run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "exec_cmd.h"
   4
   5 int run_command_v_opt(int argc, const char **argv, int flags)
   6 {
   7         pid_t pid = fork();
   8
   9         if (pid < 0)
  10                 return -ERR_RUN_COMMAND_FORK;
  11         if (!pid) {
  12                 if (flags & RUN_COMMAND_NO_STDIO) {
  13                         int fd = open("/dev/null", O_RDWR);
  14                         dup2(fd, 0);
  15                         dup2(fd, 1);
  16                         close(fd);
  17                 }
  18                 if (flags & RUN_GIT_CMD) {
  19                         execv_git_cmd(argv);
  20                 } else {
  21                         execvp(argv[0], (char *const*) argv);
  22                 }
  23                 die("exec %s failed.", argv[0]);
  24         }
  25         for (;;) {
  26                 int status, code;
  27                 pid_t waiting = waitpid(pid, &status, 0);
  28
  29                 if (waiting < 0) {
  30                         if (errno == EINTR)
  31                                 continue;
  32                         error("waitpid failed (%s)", strerror(errno));
  33                         return -ERR_RUN_COMMAND_WAITPID;
  34                 }
  35                 if (waiting != pid)
  36                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  37                 if (WIFSIGNALED(status))
  38                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  39
  40                 if (!WIFEXITED(status))
  41                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  42                 code = WEXITSTATUS(status);
  43                 if (code)
  44                         return -code;
  45                 return 0;
  46         }
  47 }
  48
  49 int run_command_v(int argc, const char **argv)
  50 {
  51         return run_command_v_opt(argc, argv, 0);
  52 }
  53
  54 int run_command(const char *cmd, ...)
  55 {
  56         int argc;
  57         const char *argv[MAX_RUN_COMMAND_ARGS];
  58         const char *arg;
  59         va_list param;
  60
  61         va_start(param, cmd);
  62         argv[0] = (char*) cmd;
  63         argc = 1;
  64         while (argc < MAX_RUN_COMMAND_ARGS) {
  65                 arg = argv[argc++] = va_arg(param, char *);
  66                 if (!arg)
  67                         break;
  68         }
  69         va_end(param);
  70         if (MAX_RUN_COMMAND_ARGS <= argc)
  71                 return error("too many args to run %s", cmd);
  72         return run_command_v_opt(argc, argv, 0);
  73 }