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comparison libiberty/pex-common.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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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.
5
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.
11
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.
16
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. */
21
22 #ifndef PEX_COMMON_H
23 #define PEX_COMMON_H
24
25 #include "config.h"
26 #include "libiberty.h"
27 #include <stdio.h>
28
29 /* pid_t is may defined by config.h or sys/types.h needs to be
30 included. */
31 #if !defined(pid_t) && defined(HAVE_SYS_TYPES_H)
32 #include <sys/types.h>
33 #endif
34
35 #define install_error_msg "installation problem, cannot exec `%s'"
36
37 /* stdin file number. */
38 #define STDIN_FILE_NO 0
39
40 /* stdout file number. */
41 #define STDOUT_FILE_NO 1
42
43 /* stderr file number. */
44 #define STDERR_FILE_NO 2
45
46 /* value of `pipe': port index for reading. */
47 #define READ_PORT 0
48
49 /* value of `pipe': port index for writing. */
50 #define WRITE_PORT 1
51
52 /* The structure used by pex_init and friends. */
53
54 struct pex_obj
55 {
56 /* Flags. */
57 int flags;
58 /* Name of calling program, for error messages. */
59 const char *pname;
60 /* Base name to use for temporary files. */
61 const char *tempbase;
62 /* Pipe to use as stdin for next process. */
63 int next_input;
64 /* File name to use as stdin for next process. */
65 char *next_input_name;
66 /* Whether next_input_name was allocated using malloc. */
67 int next_input_name_allocated;
68 /* If not -1, stderr pipe from the last process. */
69 int stderr_pipe;
70 /* Number of child processes. */
71 int count;
72 /* PIDs of child processes; array allocated using malloc. */
73 long *children;
74 /* Exit statuses of child processes; array allocated using malloc. */
75 int *status;
76 /* Time used by child processes; array allocated using malloc. */
77 struct pex_time *time;
78 /* Number of children we have already waited for. */
79 int number_waited;
80 /* FILE created by pex_input_file. */
81 FILE *input_file;
82 /* FILE created by pex_read_output. */
83 FILE *read_output;
84 /* FILE created by pex_read_err. */
85 FILE *read_err;
86 /* Number of temporary files to remove. */
87 int remove_count;
88 /* List of temporary files to remove; array allocated using malloc
89 of strings allocated using malloc. */
90 char **remove;
91 /* Pointers to system dependent functions. */
92 const struct pex_funcs *funcs;
93 /* For use by system dependent code. */
94 void *sysdep;
95 };
96
97 /* Functions passed to pex_run_common. */
98
99 struct pex_funcs
100 {
101 /* Open file NAME for reading. If BINARY is non-zero, open in
102 binary mode. Return >= 0 on success, -1 on error. */
103 int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
104 /* Open file NAME for writing. If BINARY is non-zero, open in
105 binary mode. Return >= 0 on success, -1 on error. */
106 int (*open_write) (struct pex_obj *, const char */* name */,
107 int /* binary */);
108 /* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
109 pex_run. IN, OUT, ERRDES, TOCLOSE are all descriptors, from
110 open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
111 STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
112 STD*_FILE_NO, they should be closed. If the descriptor TOCLOSE
113 is not -1, and the system supports pipes, TOCLOSE should be
114 closed in the child process. The function should handle the
115 PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
116 error and set *ERRMSG and *ERR. */
117 pid_t (*exec_child) (struct pex_obj *, int /* flags */,
118 const char */* executable */, char * const * /* argv */,
119 char * const * /* env */,
120 int /* in */, int /* out */, int /* errdes */,
121 int /* toclose */, const char **/* errmsg */,
122 int */* err */);
123 /* Close a descriptor. Return 0 on success, -1 on error. */
124 int (*close) (struct pex_obj *, int);
125 /* Wait for a child to complete, returning exit status in *STATUS
126 and time in *TIME (if it is not null). CHILD is from fork. DONE
127 is 1 if this is called via pex_free. ERRMSG and ERR are as in
128 fork. Return 0 on success, -1 on error. */
129 int (*wait) (struct pex_obj *, pid_t /* child */, int * /* status */,
130 struct pex_time * /* time */, int /* done */,
131 const char ** /* errmsg */, int * /* err */);
132 /* Create a pipe (only called if PEX_USE_PIPES is set) storing two
133 descriptors in P[0] and P[1]. If BINARY is non-zero, open in
134 binary mode. Return 0 on success, -1 on error. */
135 int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
136 /* Get a FILE pointer to read from a file descriptor (only called if
137 PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
138 mode. Return pointer on success, NULL on error. */
139 FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
140 /* Get a FILE pointer to write to the file descriptor FD (only
141 called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
142 binary mode. Arrange for FD not to be inherited by the child
143 processes. Return pointer on success, NULL on error. */
144 FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
145 /* Free any system dependent data associated with OBJ. May be
146 NULL if there is nothing to do. */
147 void (*cleanup) (struct pex_obj *);
148 };
149
150 extern struct pex_obj *pex_init_common (int, const char *, const char *,
151 const struct pex_funcs *);
152
153 #endif