run-command.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "exec_cmd.h"
   4 #include "spawn-pipe.h"
   5
   6 int run_command_v_opt(const char **argv, int flags)
   7 {
   8         pid_t pid;
   9         int fd_i[2] = { -1, -1 };
  10         int fd_o[2] = { -1, -1 };
  11
  12         if (flags & RUN_COMMAND_NO_STDIN) {
  13 #ifndef __MINGW32__
  14                 fd_i[0] = open("/dev/null", O_RDWR);
  15 #else
  16                 fd_i[0] = open("nul", O_RDWR);
  17 #endif
  18         }
  19         if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
  20                 fd_o[1] = dup(2);
  21
  22         if (flags & RUN_GIT_CMD) {
  23                 pid = spawnv_git_cmd(argv, fd_i, fd_o);
  24         } else {
  25                 pid = spawnvpe_pipe(argv[0], argv, environ, fd_i, fd_o);
  26         }
  27         if (pid < 0)
  28                 return -ERR_RUN_COMMAND_FORK;
  29         for (;;) {
  30                 int status, code;
  31                 pid_t waiting = waitpid(pid, &status, 0);
  32
  33                 if (waiting < 0) {
  34                         if (errno == EINTR)
  35                                 continue;
  36                         error("waitpid failed (%s)", strerror(errno));
  37                         return -ERR_RUN_COMMAND_WAITPID;
  38                 }
  39                 if (waiting != pid)
  40                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  41                 if (WIFSIGNALED(status))
  42                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  43
  44                 if (!WIFEXITED(status))
  45                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  46                 code = WEXITSTATUS(status);
  47                 if (code)
  48                         return -code;
  49                 return 0;
  50         }
  51 }
  52
  53 int run_command_v(const char **argv)
  54 {
  55         return run_command_v_opt(argv, 0);
  56 }
  57
  58 static int run_command_va_opt(int opt, const char *cmd, va_list param)
  59 {
  60         int argc;
  61         const char *argv[MAX_RUN_COMMAND_ARGS];
  62         const char *arg;
  63
  64         argv[0] = (char*) cmd;
  65         argc = 1;
  66         while (argc < MAX_RUN_COMMAND_ARGS) {
  67                 arg = argv[argc++] = va_arg(param, char *);
  68                 if (!arg)
  69                         break;
  70         }
  71         if (MAX_RUN_COMMAND_ARGS <= argc)
  72                 return error("too many args to run %s", cmd);
  73         return run_command_v_opt(argv, opt);
  74 }
  75
  76 int run_command_opt(int opt, const char *cmd, ...)
  77 {
  78         va_list params;
  79         int r;
  80
  81         va_start(params, cmd);
  82         r = run_command_va_opt(opt, cmd, params);
  83         va_end(params);
  84         return r;
  85 }
  86
  87 int run_command(const char *cmd, ...)
  88 {
  89         va_list params;
  90         int r;
  91
  92         va_start(params, cmd);
  93         r = run_command_va_opt(0, cmd, params);
  94         va_end(params);
  95         return r;
  96 }