run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "exec_cmd.h"
   4
   5 int start_command(struct child_process *cmd)
   6 {
   7         cmd->pid = fork();
   8         if (cmd->pid < 0)
   9                 return -ERR_RUN_COMMAND_FORK;
  10         if (!cmd->pid) {
  11                 if (cmd->no_stdin) {
  12                         int fd = open("/dev/null", O_RDWR);
  13                         dup2(fd, 0);
  14                         close(fd);
  15                 }
  16                 if (cmd->stdout_to_stderr)
  17                         dup2(2, 1);
  18                 if (cmd->git_cmd) {
  19                         execv_git_cmd(cmd->argv);
  20                 } else {
  21                         execvp(cmd->argv[0], (char *const*) cmd->argv);
  22                 }
  23                 die("exec %s failed.", cmd->argv[0]);
  24         }
  25         return 0;
  26 }
  27
  28 int finish_command(struct child_process *cmd)
  29 {
  30         for (;;) {
  31                 int status, code;
  32                 pid_t waiting = waitpid(cmd->pid, &status, 0);
  33
  34                 if (waiting < 0) {
  35                         if (errno == EINTR)
  36                                 continue;
  37                         error("waitpid failed (%s)", strerror(errno));
  38                         return -ERR_RUN_COMMAND_WAITPID;
  39                 }
  40                 if (waiting != cmd->pid)
  41                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  42                 if (WIFSIGNALED(status))
  43                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  44
  45                 if (!WIFEXITED(status))
  46                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  47                 code = WEXITSTATUS(status);
  48                 if (code)
  49                         return -code;
  50                 return 0;
  51         }
  52 }
  53
  54 int run_command(struct child_process *cmd)
  55 {
  56         int code = start_command(cmd);
  57         if (code)
  58                 return code;
  59         return finish_command(cmd);
  60 }
  61
  62 int run_command_v_opt(const char **argv, int opt)
  63 {
  64         struct child_process cmd;
  65         memset(&cmd, 0, sizeof(cmd));
  66         cmd.argv = argv;
  67         cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
  68         cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
  69         cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
  70         return run_command(&cmd);
  71 }