run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "exec_cmd.h"
   4
   5 int run_command(struct child_process *cmd)
   6 {
   7         pid_t pid = fork();
   8
   9         if (pid < 0)
  10                 return -ERR_RUN_COMMAND_FORK;
  11         if (!pid) {
  12                 if (cmd->no_stdin) {
  13                         int fd = open("/dev/null", O_RDWR);
  14                         dup2(fd, 0);
  15                         close(fd);
  16                 }
  17                 if (cmd->stdout_to_stderr)
  18                         dup2(2, 1);
  19                 if (cmd->git_cmd) {
  20                         execv_git_cmd(cmd->argv);
  21                 } else {
  22                         execvp(cmd->argv[0], (char *const*) cmd->argv);
  23                 }
  24                 die("exec %s failed.", cmd->argv[0]);
  25         }
  26         for (;;) {
  27                 int status, code;
  28                 pid_t waiting = waitpid(pid, &status, 0);
  29
  30                 if (waiting < 0) {
  31                         if (errno == EINTR)
  32                                 continue;
  33                         error("waitpid failed (%s)", strerror(errno));
  34                         return -ERR_RUN_COMMAND_WAITPID;
  35                 }
  36                 if (waiting != pid)
  37                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  38                 if (WIFSIGNALED(status))
  39                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  40
  41                 if (!WIFEXITED(status))
  42                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  43                 code = WEXITSTATUS(status);
  44                 if (code)
  45                         return -code;
  46                 return 0;
  47         }
  48 }
  49
  50 int run_command_v_opt(const char **argv, int opt)
  51 {
  52         struct child_process cmd;
  53         memset(&cmd, 0, sizeof(cmd));
  54         cmd.argv = argv;
  55         cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
  56         cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
  57         cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
  58         return run_command(&cmd);
  59 }