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-rw-r--r--Documentation/perf_counter/run-command.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/Documentation/perf_counter/run-command.c b/Documentation/perf_counter/run-command.c
new file mode 100644
index 000000000000..b2f5e854f40a
--- /dev/null
+++ b/Documentation/perf_counter/run-command.c
@@ -0,0 +1,395 @@
1#include "cache.h"
2#include "run-command.h"
3#include "exec_cmd.h"
4
5static inline void close_pair(int fd[2])
6{
7 close(fd[0]);
8 close(fd[1]);
9}
10
11static inline void dup_devnull(int to)
12{
13 int fd = open("/dev/null", O_RDWR);
14 dup2(fd, to);
15 close(fd);
16}
17
18int 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
68#ifndef __MINGW32__
69 fflush(NULL);
70 cmd->pid = fork();
71 if (!cmd->pid) {
72 if (cmd->no_stdin)
73 dup_devnull(0);
74 else if (need_in) {
75 dup2(fdin[0], 0);
76 close_pair(fdin);
77 } else if (cmd->in) {
78 dup2(cmd->in, 0);
79 close(cmd->in);
80 }
81
82 if (cmd->no_stderr)
83 dup_devnull(2);
84 else if (need_err) {
85 dup2(fderr[1], 2);
86 close_pair(fderr);
87 }
88
89 if (cmd->no_stdout)
90 dup_devnull(1);
91 else if (cmd->stdout_to_stderr)
92 dup2(2, 1);
93 else if (need_out) {
94 dup2(fdout[1], 1);
95 close_pair(fdout);
96 } else if (cmd->out > 1) {
97 dup2(cmd->out, 1);
98 close(cmd->out);
99 }
100
101 if (cmd->dir && chdir(cmd->dir))
102 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
103 cmd->dir, strerror(errno));
104 if (cmd->env) {
105 for (; *cmd->env; cmd->env++) {
106 if (strchr(*cmd->env, '='))
107 putenv((char*)*cmd->env);
108 else
109 unsetenv(*cmd->env);
110 }
111 }
112 if (cmd->preexec_cb)
113 cmd->preexec_cb();
114 if (cmd->perf_cmd) {
115 execv_perf_cmd(cmd->argv);
116 } else {
117 execvp(cmd->argv[0], (char *const*) cmd->argv);
118 }
119 exit(127);
120 }
121#else
122 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
123 const char **sargv = cmd->argv;
124 char **env = environ;
125
126 if (cmd->no_stdin) {
127 s0 = dup(0);
128 dup_devnull(0);
129 } else if (need_in) {
130 s0 = dup(0);
131 dup2(fdin[0], 0);
132 } else if (cmd->in) {
133 s0 = dup(0);
134 dup2(cmd->in, 0);
135 }
136
137 if (cmd->no_stderr) {
138 s2 = dup(2);
139 dup_devnull(2);
140 } else if (need_err) {
141 s2 = dup(2);
142 dup2(fderr[1], 2);
143 }
144
145 if (cmd->no_stdout) {
146 s1 = dup(1);
147 dup_devnull(1);
148 } else if (cmd->stdout_to_stderr) {
149 s1 = dup(1);
150 dup2(2, 1);
151 } else if (need_out) {
152 s1 = dup(1);
153 dup2(fdout[1], 1);
154 } else if (cmd->out > 1) {
155 s1 = dup(1);
156 dup2(cmd->out, 1);
157 }
158
159 if (cmd->dir)
160 die("chdir in start_command() not implemented");
161 if (cmd->env) {
162 env = copy_environ();
163 for (; *cmd->env; cmd->env++)
164 env = env_setenv(env, *cmd->env);
165 }
166
167 if (cmd->perf_cmd) {
168 cmd->argv = prepare_perf_cmd(cmd->argv);
169 }
170
171 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
172
173 if (cmd->env)
174 free_environ(env);
175 if (cmd->perf_cmd)
176 free(cmd->argv);
177
178 cmd->argv = sargv;
179 if (s0 >= 0)
180 dup2(s0, 0), close(s0);
181 if (s1 >= 0)
182 dup2(s1, 1), close(s1);
183 if (s2 >= 0)
184 dup2(s2, 2), close(s2);
185#endif
186
187 if (cmd->pid < 0) {
188 int err = errno;
189 if (need_in)
190 close_pair(fdin);
191 else if (cmd->in)
192 close(cmd->in);
193 if (need_out)
194 close_pair(fdout);
195 else if (cmd->out)
196 close(cmd->out);
197 if (need_err)
198 close_pair(fderr);
199 return err == ENOENT ?
