2 #include "run-command.h"
5 static inline void close_pair(int fd[2])
11 static inline void dup_devnull(int to)
13 int fd = open("/dev/null", O_RDWR);
18 int start_command(struct child_process *cmd)
20 int need_in, need_out, need_err;
21 int fdin[2], fdout[2], fderr[2];
24 * In case of errors we must keep the promise to close FDs
25 * that have been passed in via ->in and ->out.
28 need_in = !cmd->no_stdin && cmd->in < 0;
33 return -ERR_RUN_COMMAND_PIPE;
38 need_out = !cmd->no_stdout
39 && !cmd->stdout_to_stderr
42 if (pipe(fdout) < 0) {
47 return -ERR_RUN_COMMAND_PIPE;
52 need_err = !cmd->no_stderr && cmd->err < 0;
54 if (pipe(fderr) < 0) {
63 return -ERR_RUN_COMMAND_PIPE;
91 else if (cmd->stdout_to_stderr)
96 } else if (cmd->out > 1) {
101 if (cmd->dir && chdir(cmd->dir))
102 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
103 cmd->dir, strerror(errno));
105 for (; *cmd->env; cmd->env++) {
106 if (strchr(*cmd->env, '='))
107 putenv((char*)*cmd->env);
115 execv_perf_cmd(cmd->argv);
117 execvp(cmd->argv[0], (char *const*) cmd->argv);
122 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
123 const char **sargv = cmd->argv;
124 char **env = environ;
129 } else if (need_in) {
132 } else if (cmd->in) {
137 if (cmd->no_stderr) {
140 } else if (need_err) {
145 if (cmd->no_stdout) {
148 } else if (cmd->stdout_to_stderr) {
151 } else if (need_out) {
154 } else if (cmd->out > 1) {
160 die("chdir in start_command() not implemented");
162 env = copy_environ();
163 for (; *cmd->env; cmd->env++)
164 env = env_setenv(env, *cmd->env);
168 cmd->argv = prepare_perf_cmd(cmd->argv);
171 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
180 dup2(s0, 0), close(s0);
182 dup2(s1, 1), close(s1);
184 dup2(s2, 2), close(s2);
199 return err == ENOENT ?
200 -ERR_RUN_COMMAND_EXEC :
201 -ERR_RUN_COMMAND_FORK;
220 static int wait_or_whine(pid_t pid)
224 pid_t waiting = waitpid(pid, &status, 0);
229 error("waitpid failed (%s)", strerror(errno));
230 return -ERR_RUN_COMMAND_WAITPID;
233 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
234 if (WIFSIGNALED(status))
235 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
237 if (!WIFEXITED(status))
238 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
239 code = WEXITSTATUS(status);
242 return -ERR_RUN_COMMAND_EXEC;
251 int finish_command(struct child_process *cmd)
253 return wait_or_whine(cmd->pid);
256 int run_command(struct child_process *cmd)
258 int code = start_command(cmd);
261 return finish_command(cmd);
264 static void prepare_run_command_v_opt(struct child_process *cmd,
268 memset(cmd, 0, sizeof(*cmd));
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;
275 int run_command_v_opt(const char **argv, int opt)
277 struct child_process cmd;
278 prepare_run_command_v_opt(&cmd, argv, opt);
279 return run_command(&cmd);
282 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
284 struct child_process cmd;
285 prepare_run_command_v_opt(&cmd, argv, opt);
288 return run_command(&cmd);
292 static __stdcall unsigned run_thread(void *data)
294 struct async *async = data;
295 return async->proc(async->fd_for_proc, async->data);
299 int start_async(struct async *async)
303 if (pipe(pipe_out) < 0)
304 return error("cannot create pipe: %s", strerror(errno));
305 async->out = pipe_out[0];
308 /* Flush stdio before fork() to avoid cloning buffers */
312 if (async->pid < 0) {
313 error("fork (async) failed: %s", strerror(errno));
314 close_pair(pipe_out);
319 exit(!!async->proc(pipe_out[1], async->data));
323 async->fd_for_proc = pipe_out[1];
324 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
326 error("cannot create thread: %s", strerror(errno));
327 close_pair(pipe_out);
334 int finish_async(struct async *async)
339 if (wait_or_whine(async->pid))
340 ret = error("waitpid (async) failed");
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);
352 int run_hook(const char *index_file, const char *name, ...)
354 struct child_process hook;
355 const char **argv = NULL, *env[2];
356 char index[PATH_MAX];
359 size_t i = 0, alloc = 0;
361 if (access(perf_path("hooks/%s", name), X_OK) < 0)
364 va_start(args, name);
365 ALLOC_GROW(argv, i + 1, alloc);
366 argv[i++] = perf_path("hooks/%s", name);
368 ALLOC_GROW(argv, i + 1, alloc);
369 argv[i++] = va_arg(args, const char *);
373 memset(&hook, 0, sizeof(hook));
376 hook.stdout_to_stderr = 1;
378 snprintf(index, sizeof(index), "PERF_INDEX_FILE=%s", index_file);
384 ret = start_command(&hook);
387 warning("Could not spawn %s", argv[0]);
390 ret = finish_command(&hook);
391 if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
392 warning("%s exited due to uncaught signal", argv[0]);