Mercurial > hg
annotate contrib/chg/util.c @ 51151:2705748ba166 stable
perf-tags: fix the --clear-fnode-cache-rev code
It seems like this code never run?
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 03 Dec 2023 04:43:08 +0100 |
parents | 763b45bc4483 |
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rev | line source |
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28060 | 1 /* |
2 * Utility functions | |
3 * | |
4 * Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org> | |
5 * | |
6 * This software may be used and distributed according to the terms of the | |
7 * GNU General Public License version 2 or any later version. | |
8 */ | |
9 | |
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10 #include <errno.h> |
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11 #include <fcntl.h> |
28060 | 12 #include <signal.h> |
13 #include <stdarg.h> | |
14 #include <stdio.h> | |
15 #include <stdlib.h> | |
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16 #include <string.h> |
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17 #include <sys/time.h> |
28060 | 18 #include <sys/types.h> |
19 #include <sys/wait.h> | |
20 #include <unistd.h> | |
21 | |
22 #include "util.h" | |
23 | |
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24 static int colorenabled = 0; |
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25 |
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26 static inline void fsetcolor(FILE *fp, const char *code) |
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27 { |
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28 if (!colorenabled) { |
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29 return; |
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30 } |
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31 fprintf(fp, "\033[%sm", code); |
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32 } |
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33 |
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34 static void vabortmsgerrno(int no, const char *fmt, va_list args) |
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35 { |
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36 fsetcolor(stderr, "1;31"); |
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37 fputs("chg: abort: ", stderr); |
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38 vfprintf(stderr, fmt, args); |
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39 if (no != 0) { |
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40 fprintf(stderr, " (errno = %d, %s)", no, strerror(no)); |
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41 } |
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42 fsetcolor(stderr, ""); |
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43 fputc('\n', stderr); |
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44 exit(255); |
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45 } |
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46 |
28060 | 47 void abortmsg(const char *fmt, ...) |
48 { | |
49 va_list args; | |
50 va_start(args, fmt); | |
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51 vabortmsgerrno(0, fmt, args); |
28060 | 52 va_end(args); |
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53 } |
28060 | 54 |
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55 void abortmsgerrno(const char *fmt, ...) |
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56 { |
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57 int no = errno; |
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58 va_list args; |
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59 va_start(args, fmt); |
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60 vabortmsgerrno(no, fmt, args); |
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61 va_end(args); |
28060 | 62 } |
63 | |
64 static int debugmsgenabled = 0; | |
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65 static double debugstart = 0; |
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66 |
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67 static double now() |
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68 { |
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69 struct timeval t; |
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70 gettimeofday(&t, NULL); |
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71 return t.tv_usec / 1e6 + t.tv_sec; |
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72 } |
28060 | 73 |
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74 void enablecolor(void) |
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75 { |
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76 colorenabled = 1; |
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77 } |
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78 |
28060 | 79 void enabledebugmsg(void) |
80 { | |
81 debugmsgenabled = 1; | |
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82 debugstart = now(); |
28060 | 83 } |
84 | |
85 void debugmsg(const char *fmt, ...) | |
86 { | |
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87 if (!debugmsgenabled) { |
28060 | 88 return; |
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89 } |
28060 | 90 |
91 va_list args; | |
92 va_start(args, fmt); | |
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93 fsetcolor(stderr, "1;30"); |
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94 fprintf(stderr, "chg: debug: %4.6f ", now() - debugstart); |
28060 | 95 vfprintf(stderr, fmt, args); |
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96 fsetcolor(stderr, ""); |
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97 fputc('\n', stderr); |
28060 | 98 va_end(args); |
99 } | |
100 | |
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101 void fchdirx(int dirfd) |
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102 { |
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103 int r = fchdir(dirfd); |
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104 if (r == -1) { |
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105 abortmsgerrno("failed to fchdir"); |
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106 } |
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107 } |
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108 |
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109 void fsetcloexec(int fd) |