200 -ERR_RUN_COMMAND_EXEC :
201 -ERR_RUN_COMMAND_FORK;
202 }
203
204 if (need_in)
205 close(fdin[0]);
206 else if (cmd->in)
207 close(cmd->in);
208
209 if (need_out)
210 close(fdout[1]);
211 else if (cmd->out)
212 close(cmd->out);
213
214 if (need_err)
215 close(fderr[1]);
216
217 return 0;
218}
219
220static int wait_or_whine(pid_t pid)
221{
222 for (;;) {
223 int status, code;
224 pid_t waiting = waitpid(pid, &status, 0);
225
226 if (waiting < 0) {
227 if (errno == EINTR)
228 continue;
229 error("waitpid failed (%s)", strerror(errno));
230 return -ERR_RUN_COMMAND_WAITPID;
231 }
232 if (waiting != pid)
233 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
234 if (WIFSIGNALED(status))
235 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
236
237 if (!WIFEXITED(status))
238 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
239 code = WEXITSTATUS(status);
240 switch (code) {
241 case 127:
242 return -ERR_RUN_COMMAND_EXEC;
243 case 0:
244 return 0;
245 default:
246 return -code;
247 }
248 }
249}
250
251int finish_command(struct child_process *cmd)
252{
253 return wait_or_whine(cmd->pid);
254}
255
256int run_command(struct child_process *cmd)
257{
258 int code = start_command(cmd);
259 if (code)
260 return code;
261 return finish_command(cmd);
262}
263
264static void prepare_run_command_v_opt(struct child_process *cmd,
265 const char **argv,
266 int opt)
267{
268 memset(cmd, 0, sizeof(*cmd));
269 cmd->argv = argv;
270 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
271 cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;
272 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
273}
274
275int run_command_v_opt(const char **argv, int opt)
276{
277 struct child_process cmd;
278 prepare_run_command_v_opt(&cmd, argv, opt);
279 return run_command(&cmd);
280}
281
282int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
283{
284 struct child_process cmd;
285 prepare_run_command_v_opt(&cmd, argv, opt);
286 cmd.dir = dir;
287 cmd.env = env;
288 return run_command(&cmd);
289}
290
291#ifdef __MINGW32__
292static __stdcall unsigned run_thread(void *data)
293{
294 struct async *async = data;
295 return async->proc(async->fd_for_proc, async->data);
296}
297#endif
298
299int start_async(struct async *async)
300{
301 int pipe_out[2];
302
303 if (pipe(pipe_out) < 0)
304 return error("cannot create pipe: %s", strerror(errno));
305 async->out = pipe_out[0];
306
307#ifndef __MINGW32__
308 /* Flush stdio before fork() to avoid cloning buffers */
309 fflush(NULL);
310
311 async->pid = fork();
312 if (async->pid < 0) {
313 error("fork (async) failed: %s", strerror(errno));
314 close_pair(pipe_out);
315 return -1;
316 }
317 if (!async->pid) {
318 close(pipe_out[0]);
319 exit(!!async->proc(pipe_out[1], async->data));
320 }
321 close(pipe_out[1]);
322#else
323 async->fd_for_proc = pipe_out[1];
324 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
325 if (!async->tid) {
326 error("cannot create thread: %s", strerror(errno));
327 close_pair(pipe_out);
328 return -1;
329 }
330#endif
331 return 0;
332}
333
334int finish_async(struct async *async)
335{
336#ifndef __MINGW32__
337 int ret = 0;
338
339 if (wait_or_whine(async->pid))
340 ret = error("waitpid (async) failed");
341#else
342 DWORD ret = 0;
343 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
344 ret = error("waiting for thread failed: %lu", GetLastError());
345 else if (!GetExitCodeThread(async->tid, &ret))
346 ret = error("cannot get thread exit code: %lu", GetLastError());
347 CloseHandle(async->tid);
348#endif
349 return ret;
350}
351
352int run_hook(const char *index_file, const char *name, ...)
353{
354 struct child_process hook;
355 const char **argv = NULL, *env[2];
356 char index[PATH_MAX];
357 va_list args;
358 int ret;
359 size_t i = 0, alloc = 0;
360
361 if (access(perf_path("hooks/%s", name), X_OK) < 0)
362 return 0;
363
364 va_start(args, name);
365 ALLOC_GROW(argv, i + 1, alloc);
366 argv[i++] = perf_path("hooks/%s", name);
367 while (argv[i-1]) {
368 ALLOC_GROW(argv, i + 1, alloc);
369 argv[i++] = va_arg(args, const char *);
370 }
371 va_end(args);
372
373 memset(&hook, 0, sizeof(hook));
374 hook.argv = argv;
375 hook.no_stdin = 1;
376 hook.stdout_to_stderr = 1;
377 if (index_file) {
378 snprintf(index, sizeof(index), "PERF_INDEX_FILE=%s", index_file);
379 env[0] = index;
380 env[1] = NULL;
381 hook.env = env;
382 }
383
384 ret = start_command(&hook);
385 free(argv);
386 if (ret) {
387 warning("Could not spawn %s", argv[0]);
388 return ret;
389 }
390 ret = finish_command(&hook);
391 if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
392 warning("%s exited due to uncaught signal", argv[0]);
393
394 return ret;
395}
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