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0
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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. Generic Unix version
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3 (also used for UWIN and VMS).
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4 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
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5 Free Software Foundation, Inc.
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6
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7 This file is part of the libiberty library.
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8 Libiberty is free software; you can redistribute it and/or
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9 modify it under the terms of the GNU Library General Public
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10 License as published by the Free Software Foundation; either
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11 version 2 of the License, or (at your option) any later version.
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12
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13 Libiberty is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 Library General Public License for more details.
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17
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18 You should have received a copy of the GNU Library General Public
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19 License along with libiberty; see the file COPYING.LIB. If not,
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20 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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21 Boston, MA 02110-1301, USA. */
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22
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23 #include "config.h"
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24 #include "libiberty.h"
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25 #include "pex-common.h"
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26
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27 #include <stdio.h>
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28 #include <signal.h>
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29 #include <errno.h>
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30 #ifdef NEED_DECLARATION_ERRNO
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31 extern int errno;
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32 #endif
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33 #ifdef HAVE_STDLIB_H
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34 #include <stdlib.h>
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35 #endif
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36 #ifdef HAVE_STRING_H
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37 #include <string.h>
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38 #endif
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39 #ifdef HAVE_UNISTD_H
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40 #include <unistd.h>
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41 #endif
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42
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43 #include <sys/types.h>
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44
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45 #ifdef HAVE_FCNTL_H
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46 #include <fcntl.h>
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47 #endif
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48 #ifdef HAVE_SYS_WAIT_H
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49 #include <sys/wait.h>
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50 #endif
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51 #ifdef HAVE_GETRUSAGE
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52 #include <sys/time.h>
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53 #include <sys/resource.h>
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54 #endif
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55 #ifdef HAVE_SYS_STAT_H
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56 #include <sys/stat.h>
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57 #endif
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58
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59
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60 #ifdef vfork /* Autoconf may define this to fork for us. */
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61 # define VFORK_STRING "fork"
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62 #else
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63 # define VFORK_STRING "vfork"
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64 #endif
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65 #ifdef HAVE_VFORK_H
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66 #include <vfork.h>
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67 #endif
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68 #ifdef VMS
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69 #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
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70 lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
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71 #endif /* VMS */
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72
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73
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74 /* File mode to use for private and world-readable files. */
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75
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76 #if defined (S_IRUSR) && defined (S_IWUSR) && defined (S_IRGRP) && defined (S_IWGRP) && defined (S_IROTH) && defined (S_IWOTH)
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77 #define PUBLIC_MODE \
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78 (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
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79 #else
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80 #define PUBLIC_MODE 0666
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81 #endif
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82
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83 /* Get the exit status of a particular process, and optionally get the
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84 time that it took. This is simple if we have wait4, slightly
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85 harder if we have waitpid, and is a pain if we only have wait. */
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86
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87 static pid_t pex_wait (struct pex_obj *, pid_t, int *, struct pex_time *);
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88
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89 #ifdef HAVE_WAIT4
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90
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91 static pid_t
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92 pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
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93 struct pex_time *time)
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94 {
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95 pid_t ret;
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96 struct rusage r;
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97
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98 #ifdef HAVE_WAITPID
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99 if (time == NULL)
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100 return waitpid (pid, status, 0);
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101 #endif
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102
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103 ret = wait4 (pid, status, 0, &r);
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104
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105 if (time != NULL)
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106 {
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107 time->user_seconds = r.ru_utime.tv_sec;
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108 time->user_microseconds= r.ru_utime.tv_usec;
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109 time->system_seconds = r.ru_stime.tv_sec;
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110 time->system_microseconds= r.ru_stime.tv_usec;
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111 }
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112
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113 return ret;
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114 }
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115
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116 #else /* ! defined (HAVE_WAIT4) */
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117
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118 #ifdef HAVE_WAITPID
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119
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120 #ifndef HAVE_GETRUSAGE
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121
