run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include <sys/wait.h>
   4
   5 int run_command_v(int argc, char **argv)
   6 {
   7         pid_t pid = fork();
   8
   9         if (pid < 0)
  10                 return -ERR_RUN_COMMAND_FORK;
  11         if (!pid) {
  12                 execvp(argv[0], (char *const*) argv);
  13                 die("exec %s failed.", argv[0]);
  14         }
  15         for (;;) {
  16                 int status, code;
  17                 int retval = waitpid(pid, &status, 0);
  18
  19                 if (retval < 0) {
  20                         if (errno == EINTR)
  21                                 continue;
  22                         error("waitpid failed (%s)", strerror(retval));
  23                         return -ERR_RUN_COMMAND_WAITPID;
  24                 }
  25                 if (retval != pid)
  26                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  27                 if (WIFSIGNALED(status))
  28                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  29
  30                 if (!WIFEXITED(status))
  31                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  32                 code = WEXITSTATUS(status);
  33                 if (code)
  34                         return -code;
  35                 return 0;
  36         }
  37 }
  38
  39 int run_command(const char *cmd, ...)
  40 {
  41         int argc;
  42         char *argv[MAX_RUN_COMMAND_ARGS];
  43         const char *arg;
  44         va_list param;
  45
  46         va_start(param, cmd);
  47         argv[0] = (char*) cmd;
  48         argc = 1;
  49         while (argc < MAX_RUN_COMMAND_ARGS) {
  50                 arg = argv[argc++] = va_arg(param, char *);
  51                 if (!arg)
  52                         break;
  53         }
  54         va_end(param);
  55         if (MAX_RUN_COMMAND_ARGS <= argc)
  56                 return error("too many args to run %s", cmd);
  57         return run_command_v(argc, argv);
  58 }