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ebcb5d16ca
If the calling process wants to send data to stdin of a child process it will need to arrange for a pipe and get the child process running, feed data to it, then wait for the child process to finish. So we split the run function into two halves, allowing callers to first start the child then later finish it. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
72 lines
1.5 KiB
C
72 lines
1.5 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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int start_command(struct child_process *cmd)
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{
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cmd->pid = fork();
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if (cmd->pid < 0)
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return -ERR_RUN_COMMAND_FORK;
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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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}
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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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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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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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