run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include <sys/wait.h>
   4 #include "exec_cmd.h"
   5
   6 int run_command_v_opt(int argc, const char **argv, int flags)
   7 {
   8         pid_t pid = fork();
   9
  10         if (pid < 0)
  11                 return -ERR_RUN_COMMAND_FORK;
  12         if (!pid) {
  13                 if (flags & RUN_COMMAND_NO_STDIO) {
  14                         int fd = open("/dev/null", O_RDWR);
  15                         dup2(fd, 0);
  16                         dup2(fd, 1);
  17                         close(fd);
  18                 }
  19                 if (flags & RUN_GIT_CMD) {
  20                         execv_git_cmd(argv);
  21                 } else {
  22                         execvp(argv[0], (char *const*) argv);
  23                 }
  24                 die("exec %s failed.", 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(int argc, const char **argv)
  51 {
  52         return run_command_v_opt(argc, argv, 0);
  53 }
  54
  55 int run_command(const char *cmd, ...)
  56 {
  57         int argc;
  58         const char *argv[MAX_RUN_COMMAND_ARGS];
  59         const char *arg;
  60         va_list param;
  61
  62         va_start(param, cmd);
  63         argv[0] = (char*) cmd;
  64         argc = 1;
  65         while (argc < MAX_RUN_COMMAND_ARGS) {
  66                 arg = argv[argc++] = va_arg(param, char *);
  67                 if (!arg)
  68                         break;
  69         }
  70         va_end(param);
  71         if (MAX_RUN_COMMAND_ARGS <= argc)
  72                 return error("too many args to run %s", cmd);
  73         return run_command_v_opt(argc, argv, 0);
  74 }