Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "run-command.h"
   3#include "exec_cmd.h"
   4
   5int start_command(struct child_process *cmd)
   6{
   7        int need_in = !cmd->no_stdin && cmd->in < 0;
   8        int fdin[2];
   9
  10        if (need_in) {
  11                if (pipe(fdin) < 0)
  12                        return -ERR_RUN_COMMAND_PIPE;
  13                cmd->in = fdin[1];
  14                cmd->close_in = 1;
  15        }
  16
  17        cmd->pid = fork();
  18        if (cmd->pid < 0) {
  19                if (need_in) {
  20                        close(fdin[0]);
  21                        close(fdin[1]);
  22                }
  23                return -ERR_RUN_COMMAND_FORK;
  24        }
  25
  26        if (!cmd->pid) {
  27                if (cmd->no_stdin) {
  28                        int fd = open("/dev/null", O_RDWR);
  29                        dup2(fd, 0);
  30                        close(fd);
  31                } else if (need_in) {
  32                        dup2(fdin[0], 0);
  33                        close(fdin[0]);
  34                        close(fdin[1]);
  35                } else if (cmd->in) {
  36                        dup2(cmd->in, 0);
  37                        close(cmd->in);
  38                }
  39
  40                if (cmd->stdout_to_stderr)
  41                        dup2(2, 1);
  42                if (cmd->git_cmd) {
  43                        execv_git_cmd(cmd->argv);
  44                } else {
  45                        execvp(cmd->argv[0], (char *const*) cmd->argv);
  46                }
  47                die("exec %s failed.", cmd->argv[0]);
  48        }
  49
  50        if (need_in)
  51                close(fdin[0]);
  52        else if (cmd->in)
  53                close(cmd->in);
  54
  55        return 0;
  56}
  57
  58int finish_command(struct child_process *cmd)
  59{
  60        if (cmd->close_in)
  61                close(cmd->in);
  62
  63        for (;;) {
  64                int status, code;
  65                pid_t waiting = waitpid(cmd->pid, &status, 0);
  66
  67                if (waiting < 0) {
  68                        if (errno == EINTR)
  69                                continue;
  70                        error("waitpid failed (%s)", strerror(errno));
  71                        return -ERR_RUN_COMMAND_WAITPID;
  72                }
  73                if (waiting != cmd->pid)
  74                        return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  75                if (WIFSIGNALED(status))
  76                        return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  77
  78                if (!WIFEXITED(status))
  79                        return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  80                code = WEXITSTATUS(status);
  81                if (code)
  82                        return -code;
  83                return 0;
  84        }
  85}
  86
  87int run_command(struct child_process *cmd)
  88{
  89        int code = start_command(cmd);
  90        if (code)
  91                return code;
  92        return finish_command(cmd);
  93}
  94
  95int run_command_v_opt(const char **argv, int opt)
  96{
  97        struct child_process cmd;
  98        memset(&cmd, 0, sizeof(cmd));
  99        cmd.argv = argv;
 100        cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 101        cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 102        cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 103        return run_command(&cmd);
 104}