Commit | Line | Data |
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07800601 IM |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
4 | ||
5 | static inline void close_pair(int fd[2]) | |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
11 | static inline void dup_devnull(int to) | |
12 | { | |
13 | int fd = open("/dev/null", O_RDWR); | |
14 | dup2(fd, to); | |
15 | close(fd); | |
16 | } | |
17 | ||
18 | int start_command(struct child_process *cmd) | |
19 | { | |
20 | int need_in, need_out, need_err; | |
21 | int fdin[2], fdout[2], fderr[2]; | |
22 | ||
23 | /* | |
24 | * In case of errors we must keep the promise to close FDs | |
25 | * that have been passed in via ->in and ->out. | |
26 | */ | |
27 | ||
28 | need_in = !cmd->no_stdin && cmd->in < 0; | |
29 | if (need_in) { | |
30 | if (pipe(fdin) < 0) { | |
31 | if (cmd->out > 0) | |
32 | close(cmd->out); | |
33 | return -ERR_RUN_COMMAND_PIPE; | |
34 | } | |
35 | cmd->in = fdin[1]; | |
36 | } | |
37 | ||
38 | need_out = !cmd->no_stdout | |
39 | && !cmd->stdout_to_stderr | |
40 | && cmd->out < 0; | |
41 | if (need_out) { | |
42 | if (pipe(fdout) < 0) { | |
43 | if (need_in) | |
44 | close_pair(fdin); | |
45 | else if (cmd->in) | |
46 | close(cmd->in); | |
47 | return -ERR_RUN_COMMAND_PIPE; | |
48 | } | |
49 | cmd->out = fdout[0]; | |
50 | } | |
51 | ||
52 | need_err = !cmd->no_stderr && cmd->err < 0; | |
53 | if (need_err) { | |
54 | if (pipe(fderr) < 0) { | |
55 | if (need_in) | |
56 | close_pair(fdin); | |
57 | else if (cmd->in) | |
58 | close(cmd->in); | |
59 | if (need_out) | |
60 | close_pair(fdout); | |
61 | else if (cmd->out) | |
62 | close(cmd->out); | |
63 | return -ERR_RUN_COMMAND_PIPE; | |
64 | } | |
65 | cmd->err = fderr[0]; | |
66 | } | |
67 | ||
07800601 IM |
68 | fflush(NULL); |
69 | cmd->pid = fork(); | |
70 | if (!cmd->pid) { | |
71 | if (cmd->no_stdin) | |
72 | dup_devnull(0); | |
73 | else if (need_in) { | |
74 | dup2(fdin[0], 0); | |
75 | close_pair(fdin); | |
76 | } else if (cmd->in) { | |
77 | dup2(cmd->in, 0); | |
78 | close(cmd->in); | |
79 | } | |
80 | ||
81 | if (cmd->no_stderr) | |
82 | dup_devnull(2); | |
83 | else if (need_err) { | |
84 | dup2(fderr[1], 2); | |
85 | close_pair(fderr); | |
86 | } | |
87 | ||
88 | if (cmd->no_stdout) | |
89 | dup_devnull(1); | |
90 | else if (cmd->stdout_to_stderr) | |
91 | dup2(2, 1); | |
92 | else if (need_out) { | |
93 | dup2(fdout[1], 1); | |
94 | close_pair(fdout); | |
95 | } else if (cmd->out > 1) { | |
96 | dup2(cmd->out, 1); | |
97 | close(cmd->out); | |
98 | } | |
99 | ||
100 | if (cmd->dir && chdir(cmd->dir)) | |
101 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
102 | cmd->dir, strerror(errno)); | |
103 | if (cmd->env) { | |
104 | for (; *cmd->env; cmd->env++) { | |
105 | if (strchr(*cmd->env, '=')) | |
106 | putenv((char*)*cmd->env); | |
107 | else | |
108 | unsetenv(*cmd->env); | |
109 | } | |
110 | } | |
111 | if (cmd->preexec_cb) | |
112 | cmd->preexec_cb(); | |
113 | if (cmd->perf_cmd) { | |
114 | execv_perf_cmd(cmd->argv); | |
115 | } else { | |
116 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
117 | } | |
118 | exit(127); | |
119 | } | |
07800601 IM |
120 | |
121 | if (cmd->pid < 0) { | |
122 | int err = errno; | |
123 | if (need_in) | |
124 | close_pair(fdin); | |
125 | else if (cmd->in) | |
126 | close(cmd->in); | |
127 | if (need_out) | |
128 | close_pair(fdout); | |
129 | else if (cmd->out) | |
130 | close(cmd->out); | |
131 | if (need_err) | |
132 | close_pair(fderr); | |
133 | return err == ENOENT ? | |
134 | -ERR_RUN_COMMAND_EXEC : | |
135 | -ERR_RUN_COMMAND_FORK; | |
136 | } | |
137 | ||
138 | if (need_in) | |
139 | close(fdin[0]); | |
140 | else if (cmd->in) | |
141 | close(cmd->in); | |
142 | ||
143 | if (need_out) | |
144 | close(fdout[1]); | |
145 | else if (cmd->out) | |
146 | close(cmd->out); | |
147 | ||
148 | if (need_err) | |
149 | close(fderr[1]); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static int wait_or_whine(pid_t pid) | |
155 | { | |
156 | for (;;) { | |
157 | int status, code; | |
158 | pid_t waiting = waitpid(pid, &status, 0); | |
159 | ||
160 | if (waiting < 0) { | |
161 | if (errno == EINTR) | |
162 | continue; | |
163 | error("waitpid failed (%s)", strerror(errno)); | |