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122 static pid_t
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123 pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
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124 struct pex_time *time)
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125 {
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126 if (time != NULL)
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127 memset (time, 0, sizeof (struct pex_time));
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128 return waitpid (pid, status, 0);
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129 }
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130
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131 #else /* defined (HAVE_GETRUSAGE) */
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132
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133 static pid_t
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134 pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
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135 struct pex_time *time)
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136 {
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137 struct rusage r1, r2;
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138 pid_t ret;
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139
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140 if (time == NULL)
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141 return waitpid (pid, status, 0);
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142
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143 getrusage (RUSAGE_CHILDREN, &r1);
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144
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145 ret = waitpid (pid, status, 0);
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146 if (ret < 0)
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147 return ret;
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148
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149 getrusage (RUSAGE_CHILDREN, &r2);
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150
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151 time->user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
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152 time->user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
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153 if (r2.ru_utime.tv_usec < r1.ru_utime.tv_usec)
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154 {
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155 --time->user_seconds;
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156 time->user_microseconds += 1000000;
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157 }
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158
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159 time->system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
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160 time->system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
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161 if (r2.ru_stime.tv_usec < r1.ru_stime.tv_usec)
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162 {
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163 --time->system_seconds;
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164 time->system_microseconds += 1000000;
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165 }
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166
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167 return ret;
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168 }
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169
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170 #endif /* defined (HAVE_GETRUSAGE) */
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171
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172 #else /* ! defined (HAVE_WAITPID) */
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173
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174 struct status_list
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175 {
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176 struct status_list *next;
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177 pid_t pid;
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178 int status;
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179 struct pex_time time;
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180 };
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181
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182 static pid_t
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183 pex_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time)
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184 {
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185 struct status_list **pp;
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186
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187 for (pp = (struct status_list **) &obj->sysdep;
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188 *pp != NULL;
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189 pp = &(*pp)->next)
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190 {
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191 if ((*pp)->pid == pid)
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192 {
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193 struct status_list *p;
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194
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195 p = *pp;
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196 *status = p->status;
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197 if (time != NULL)
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198 *time = p->time;
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199 *pp = p->next;
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200 free (p);
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201 return pid;
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202 }
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203 }
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204
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205 while (1)
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206 {
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207 pid_t cpid;
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208 struct status_list *psl;
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209 struct pex_time pt;
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210 #ifdef HAVE_GETRUSAGE
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211 struct rusage r1, r2;
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212 #endif
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213
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214 if (time != NULL)
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215 {
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216 #ifdef HAVE_GETRUSAGE
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217 getrusage (RUSAGE_CHILDREN, &r1);
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218 #else
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219 memset (&pt, 0, sizeof (struct pex_time));
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220 #endif
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221 }
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222
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223 cpid = wait (status);
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224
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225 #ifdef HAVE_GETRUSAGE
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226 if (time != NULL && cpid >= 0)
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227 {
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228 getrusage (RUSAGE_CHILDREN, &r2);
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229
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230 pt.user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
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231 pt.user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
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232 if (pt.user_microseconds < 0)
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233 {
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234 --pt.user_seconds;
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235 pt.user_microseconds += 1000000;
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236 }
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237
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238 pt.system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
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239 pt.system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
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240 if (pt.system_microseconds < 0)
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241 {
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242 --pt.system_seconds;
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243 pt.system_microseconds += 1000000;
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244 }
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245 }
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246 #endif
