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9dc09c7664
I started hacking on a change to add stdout redirection support to the run_command family, but found I was using a lot of close calls on two pipes in an array (such as for pipe). So I'm doing a tiny bit of refactoring first to make the next set of changes clearer. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
108 lines
2.0 KiB
C
108 lines
2.0 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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int start_command(struct child_process *cmd)
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{
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int need_in = !cmd->no_stdin && cmd->in < 0;
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int fdin[2];
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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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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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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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int fd = open("/dev/null", O_RDWR);
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dup2(fd, 0);
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close(fd);
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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->stdout_to_stderr)
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dup2(2, 1);
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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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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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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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