1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Generic Win32 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"
30 #ifdef HAVE_SYS_WAIT_H
39 /* mingw32 headers may not define the following. */
49 # define WAIT_GRANDCHILD 1
52 /* This is a kludge to get around the Microsoft C spawn functions' propensity
53 to remove the outermost set of double quotes from all arguments. */
55 static const char * const *
61 for (i
= 1; argvec
[i
] != 0; i
++)
68 for (j
= 0; j
< len
; j
++)
72 newtemp
= xmalloc (len
+ 2);
73 strncpy (newtemp
, temp
, j
);
75 strncpy (&newtemp
[j
+1], &temp
[j
], len
-j
);
86 for (i
= 0; argvec
[i
] != 0; i
++)
88 if (strpbrk (argvec
[i
], " \t"))
90 int len
, trailing_backslash
;
93 len
= strlen (argvec
[i
]);
94 trailing_backslash
= 0;
96 /* There is an added complication when an arg with embedded white
97 space ends in a backslash (such as in the case of -iprefix arg
98 passed to cpp). The resulting quoted strings gets misinterpreted
99 by the command interpreter -- it thinks that the ending quote
100 is escaped by the trailing backslash and things get confused.
101 We handle this case by escaping the trailing backslash, provided
102 it was not escaped in the first place. */
104 && argvec
[i
][len
-1] == '\\'
105 && argvec
[i
][len
-2] != '\\')
107 trailing_backslash
= 1;
108 ++len
; /* to escape the final backslash. */
111 len
+= 2; /* and for the enclosing quotes. */
113 temp
= xmalloc (len
+ 1);
115 strcpy (temp
+ 1, argvec
[i
]);
116 if (trailing_backslash
)
125 return (const char * const *) argvec
;
128 /* Win32 supports pipes */
130 pexecute (program
, argv
, this_pname
, temp_base
, errmsg_fmt
, errmsg_arg
, flags
)
133 const char *this_pname
;
134 const char *temp_base
;
135 char **errmsg_fmt
, **errmsg_arg
;
139 int pdes
[2], org_stdin
, org_stdout
;
140 int input_desc
, output_desc
;
141 int retries
, sleep_interval
;
143 /* Pipe waiting from last process, to be used as input for the next one.
144 Value is STDIN_FILE_NO if no pipe is waiting
145 (i.e. the next command is the first of a group). */
146 static int last_pipe_input
;
148 /* If this is the first process, initialize. */
149 if (flags
& PEXECUTE_FIRST
)
150 last_pipe_input
= STDIN_FILE_NO
;
152 input_desc
= last_pipe_input
;
154 /* If this isn't the last process, make a pipe for its output,
155 and record it as waiting to be the input to the next process. */
156 if (! (flags
& PEXECUTE_LAST
))
158 if (_pipe (pdes
, 256, O_BINARY
) < 0)
160 *errmsg_fmt
= "pipe";
164 output_desc
= pdes
[WRITE_PORT
];
165 last_pipe_input
= pdes
[READ_PORT
];
170 output_desc
= STDOUT_FILE_NO
;
171 last_pipe_input
= STDIN_FILE_NO
;
174 if (input_desc
!= STDIN_FILE_NO
)
176 org_stdin
= dup (STDIN_FILE_NO
);
177 dup2 (input_desc
, STDIN_FILE_NO
);
181 if (output_desc
!= STDOUT_FILE_NO
)
183 org_stdout
= dup (STDOUT_FILE_NO
);
184 dup2 (output_desc
, STDOUT_FILE_NO
);
188 pid
= (flags
& PEXECUTE_SEARCH
? _spawnvp
: _spawnv
)
189 (_P_NOWAIT
, program
, fix_argv(argv
));
191 if (input_desc
!= STDIN_FILE_NO
)
193 dup2 (org_stdin
, STDIN_FILE_NO
);
197 if (output_desc
!= STDOUT_FILE_NO
)
199 dup2 (org_stdout
, STDOUT_FILE_NO
);
205 *errmsg_fmt
= install_error_msg
;
206 *errmsg_arg
= program
;
213 /* MS CRTDLL doesn't return enough information in status to decide if the
214 child exited due to a signal or not, rather it simply returns an
215 integer with the exit code of the child; eg., if the child exited with
216 an abort() call and didn't have a handler for SIGABRT, it simply returns
217 with status = 3. We fix the status code to conform to the usual WIF*
218 macros. Note that WIFSIGNALED will never be true under CRTDLL. */
221 pwait (pid
, status
, flags
)
228 pid
= _cwait (&termstat
, pid
, WAIT_CHILD
);
230 /* ??? Here's an opportunity to canonicalize the values in STATUS.
233 /* cwait returns the child process exit code in termstat.
234 A value of 3 indicates that the child caught a signal, but not
235 which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
240 *status
= (((termstat
) & 0xff) << 8);
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