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1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
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2 with other subprocesses), and wait for it. Shared logic.
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3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004
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4 Free Software Foundation, Inc.
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5
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6 This file is part of the libiberty library.
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7 Libiberty is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU Library General Public
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9 License as published by the Free Software Foundation; either
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10 version 2 of the License, or (at your option) any later version.
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11
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12 Libiberty is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Library General Public License for more details.
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16
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17 You should have received a copy of the GNU Library General Public
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18 License along with libiberty; see the file COPYING.LIB. If not,
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19 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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20 Boston, MA 02110-1301, USA. */
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21
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22 #ifndef PEX_COMMON_H
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23 #define PEX_COMMON_H
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24
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25 #include "config.h"
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26 #include "libiberty.h"
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27 #include <stdio.h>
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28
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29 /* pid_t is may defined by config.h or sys/types.h needs to be
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30 included. */
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31 #if !defined(pid_t) && defined(HAVE_SYS_TYPES_H)
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32 #include <sys/types.h>
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33 #endif
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34
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35 #define install_error_msg "installation problem, cannot exec `%s'"
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36
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37 /* stdin file number. */
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38 #define STDIN_FILE_NO 0
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39
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40 /* stdout file number. */
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41 #define STDOUT_FILE_NO 1
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42
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43 /* stderr file number. */
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44 #define STDERR_FILE_NO 2
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45
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46 /* value of `pipe': port index for reading. */
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47 #define READ_PORT 0
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48
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49 /* value of `pipe': port index for writing. */
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50 #define WRITE_PORT 1
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51
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52 /* The structure used by pex_init and friends. */
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53
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54 struct pex_obj
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55 {
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56 /* Flags. */
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57 int flags;
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58 /* Name of calling program, for error messages. */
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59 const char *pname;
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60 /* Base name to use for temporary files. */
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61 const char *tempbase;
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62 /* Pipe to use as stdin for next process. */
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63 int next_input;
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64 /* File name to use as stdin for next process. */
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65 char *next_input_name;
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66 /* Whether next_input_name was allocated using malloc. */
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67 int next_input_name_allocated;
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68 /* If not -1, stderr pipe from the last process. */
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69 int stderr_pipe;
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70 /* Number of child processes. */
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71 int count;
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72 /* PIDs of child processes; array allocated using malloc. */
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73 long *children;
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74 /* Exit statuses of child processes; array allocated using malloc. */
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75 int *status;
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76 /* Time used by child processes; array allocated using malloc. */
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77 struct pex_time *time;
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78 /* Number of children we have already waited for. */
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79 int number_waited;
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80 /* FILE created by pex_input_file. */
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81 FILE *input_file;
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82 /* FILE created by pex_read_output. */
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83 FILE *read_output;
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84 /* FILE created by pex_read_err. */
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85 FILE *read_err;
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86 /* Number of temporary files to remove. */
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87 int remove_count;
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88 /* List of temporary files to remove; array allocated using malloc
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89 of strings allocated using malloc. */
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90 char **remove;
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91 /* Pointers to system dependent functions. */
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92 const struct pex_funcs *funcs;
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93 /* For use by system dependent code. */
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94 void *sysdep;
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95 };
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96
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97 /* Functions passed to pex_run_common. */
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98
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99 struct pex_funcs
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100 {
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101 /* Open file NAME for reading. If BINARY is non-zero, open in
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102 binary mode. Return >= 0 on success, -1 on error. */
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103 int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
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104 /* Open file NAME for writing. If BINARY is non-zero, open in
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105 binary mode. Return >= 0 on success, -1 on error. */
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106 int (*open_write) (struct pex_obj *, const char */* name */,
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107 int /* binary */);
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108 /* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
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109 pex_run. IN, OUT, ERRDES, TOCLOSE are all descriptors, from
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110 open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
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111 STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
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112 STD*_FILE_NO, they should be closed. If the descriptor TOCLOSE
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113 is not -1, and the system supports pipes, TOCLOSE should be
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114 closed in the child process. The function should handle the
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115 PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
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116 error and set *ERRMSG and *ERR. */
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117 pid_t (*exec_child) (struct pex_obj *, int /* flags */,
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118 const char */* executable */, char * const * /* argv */,
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119 char * const * /* env */,
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120 int /* in */, int /* out */, int /* errdes */,
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121 int /* toclose */, const char **/* errmsg */,
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122 int */* err */);
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123 /* Close a descriptor. Return 0 on success, -1 on error. */
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124 int (*close) (struct pex_obj *, int);
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125 /* Wait for a child to complete, returning exit status in *STATUS
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126 and time in *TIME (if it is not null). CHILD is from fork. DONE
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127 is 1 if this is called via pex_free. ERRMSG and ERR are as in
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128 fork. Return 0 on success, -1 on error. */
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129 int (*wait) (struct pex_obj *, pid_t /* child */, int * /* status */,
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130 struct pex_time * /* time */, int /* done */,
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131 const char ** /* errmsg */, int * /* err */);
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132 /* Create a pipe (only called if PEX_USE_PIPES is set) storing two
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133 descriptors in P[0] and P[1]. If BINARY is non-zero, open in
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134 binary mode. Return 0 on success, -1 on error. */
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135 int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
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136 /* Get a FILE pointer to read from a file descriptor (only called if
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137 PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
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138 mode. Return pointer on success, NULL on error. */
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139 FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
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140 /* Get a FILE pointer to write to the file descriptor FD (only
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141 called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
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142 binary mode. Arrange for FD not to be inherited by the child
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143 processes. Return pointer on success, NULL on error. */
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144 FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
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145 /* Free any system dependent data associated with OBJ. May be
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146 NULL if there is nothing to do. */
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147 void (*cleanup) (struct pex_obj *);
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148 };
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149
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150 extern struct pex_obj *pex_init_common (int, const char *, const char *,
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151 const struct pex_funcs *);
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152
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153 #endif
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