164 | return -ERR_RUN_COMMAND_WAITPID; | |
165 | } | |
166 | if (waiting != pid) | |
167 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; | |
168 | if (WIFSIGNALED(status)) | |
169 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
170 | ||
171 | if (!WIFEXITED(status)) | |
172 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
173 | code = WEXITSTATUS(status); | |
174 | switch (code) { | |
175 | case 127: | |
176 | return -ERR_RUN_COMMAND_EXEC; | |
177 | case 0: | |
178 | return 0; | |
179 | default: | |
180 | return -code; | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | int finish_command(struct child_process *cmd) | |
186 | { | |
187 | return wait_or_whine(cmd->pid); | |
188 | } | |
189 | ||
190 | int run_command(struct child_process *cmd) | |
191 | { | |
192 | int code = start_command(cmd); | |
193 | if (code) | |
194 | return code; | |
195 | return finish_command(cmd); | |
196 | } | |
197 | ||
198 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
199 | const char **argv, | |
200 | int opt) | |
201 | { | |
202 | memset(cmd, 0, sizeof(*cmd)); | |
203 | cmd->argv = argv; | |
204 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
205 | cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0; | |
206 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
207 | } | |
208 | ||
209 | int run_command_v_opt(const char **argv, int opt) | |
210 | { | |
211 | struct child_process cmd; | |
212 | prepare_run_command_v_opt(&cmd, argv, opt); | |
213 | return run_command(&cmd); | |
214 | } | |
215 | ||
216 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
217 | { | |
218 | struct child_process cmd; | |
219 | prepare_run_command_v_opt(&cmd, argv, opt); | |
220 | cmd.dir = dir; | |
221 | cmd.env = env; | |
222 | return run_command(&cmd); | |
223 | } | |
224 | ||
07800601 IM |
225 | int start_async(struct async *async) |
226 | { | |
227 | int pipe_out[2]; | |
228 | ||
229 | if (pipe(pipe_out) < 0) | |
230 | return error("cannot create pipe: %s", strerror(errno)); | |
231 | async->out = pipe_out[0]; | |
232 | ||
07800601 IM |
233 | /* Flush stdio before fork() to avoid cloning buffers */ |
234 | fflush(NULL); | |
235 | ||
236 | async->pid = fork(); | |
237 | if (async->pid < 0) { | |
238 | error("fork (async) failed: %s", strerror(errno)); | |
239 | close_pair(pipe_out); | |
240 | return -1; | |
241 | } | |
242 | if (!async->pid) { | |
243 | close(pipe_out[0]); | |
244 | exit(!!async->proc(pipe_out[1], async->data)); | |
245 | } | |
246 | close(pipe_out[1]); | |
fde953c1 | 247 | |
07800601 IM |
248 | return 0; |
249 | } | |
250 | ||
251 | int finish_async(struct async *async) | |
252 | { | |
07800601 IM |
253 | int ret = 0; |
254 | ||
255 | if (wait_or_whine(async->pid)) | |
256 | ret = error("waitpid (async) failed"); | |
fde953c1 | 257 | |
07800601 IM |
258 | return ret; |
259 | } | |
260 | ||
261 | int run_hook(const char *index_file, const char *name, ...) | |
262 | { | |
263 | struct child_process hook; | |
264 | const char **argv = NULL, *env[2]; | |
83a0944f | 265 | char idx[PATH_MAX]; |
07800601 IM |
266 | va_list args; |
267 | int ret; | |
268 | size_t i = 0, alloc = 0; | |
269 | ||
270 | if (access(perf_path("hooks/%s", name), X_OK) < 0) | |
271 | return 0; | |
272 | ||
273 | va_start(args, name); | |
274 | ALLOC_GROW(argv, i + 1, alloc); | |
275 | argv[i++] = perf_path("hooks/%s", name); | |
276 | while (argv[i-1]) { | |
277 | ALLOC_GROW(argv, i + 1, alloc); | |
278 | argv[i++] = va_arg(args, const char *); | |
279 | } | |
280 | va_end(args); | |
281 | ||
282 | memset(&hook, 0, sizeof(hook)); | |
283 | hook.argv = argv; | |
284 | hook.no_stdin = 1; | |
285 | hook.stdout_to_stderr = 1; | |
286 | if (index_file) { | |
83a0944f IM |
287 | snprintf(idx, sizeof(idx), "PERF_INDEX_FILE=%s", index_file); |
288 | env[0] = idx; | |
07800601 IM |
289 | env[1] = NULL; |
290 | hook.env = env; | |
291 | } | |
292 | ||
293 | ret = start_command(&hook); | |
294 | free(argv); | |
295 | if (ret) { | |
296 | warning("Could not spawn %s", argv[0]); | |
297 | return ret; | |
298 | } | |
299 | ret = finish_command(&hook); | |
300 | if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL) | |
301 | warning("%s exited due to uncaught signal", argv[0]); | |
302 | ||
303 | return ret; | |
304 | } |