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247
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248 if (cpid < 0 || cpid == pid)
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249 {
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250 if (time != NULL)
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251 *time = pt;
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252 return cpid;
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253 }
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254
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255 psl = XNEW (struct status_list);
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256 psl->pid = cpid;
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257 psl->status = *status;
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258 if (time != NULL)
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259 psl->time = pt;
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260 psl->next = (struct status_list *) obj->sysdep;
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261 obj->sysdep = (void *) psl;
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262 }
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263 }
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264
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265 #endif /* ! defined (HAVE_WAITPID) */
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266 #endif /* ! defined (HAVE_WAIT4) */
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267
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268 static void pex_child_error (struct pex_obj *, const char *, const char *, int)
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269 ATTRIBUTE_NORETURN;
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270 static int pex_unix_open_read (struct pex_obj *, const char *, int);
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271 static int pex_unix_open_write (struct pex_obj *, const char *, int);
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272 static pid_t pex_unix_exec_child (struct pex_obj *, int, const char *,
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273 char * const *, char * const *,
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274 int, int, int, int,
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275 const char **, int *);
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276 static int pex_unix_close (struct pex_obj *, int);
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277 static int pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
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278 int, const char **, int *);
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279 static int pex_unix_pipe (struct pex_obj *, int *, int);
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280 static FILE *pex_unix_fdopenr (struct pex_obj *, int, int);
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281 static FILE *pex_unix_fdopenw (struct pex_obj *, int, int);
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282 static void pex_unix_cleanup (struct pex_obj *);
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283
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284 /* The list of functions we pass to the common routines. */
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285
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286 const struct pex_funcs funcs =
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287 {
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288 pex_unix_open_read,
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289 pex_unix_open_write,
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290 pex_unix_exec_child,
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291 pex_unix_close,
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292 pex_unix_wait,
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293 pex_unix_pipe,
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294 pex_unix_fdopenr,
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295 pex_unix_fdopenw,
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296 pex_unix_cleanup
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297 };
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298
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299 /* Return a newly initialized pex_obj structure. */
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300
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301 struct pex_obj *
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302 pex_init (int flags, const char *pname, const char *tempbase)
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303 {
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304 return pex_init_common (flags, pname, tempbase, &funcs);
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305 }
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306
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307 /* Open a file for reading. */
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308
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309 static int
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310 pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
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311 int binary ATTRIBUTE_UNUSED)
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312 {
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313 return open (name, O_RDONLY);
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314 }
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315
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316 /* Open a file for writing. */
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317
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318 static int
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319 pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
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320 int binary ATTRIBUTE_UNUSED)
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321 {
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322 /* Note that we can't use O_EXCL here because gcc may have already
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323 created the temporary file via make_temp_file. */
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324 return open (name, O_WRONLY | O_CREAT | O_TRUNC, PUBLIC_MODE);
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325 }
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326
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327 /* Close a file. */
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328
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329 static int
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330 pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
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331 {
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332 return close (fd);
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333 }
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334
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335 /* Report an error from a child process. We don't use stdio routines,
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336 because we might be here due to a vfork call. */
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337
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338 static void
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339 pex_child_error (struct pex_obj *obj, const char *executable,
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340 const char *errmsg, int err)
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341 {
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342 #define writeerr(s) (void) write (STDERR_FILE_NO, s, strlen (s))
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343 writeerr (obj->pname);
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344 writeerr (": error trying to exec '");
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345 writeerr (executable);
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346 writeerr ("': ");
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347 writeerr (errmsg);
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348 writeerr (": ");
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349 writeerr (xstrerror (err));
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350 writeerr ("\n");
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351 _exit (-1);
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352 }
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353
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354 /* Execute a child. */
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355
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356 extern char **environ;
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357
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358 static pid_t
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359 pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable,
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360 char * const * argv, char * const * env,
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361 int in, int out, int errdes,
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362 int toclose, const char **errmsg, int *err)
