Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "run-command.h"
   3#include "exec_cmd.h"
   4
   5static inline void close_pair(int fd[2])
   6{
   7        close(fd[0]);
   8        close(fd[1]);
   9}
  10
  11int start_command(struct child_process *cmd)
  12{
  13        int need_in = !cmd->no_stdin && cmd->in < 0;
  14        int fdin[2];
  15
  16        if (need_in) {
  17                if (pipe(fdin) < 0)
  18                        return -ERR_RUN_COMMAND_PIPE;
  19                cmd->in = fdin[1];
  20                cmd->close_in = 1;
  21        }
  22
  23        cmd->pid = fork();
  24        if (cmd->pid < 0) {
  25                if (need_in)
  26                        close_pair(fdin);
  27                return -ERR_RUN_COMMAND_FORK;
  28        }
  29
  30        if (!cmd->pid) {
  31                if (cmd->no_stdin) {
  32                        int fd = open("/dev/null", O_RDWR);
  33                        dup2(fd, 0);
  34                        close(fd);
  35                } else if (need_in) {
  36                        dup2(fdin[0], 0);
  37                        close_pair(fdin);
  38                } else if (cmd->in) {
  39                        dup2(cmd->in, 0);
  40                        close(cmd->in);
  41                }
  42
  43                if (cmd->stdout_to_stderr)
  44                        dup2(2, 1);
  45                if (cmd->git_cmd) {
  46                        execv_git_cmd(cmd->argv);
  47                } else {
  48                        execvp(cmd->argv[0], (char *const*) cmd->argv);
  49                }
  50                die("exec %s failed.", cmd->argv[0]);
  51        }
  52
  53        if (need_in)
  54                close(fdin[0]);
  55        else if (cmd->in)
  56                close(cmd->in);
  57
  58        return 0;
  59}
  60
  61int finish_command(struct child_process *cmd)
  62{
  63        if (cmd->close_in)
  64                close(cmd->in);
  65
  66        for (;;) {
  67                int status, code;
  68                pid_t waiting = waitpid(cmd->pid, &status, 0);
  69
  70                if (waiting < 0) {
  71                        if (errno == EINTR)
  72                                continue;
  73                        error("waitpid failed (%s)", strerror(errno));
  74                        return -ERR_RUN_COMMAND_WAITPID;
  75                }
  76                if (waiting != cmd->pid)
  77                        return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
  78                if (WIFSIGNALED(status))
  79                        return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
  80
  81                if (!WIFEXITED(status))
  82                        return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
  83                code = WEXITSTATUS(status);
  84                if (code)
  85                        return -code;
  86                return 0;
  87        }
  88}
  89
  90int run_command(struct child_process *cmd)
  91{
  92        int code = start_command(cmd);
  93        if (code)
  94                return code;
  95        return finish_command(cmd);
  96}
  97
  98int run_command_v_opt(const char **argv, int opt)
  99{
 100        struct child_process cmd;
 101        memset(&cmd, 0, sizeof(cmd));
 102        cmd.argv = argv;
 103        cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 104        cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 105        cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 106        return run_command(&cmd);
 107}