO
;
64 input_desc
= last_pipe_input
;
66 /* If this isn't the last process, make a pipe for its output,
67 and record it as waiting to be the input to the next process. */
68 if (! (flags
& PEXECUTE_LAST
))
70 if (_pipe (pdes
, 256, O_BINARY
) < 0)
76 output_desc
= pdes
[WRITE_PORT
];
77 last_pipe_input
= pdes
[READ_PORT
];
82 output_desc
= STDOUT_FILE_NO
;
83 last_pipe_input
= STDIN_FILE_NO
;
86 if (input_desc
!= STDIN_FILE_NO
)
88 org_stdin
= dup (STDIN_FILE_NO
);
89 dup2 (input_desc
, STDIN_FILE_NO
);
93 if (output_desc
!= STDOUT_FILE_NO
)
95 org_stdout
= dup (STDOUT_FILE_NO
);
96 dup2 (output_desc
, STDOUT_FILE_NO
);
100 pid
= (flags
& PEXECUTE_SEARCH
? _spawnvp
: _spawnv
)
101 (_P_NOWAIT
, program
, argv
);
103 if (input_desc
!= STDIN_FILE_NO
)
105 dup2 (org_stdin
, STDIN_FILE_NO
);
109 if (output_desc
!= STDOUT_FILE_NO
)
111 dup2 (org_stdout
, STDOUT_FILE_NO
);
117 *errmsg_fmt
= install_error_msg
;
118 *errmsg_arg
= program
;
126 pwait (pid
, status
, flags
)
129 int flags ATTRIBUTE_UNUSED
;
131 return waitpid (pid
, status
, 0);