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363 {
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364 pid_t pid;
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365
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366 /* We declare these to be volatile to avoid warnings from gcc about
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367 them being clobbered by vfork. */
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368 volatile int sleep_interval;
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369 volatile int retries;
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370
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371 sleep_interval = 1;
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372 pid = -1;
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373 for (retries = 0; retries < 4; ++retries)
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374 {
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375 pid = vfork ();
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376 if (pid >= 0)
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377 break;
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378 sleep (sleep_interval);
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379 sleep_interval *= 2;
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380 }
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381
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382 switch (pid)
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383 {
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384 case -1:
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385 *err = errno;
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386 *errmsg = VFORK_STRING;
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387 return (pid_t) -1;
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388
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389 case 0:
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390 /* Child process. */
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391 if (in != STDIN_FILE_NO)
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392 {
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393 if (dup2 (in, STDIN_FILE_NO) < 0)
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394 pex_child_error (obj, executable, "dup2", errno);
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395 if (close (in) < 0)
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396 pex_child_error (obj, executable, "close", errno);
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397 }
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398 if (out != STDOUT_FILE_NO)
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399 {
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400 if (dup2 (out, STDOUT_FILE_NO) < 0)
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401 pex_child_error (obj, executable, "dup2", errno);
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402 if (close (out) < 0)
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403 pex_child_error (obj, executable, "close", errno);
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404 }
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405 if (errdes != STDERR_FILE_NO)
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406 {
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407 if (dup2 (errdes, STDERR_FILE_NO) < 0)
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408 pex_child_error (obj, executable, "dup2", errno);
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409 if (close (errdes) < 0)
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410 pex_child_error (obj, executable, "close", errno);
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411 }
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412 if (toclose >= 0)
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413 {
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414 if (close (toclose) < 0)
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415 pex_child_error (obj, executable, "close", errno);
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416 }
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417 if ((flags & PEX_STDERR_TO_STDOUT) != 0)
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418 {
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419 if (dup2 (STDOUT_FILE_NO, STDERR_FILE_NO) < 0)
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420 pex_child_error (obj, executable, "dup2", errno);
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421 }
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422
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423 if (env)
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424 environ = (char**) env;
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425
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|
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426 if ((flags & PEX_SEARCH) != 0)
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427 {
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|
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428 execvp (executable, argv);
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|
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429 pex_child_error (obj, executable, "execvp", errno);
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|
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430 }
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|
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431 else
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432 {
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|
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433 execv (executable, argv);
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|
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434 pex_child_error (obj, executable, "execv", errno);
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|
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435 }
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|
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436
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|
|
437 /* NOTREACHED */
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|
|
438 return (pid_t) -1;
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|
|
439
|
|
|
440 default:
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|
|
441 /* Parent process. */
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|
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442 if (in != STDIN_FILE_NO)
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|
|
443 {
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|
|
444 if (close (in) < 0)
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|
|
445 {
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|
|
446 *err = errno;
|
|
|
447 *errmsg = "close";
|
|
|
448 return (pid_t) -1;
|
|
|
449 }
|
|
|
450 }
|
|
|
451 if (out != STDOUT_FILE_NO)
|
|
|
452 {
|
|
|
453 if (close (out) < 0)
|
|
|
454 {
|
|
|
455 *err = errno;
|
|
|
456 *errmsg = "close";
|
|
|
457 return (pid_t) -1;
|
|
|
458 }
|
|
|
459 }
|
|
|
460 if (errdes != STDERR_FILE_NO)
|
|
|
461 {
|
|
|
462 if (close (errdes) < 0)
|
|
|
463 {
|
|
|
464 *err = errno;
|
|
|
465 *errmsg = "close";
|
|
|
466 return (pid_t) -1;
|
|
|
467 }
|
|
|
468 }
|
|
|
469
|
|
|
470 return pid;
|
|
|
471 }
|
|
|
472 }
|
|
|
473
|
|
|
474 /* Wait for a child process to complete. */
|
|
|
475
|
|
|
476 static int
|
|
|
477 pex_unix_wait (struct pex_obj *obj, pid_t pid, int *status,
|
|
|
478 struct pex_time *time, int done, const char **errmsg,
|
|
|
479 int *err)
|
|
|
480 {
|
|
|
481 /* If we are cleaning up when the caller didn't retrieve process
|
|
|
482 status for some reason, encourage the process to go away. */
|
|
|
483 if (done)
|
|
|
484 kill (pid, SIGTERM);
|
|
|
485
|
|
|
486 if (pex_wait (obj, pid, status, time) < 0)
|
|
|
487 {
|
|
|
488 *err = errno;
|
|
|
489 *errmsg = "wait";
|
|
|
490 return -1;
|
|
|
491 }
|
|
|
492
|
|
|
493 return 0;
|
|
|
494 }
|
|
|
495
|
|
|
496 /* Create a pipe. */
|
|
|
497
|
|
|
498 static int
|
|
|
499 pex_unix_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p,
|
|
|
500 int binary ATTRIBUTE_UNUSED)
|
|
|
501 {
|
|
|
502 return pipe (p);
|
|
|
503 }
|
|
|
504
|
|
|
505 /* Get a FILE pointer to read from a file descriptor. */
|
|
|
506
|
|
|
507 static FILE *
|
|
|
508 pex_unix_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
|
|
|
509 int binary ATTRIBUTE_UNUSED)
|
|
|
510 {
|
|
|
511 return fdopen (fd, "r");
|
|
|
512 }
|
|
|
513
|
|
|
514 static FILE *
|
|
|
515 pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
|
|
|
516 int binary ATTRIBUTE_UNUSED)
|
|
|
517 {
|
|
|
518 if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
|
|
|
519 return NULL;
|
|
|
520 return fdopen (fd, "w");
|
|
|
521 }
|
|
|
522
|
|
|
523 static void
|
|
|
524 pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED)
|
|
|
525 {
|
|
|
526 #if !defined (HAVE_WAIT4) && !defined (HAVE_WAITPID)
|
|
|
527 while (obj->sysdep != NULL)
|
|
|
528 {
|
|
|
529 struct status_list *this;
|
|
|
530 struct status_list *next;
|
|
|
531
|
|
|
532 this = (struct status_list *) obj->sysdep;
|
|
|
533 next = this->next;
|
|
|
534 free (this);
|
|
|
535 obj->sysdep = (void *) next;
|
|
|
536 }
|
|
|
537 #endif
|
|
|
538 }
|