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110 { |
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111 int flags = fcntl(fd, F_GETFD); |
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112 if (flags < 0) { |
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113 abortmsgerrno("cannot get flags of fd %d", fd); |
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114 } |
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115 if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) { |
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116 abortmsgerrno("cannot set flags of fd %d", fd); |
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117 } |
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118 } |
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119 |
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120 void *mallocx(size_t size) |
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121 { |
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122 void *result = malloc(size); |
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123 if (!result) { |
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124 abortmsg("failed to malloc"); |
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125 } |
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126 return result; |
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127 } |
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128 |
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129 void *reallocx(void *ptr, size_t size) |
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130 { |
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131 void *result = realloc(ptr, size); |
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132 if (!result) { |
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133 abortmsg("failed to realloc"); |
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134 } |
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135 return result; |
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136 } |
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137 |
28060 | 138 /* |
139 * Execute a shell command in mostly the same manner as system(), with the | |
140 * give environment variables, after chdir to the given cwd. Returns a status | |
141 * code compatible with the Python subprocess module. | |
142 */ | |
143 int runshellcmd(const char *cmd, const char *envp[], const char *cwd) | |
144 { | |
145 enum { F_SIGINT = 1, F_SIGQUIT = 2, F_SIGMASK = 4, F_WAITPID = 8 }; | |
146 unsigned int doneflags = 0; | |
147 int status = 0; | |
148 struct sigaction newsa, oldsaint, oldsaquit; | |
149 sigset_t oldmask; | |
150 | |
151 /* block or mask signals just as system() does */ | |
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152 memset(&newsa, 0, sizeof(newsa)); |
28060 | 153 newsa.sa_handler = SIG_IGN; |
154 newsa.sa_flags = 0; | |
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155 if (sigemptyset(&newsa.sa_mask) < 0) { |
28060 | 156 goto done; |
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157 } |
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158 if (sigaction(SIGINT, &newsa, &oldsaint) < 0) { |
28060 | 159 goto done; |
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160 } |
28060 | 161 doneflags |= F_SIGINT; |
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162 if (sigaction(SIGQUIT, &newsa, &oldsaquit) < 0) { |
28060 | 163 goto done; |
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164 } |
28060 | 165 doneflags |= F_SIGQUIT; |
166 | |
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167 if (sigaddset(&newsa.sa_mask, SIGCHLD) < 0) { |
28060 | 168 goto done; |
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169 } |
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170 if (sigprocmask(SIG_BLOCK, &newsa.sa_mask, &oldmask) < 0) { |
28060 | 171 goto done; |
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172 } |
28060 | 173 doneflags |= F_SIGMASK; |
174 | |
175 pid_t pid = fork(); | |
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176 if (pid < 0) { |
28060 | 177 goto done; |
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178 } |
28060 | 179 if (pid == 0) { |
180 sigaction(SIGINT, &oldsaint, NULL); | |
181 sigaction(SIGQUIT, &oldsaquit, NULL); | |
182 sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
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183 if (cwd && chdir(cwd) < 0) { |
28060 | 184 _exit(127); |
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185 } |
28060 | 186 const char *argv[] = {"sh", "-c", cmd, NULL}; |
187 if (envp) { | |
188 execve("/bin/sh", (char **)argv, (char **)envp); | |
189 } else { | |
190 execv("/bin/sh", (char **)argv); | |
191 } | |
192 _exit(127); | |
193 } else { | |
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194 if (waitpid(pid, &status, 0) < 0) { |
28060 | 195 goto done; |
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196 } |
28060 | 197 doneflags |= F_WAITPID; |
198 } | |
199 | |
200 done: | |
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201 if (doneflags & F_SIGINT) { |
28060 | 202 sigaction(SIGINT, &oldsaint, NULL); |
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203 } |
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204 if (doneflags & F_SIGQUIT) { |
28060 | 205 sigaction(SIGQUIT, &oldsaquit, NULL); |
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206 } |
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207 if (doneflags & F_SIGMASK) { |
28060 | 208 sigprocmask(SIG_SETMASK, &oldmask, NULL); |
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209 } |
28060 | 210 |
211 /* no way to report other errors, use 127 (= shell termination) */ | |
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212 if (!(doneflags & F_WAITPID)) { |
28060 | 213 return 127; |
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214 } |
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215 if (WIFEXITED(status)) { |
28060 | 216 return WEXITSTATUS(status); |
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217 } |
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218 if (WIFSIGNALED(status)) { |
28060 | 219 return -WTERMSIG(status); |
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220 } |
28060 | 221 return 127; |
222 } |