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[binutils.git] / libiberty / pex-common.h
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1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Shared logic.
3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004
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., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 #ifndef PEX_COMMON_H
23 #define PEX_COMMON_H
25 #include "config.h"
26 #include "libiberty.h"
27 #include <stdio.h>
29 #define install_error_msg "installation problem, cannot exec `%s'"
31 /* stdin file number. */
32 #define STDIN_FILE_NO 0
34 /* stdout file number. */
35 #define STDOUT_FILE_NO 1
37 /* stderr file number. */
38 #define STDERR_FILE_NO 2
40 /* value of `pipe': port index for reading. */
41 #define READ_PORT 0
43 /* value of `pipe': port index for writing. */
44 #define WRITE_PORT 1
46 /* The structure used by pex_init and friends. */
48 struct pex_obj
50 /* Flags. */
51 int flags;
52 /* Name of calling program, for error messages. */
53 const char *pname;
54 /* Base name to use for temporary files. */
55 const char *tempbase;
56 /* Pipe to use as stdin for next process. */
57 int next_input;
58 /* File name to use as stdin for next process. */
59 char *next_input_name;
60 /* Whether next_input_name was allocated using malloc. */
61 int next_input_name_allocated;
62 /* If not -1, stderr pipe from the last process. */
63 int stderr_pipe;
64 /* Number of child processes. */
65 int count;
66 /* PIDs of child processes; array allocated using malloc. */
67 long *children;
68 /* Exit statuses of child processes; array allocated using malloc. */
69 int *status;
70 /* Time used by child processes; array allocated using malloc. */
71 struct pex_time *time;
72 /* Number of children we have already waited for. */
73 int number_waited;
74 /* FILE created by pex_input_file. */
75 FILE *input_file;
76 /* FILE created by pex_read_output. */
77 FILE *read_output;
78 /* FILE created by pex_read_err. */
79 FILE *read_err;
80 /* Number of temporary files to remove. */
81 int remove_count;
82 /* List of temporary files to remove; array allocated using malloc
83 of strings allocated using malloc. */
84 char **remove;
85 /* Pointers to system dependent functions. */
86 const struct pex_funcs *funcs;
87 /* For use by system dependent code. */
88 void *sysdep;
91 /* Functions passed to pex_run_common. */
93 struct pex_funcs
95 /* Open file NAME for reading. If BINARY is non-zero, open in
96 binary mode. Return >= 0 on success, -1 on error. */
97 int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
98 /* Open file NAME for writing. If BINARY is non-zero, open in
99 binary mode. Return >= 0 on success, -1 on error. */
100 int (*open_write) (struct pex_obj *, const char */* name */,
101 int /* binary */);
102 /* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
103 pex_run. IN, OUT, ERRDES, TOCLOSE are all descriptors, from
104 open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
105 STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
106 STD*_FILE_NO, they should be closed. If the descriptor TOCLOSE
107 is not -1, and the system supports pipes, TOCLOSE should be
108 closed in the child process. The function should handle the
109 PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
110 error and set *ERRMSG and *ERR. */
111 long (*exec_child) (struct pex_obj *, int /* flags */,
112 const char */* executable */, char * const * /* argv */,
113 char * const * /* env */,
114 int /* in */, int /* out */, int /* errdes */,
115 int /* toclose */, const char **/* errmsg */,
116 int */* err */);
117 /* Close a descriptor. Return 0 on success, -1 on error. */
118 int (*close) (struct pex_obj *, int);
119 /* Wait for a child to complete, returning exit status in *STATUS
120 and time in *TIME (if it is not null). CHILD is from fork. DONE
121 is 1 if this is called via pex_free. ERRMSG and ERR are as in
122 fork. Return 0 on success, -1 on error. */
123 int (*wait) (struct pex_obj *, long /* child */, int * /* status */,
124 struct pex_time * /* time */, int /* done */,
125 const char ** /* errmsg */, int * /* err */);
126 /* Create a pipe (only called if PEX_USE_PIPES is set) storing two
127 descriptors in P[0] and P[1]. If BINARY is non-zero, open in
128 binary mode. Return 0 on success, -1 on error. */
129 int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
130 /* Get a FILE pointer to read from a file descriptor (only called if
131 PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
132 mode. Return pointer on success, NULL on error. */
133 FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
134 /* Get a FILE pointer to write to the file descriptor FD (only
135 called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
136 binary mode. Arrange for FD not to be inherited by the child
137 processes. Return pointer on success, NULL on error. */
138 FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
139 /* Free any system dependent data associated with OBJ. May be
140 NULL if there is nothing to do. */
141 void (*cleanup) (struct pex_obj *);
144 extern struct pex_obj *pex_init_common (int, const char *, const char *,
145 const struct pex_funcs *);
147 #endif