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e4507ae84e
Some run-command callers may wish to just discard any data that is sent to stdout from the child. This is a lot like our existing no_stdin support, we just open /dev/null and duplicate the descriptor into position. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
145 lines
2.7 KiB
C
145 lines
2.7 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "exec_cmd.h"
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static inline void close_pair(int fd[2])
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{
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close(fd[0]);
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close(fd[1]);
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}
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static inline void dup_devnull(int to)
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{
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int fd = open("/dev/null", O_RDWR);
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dup2(fd, to);
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close(fd);
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}
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int start_command(struct child_process *cmd)
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{
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int need_in, need_out;
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int fdin[2], fdout[2];
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need_in = !cmd->no_stdin && cmd->in < 0;
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if (need_in) {
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if (pipe(fdin) < 0)
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return -ERR_RUN_COMMAND_PIPE;
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cmd->in = fdin[1];
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cmd->close_in = 1;
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}
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need_out = !cmd->no_stdout
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&& !cmd->stdout_to_stderr
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&& cmd->out < 0;
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if (need_out) {
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if (pipe(fdout) < 0) {
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if (need_in)
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close_pair(fdin);
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return -ERR_RUN_COMMAND_PIPE;
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}
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cmd->out = fdout[0];
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cmd->close_out = 1;
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}
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cmd->pid = fork();
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if (cmd->pid < 0) {
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if (need_in)
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close_pair(fdin);
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if (need_out)
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close_pair(fdout);
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return -ERR_RUN_COMMAND_FORK;
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}
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if (!cmd->pid) {
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if (cmd->no_stdin)
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dup_devnull(0);
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else if (need_in) {
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dup2(fdin[0], 0);
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close_pair(fdin);
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} else if (cmd->in) {
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dup2(cmd->in, 0);
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close(cmd->in);
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}
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if (cmd->no_stdout)
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dup_devnull(1);
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else if (cmd->stdout_to_stderr)
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dup2(2, 1);
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else if (need_out) {
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dup2(fdout[1], 1);
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close_pair(fdout);
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} else if (cmd->out > 1) {
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dup2(cmd->out, 1);
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close(cmd->out);
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}
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if (cmd->git_cmd) {
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execv_git_cmd(cmd->argv);
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} else {
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execvp(cmd->argv[0], (char *const*) cmd->argv);
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}
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die("exec %s failed.", cmd->argv[0]);
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}
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if (need_in)
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close(fdin[0]);
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else if (cmd->in)
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close(cmd->in);
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if (need_out)
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close(fdout[1]);
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else if (cmd->out > 1)
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close(cmd->out);
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return 0;
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}
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int finish_command(struct child_process *cmd)
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{
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if (cmd->close_in)
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close(cmd->in);
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if (cmd->close_out)
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close(cmd->out);
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for (;;) {
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int status, code;
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pid_t waiting = waitpid(cmd->pid, &status, 0);
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if (waiting < 0) {
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if (errno == EINTR)
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continue;
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error("waitpid failed (%s)", strerror(errno));
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return -ERR_RUN_COMMAND_WAITPID;
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}
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if (waiting != cmd->pid)
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return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
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if (WIFSIGNALED(status))
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return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
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if (!WIFEXITED(status))
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return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
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code = WEXITSTATUS(status);
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if (code)
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return -code;
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return 0;
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}
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}
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int run_command(struct child_process *cmd)
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{
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int code = start_command(cmd);
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if (code)
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return code;
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return finish_command(cmd);
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}
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int run_command_v_opt(const char **argv, int opt)
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{
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struct child_process cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.argv = argv;
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cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
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cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
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cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
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return run_command(&cmd);
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}
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