Function prepare_child_fds

app/master/daemon/master/master_spawn.cpp:105–166

static ACL_VSTRING *env_gen = 0;

static void prepare_child_fds(ACL_MASTER_SERV *serv)
{
	const char *myname = "prepare_child_fds";
	int n;

	/* MASTER_FLOW_READ_STREAM has been inited in master_vars.c */
	if (acl_var_master_flow_pipe[0] <= ACL_MASTER_FLOW_READ) {
		acl_msg_fatal("%s: flow pipe read descriptor <= %d",
			myname, ACL_MASTER_FLOW_READ);
	}

	if (dup2(acl_var_master_flow_pipe[0], ACL_MASTER_FLOW_READ) < 0) {
		acl_msg_fatal("%s: dup2: %s", myname, strerror(errno));
	}

	if (close(acl_var_master_flow_pipe[0]) < 0) {
		acl_msg_fatal("close %d: %s",
			acl_var_master_flow_pipe[0], strerror(errno));
	}

	/* MASTER_FLOW_WRITE_STREAM has been inited in master_vars.c */
	if (acl_var_master_flow_pipe[1] <= ACL_MASTER_FLOW_WRITE) {
		acl_msg_fatal("%s: flow pipe read descriptor <= %d",
			myname, ACL_MASTER_FLOW_WRITE);
	}
	if (dup2(acl_var_master_flow_pipe[1], ACL_MASTER_FLOW_WRITE) < 0) {
		acl_msg_fatal("%s: dup2: %s", myname, strerror(errno));
	}
	if (close(acl_var_master_flow_pipe[1]) < 0) {
		acl_msg_fatal("close %d: %s",
			acl_var_master_flow_pipe[1], strerror(errno));
	}

	/* Status channel */
	acl_vstream_close(serv->status_reader);

	/* MASTER_STAT_STREAM has been inited in master_vars.c*/
	if (serv->status_fd[1] <= ACL_MASTER_STATUS_FD) {
		acl_msg_fatal("%s: status file descriptor collision", myname);
	}
	if (dup2(serv->status_fd[1], ACL_MASTER_STATUS_FD) < 0) {
		acl_msg_fatal("%s: dup2 status_fd: %s", myname, strerror(errno));
	}

	close(serv->status_fd[1]);

	for (n = 0; n < serv->listen_fd_count; n++) {
		if (serv->listen_fds[n] <= ACL_MASTER_LISTEN_FD + n) {
			acl_msg_fatal("%s: listen fd collision", myname);
		}
		if (dup2(serv->listen_fds[n], ACL_MASTER_LISTEN_FD + n) < 0) {
			acl_msg_fatal("%s: dup2 listen_fd %d: %s",
				myname, serv->listen_fds[n], strerror(errno));
		}
		acl_msg_info("%s: dup listen fd from %d to %d in %s mode",
			myname, serv->listen_fds[n], ACL_MASTER_LISTEN_FD + n,
			acl_is_blocking(ACL_MASTER_LISTEN_FD + n) == 1 ?
				"non-blocking" : "blocking");