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>
date Sun, 03 Dec 2023 04:43:08 +0100
parents 763b45bc4483
children
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1 /*
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2 * Utility functions
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3 *
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4 * Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org>
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5 *
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6 * This software may be used and distributed according to the terms of the
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7 * GNU General Public License version 2 or any later version.
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8 */
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9
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10 #include <errno.h>
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11 #include <fcntl.h>
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12 #include <signal.h>
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13 #include <stdarg.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <sys/time.h>
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18 #include <sys/types.h>
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19 #include <sys/wait.h>
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20 #include <unistd.h>
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21
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22 #include "util.h"
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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
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47 void abortmsg(const char *fmt, ...)
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48 {
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49 va_list args;
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50 va_start(args, fmt);
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51 vabortmsgerrno(0, fmt, args);
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52 va_end(args);
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53 }
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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);
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62 }
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63
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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 }
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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
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79 void enabledebugmsg(void)
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80 {
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81 debugmsgenabled = 1;
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82 debugstart = now();
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83 }
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84
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85 void debugmsg(const char *fmt, ...)
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86 {
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87 if (!debugmsgenabled) {
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88 return;
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89 }
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90
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91 va_list args;
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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);
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95 vfprintf(stderr, fmt, args);
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96 fsetcolor(stderr, "");
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97 fputc('\n', stderr);
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98 va_end(args);
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99 }
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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
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138 /*
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139 * Execute a shell command in mostly the same manner as system(), with the
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140 * give environment variables, after chdir to the given cwd. Returns a status
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141 * code compatible with the Python subprocess module.
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142 */
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143 int runshellcmd(const char *cmd, const char *envp[], const char *cwd)
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144 {
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145 enum { F_SIGINT = 1, F_SIGQUIT = 2, F_SIGMASK = 4, F_WAITPID = 8 };
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146 unsigned int doneflags = 0;
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147 int status = 0;
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Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
148 struct sigaction newsa, oldsaint, oldsaquit;
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
149 sigset_t oldmask;
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parents:
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150
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
151 /* block or mask signals just as system() does */
28084
3fc45956c978 chg: initialize sigaction fields more reliably
Yuya Nishihara <yuya@tcha.org>
parents: 28060
diff changeset
152 memset(&newsa, 0, sizeof(newsa));
28060
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Yuya Nishihara <yuya@tcha.org>
parents:
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153 newsa.sa_handler = SIG_IGN;
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Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
154 newsa.sa_flags = 0;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
155 if (sigemptyset(&newsa.sa_mask) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
156 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
157 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
158 if (sigaction(SIGINT, &newsa, &oldsaint) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
159 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
160 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
161 doneflags |= F_SIGINT;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
162 if (sigaction(SIGQUIT, &newsa, &oldsaquit) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
163 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
164 }
28060
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Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
165 doneflags |= F_SIGQUIT;
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
166
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
167 if (sigaddset(&newsa.sa_mask, SIGCHLD) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
168 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
169 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
170 if (sigprocmask(SIG_BLOCK, &newsa.sa_mask, &oldmask) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
171 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
172 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
173 doneflags |= F_SIGMASK;
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
174
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
175 pid_t pid = fork();
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
176 if (pid < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
177 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
178 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
179 if (pid == 0) {
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
180 sigaction(SIGINT, &oldsaint, NULL);
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Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
181 sigaction(SIGQUIT, &oldsaquit, NULL);
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
182 sigprocmask(SIG_SETMASK, &oldmask, NULL);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
183 if (cwd && chdir(cwd) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
184 _exit(127);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
185 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
186 const char *argv[] = {"sh", "-c", cmd, NULL};
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
187 if (envp) {
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
188 execve("/bin/sh", (char **)argv, (char **)envp);
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
189 } else {
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
190 execv("/bin/sh", (char **)argv);
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
191 }
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
192 _exit(127);
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
193 } else {
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
194 if (waitpid(pid, &status, 0) < 0) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
195 goto done;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
196 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
197 doneflags |= F_WAITPID;
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
198 }
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
199
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
200 done:
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
201 if (doneflags & F_SIGINT) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
202 sigaction(SIGINT, &oldsaint, NULL);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
203 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
204 if (doneflags & F_SIGQUIT) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
205 sigaction(SIGQUIT, &oldsaquit, NULL);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
206 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
207 if (doneflags & F_SIGMASK) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
208 sigprocmask(SIG_SETMASK, &oldmask, NULL);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
209 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
210
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
211 /* no way to report other errors, use 127 (= shell termination) */
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
212 if (!(doneflags & F_WAITPID)) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
213 return 127;
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
214 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
215 if (WIFEXITED(status)) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
216 return WEXITSTATUS(status);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
217 }
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
218 if (WIFSIGNALED(status)) {
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
219 return -WTERMSIG(status);
41336
763b45bc4483 cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents: 35959
diff changeset
220 }
28060
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
221 return 127;
726f8d6cc324 chg: import frontend sources
Yuya Nishihara <yuya@tcha.org>
parents:
diff changeset
222 }