4919bf0354
Sometimes callers trying to use run_command to execute a child process will want to setup a pipe or file descriptor to redirect into the child's stdin. This idea is completely stolen from builtin-bundle's fork_with_pipe, written by Johannes Schindelin. All credit (and blame) should lie with Dscho. ;-) Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
105 lines
2.0 KiB
C
105 lines
2.0 KiB
C
#include "cache.h"
|
|
#include "run-command.h"
|
|
#include "exec_cmd.h"
|
|
|
|
int start_command(struct child_process *cmd)
|
|
{
|
|
int need_in = !cmd->no_stdin && cmd->in < 0;
|
|
int fdin[2];
|
|
|
|
if (need_in) {
|
|
if (pipe(fdin) < 0)
|
|
return -ERR_RUN_COMMAND_PIPE;
|
|
cmd->in = fdin[1];
|
|
cmd->close_in = 1;
|
|
}
|
|
|
|
cmd->pid = fork();
|
|
if (cmd->pid < 0) {
|
|
if (need_in) {
|
|
close(fdin[0]);
|
|
close(fdin[1]);
|
|
}
|
|
return -ERR_RUN_COMMAND_FORK;
|
|
}
|
|
|
|
if (!cmd->pid) {
|
|
if (cmd->no_stdin) {
|
|
int fd = open("/dev/null", O_RDWR);
|
|
dup2(fd, 0);
|
|
close(fd);
|
|
} else if (need_in) {
|
|
dup2(fdin[0], 0);
|
|
close(fdin[0]);
|
|
close(fdin[1]);
|
|
} else if (cmd->in) {
|
|
dup2(cmd->in, 0);
|
|
close(cmd->in);
|
|
}
|
|
|
|
if (cmd->stdout_to_stderr)
|
|
dup2(2, 1);
|
|
if (cmd->git_cmd) {
|
|
execv_git_cmd(cmd->argv);
|
|
} else {
|
|
execvp(cmd->argv[0], (char *const*) cmd->argv);
|
|
}
|
|
die("exec %s failed.", cmd->argv[0]);
|
|
}
|
|
|
|
if (need_in)
|
|
close(fdin[0]);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int finish_command(struct child_process *cmd)
|
|
{
|
|
if (cmd->close_in)
|
|
close(cmd->in);
|
|
|
|
for (;;) {
|
|
int status, code;
|
|
pid_t waiting = waitpid(cmd->pid, &status, 0);
|
|
|
|
if (waiting < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
error("waitpid failed (%s)", strerror(errno));
|
|
return -ERR_RUN_COMMAND_WAITPID;
|
|
}
|
|
if (waiting != cmd->pid)
|
|
return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
|
|
if (WIFSIGNALED(status))
|
|
return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
|
|
|
|
if (!WIFEXITED(status))
|
|
return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
|
|
code = WEXITSTATUS(status);
|
|
if (code)
|
|
return -code;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int run_command(struct child_process *cmd)
|
|
{
|
|
int code = start_command(cmd);
|
|
if (code)
|
|
return code;
|
|
return finish_command(cmd);
|
|
}
|
|
|
|
int run_command_v_opt(const char **argv, int opt)
|
|
{
|
|
struct child_process cmd;
|
|
memset(&cmd, 0, sizeof(cmd));
|
|
cmd.argv = argv;
|
|
cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
|
|
cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
|
|
cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
|
|
return run_command(&cmd);
|
|
}
|