6 #include <linux/string.h>
9 #include "subcmd-util.h"
10 #include "run-command.h"
13 #define STRERR_BUFSIZE 128
15 static inline void close_pair(int fd[2])
21 static inline void dup_devnull(int to)
23 int fd = open("/dev/null", O_RDWR);
28 int start_command(struct child_process *cmd)
30 int need_in, need_out, need_err;
31 int fdin[2], fdout[2], fderr[2];
32 char sbuf[STRERR_BUFSIZE];
35 * In case of errors we must keep the promise to close FDs
36 * that have been passed in via ->in and ->out.
39 need_in = !cmd->no_stdin && cmd->in < 0;
44 return -ERR_RUN_COMMAND_PIPE;
49 need_out = !cmd->no_stdout
50 && !cmd->stdout_to_stderr
53 if (pipe(fdout) < 0) {
58 return -ERR_RUN_COMMAND_PIPE;
63 need_err = !cmd->no_stderr && cmd->err < 0;
65 if (pipe(fderr) < 0) {
74 return -ERR_RUN_COMMAND_PIPE;
101 else if (cmd->stdout_to_stderr)
106 } else if (cmd->out > 1) {
111 if (cmd->dir && chdir(cmd->dir))
112 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
113 cmd->dir, str_error_r(errno, sbuf, sizeof(sbuf)));
115 for (; *cmd->env; cmd->env++) {
116 if (strchr(*cmd->env, '='))
117 putenv((char*)*cmd->env);
125 execv_cmd(cmd->argv);
127 execvp(cmd->argv[0], (char *const*) cmd->argv);
144 return err == ENOENT ?
145 -ERR_RUN_COMMAND_EXEC :
146 -ERR_RUN_COMMAND_FORK;
165 static int wait_or_whine(pid_t pid)
167 char sbuf[STRERR_BUFSIZE];
171 pid_t waiting = waitpid(pid, &status, 0);
176 fprintf(stderr, " Error: waitpid failed (%s)",
177 str_error_r(errno, sbuf, sizeof(sbuf)));
178 return -ERR_RUN_COMMAND_WAITPID;
181 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
182 if (WIFSIGNALED(status))
183 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
185 if (!WIFEXITED(status))
186 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
187 code = WEXITSTATUS(status);
190 return -ERR_RUN_COMMAND_EXEC;
199 int finish_command(struct child_process *cmd)
201 return wait_or_whine(cmd->pid);
204 int run_command(struct child_process *cmd)
206 int code = start_command(cmd);
209 return finish_command(cmd);
212 static void prepare_run_command_v_opt(struct child_process *cmd,
216 memset(cmd, 0, sizeof(*cmd));
218 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
219 cmd->exec_cmd = opt & RUN_EXEC_CMD ? 1 : 0;
220 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
223 int run_command_v_opt(const char **argv, int opt)
225 struct child_process cmd;
226 prepare_run_command_v_opt(&cmd, argv, opt);
227 return run_command(&cmd);