contrib/chg/procutil.c

30691:7adb60660496

/* This implementation is based on hgext/pager.py (post 369741ef7253)
 * Return 0 if pager is not started, or pid of the pager */
static pid_t setuppager(const char *pagercmd)
{
	if (!pagercmd)
		return 0;

	int pipefds[2];
	if (pipe(pipefds) < 0)

		if (isatty(fileno(stderr))) {
			if (dup2(pipefds[1], fileno(stderr)) < 0)
				goto error;
		}
		close(pipefds[1]);
		return pid;
	} else {
		dup2(pipefds[0], fileno(stdin));
		close(pipefds[0]);
		close(pipefds[1]);

	close(pipefds[1]);
	abortmsgerrno("failed to prepare pager");
	return 0;
}

static void waitpager(pid_t pid)
{
	/* close output streams to notify the pager its input ends */
	fclose(stdout);
	fclose(stderr);
	while (1) {
		pid_t ret = waitpid(pid, NULL, 0);
		if (ret == -1 && errno == EINTR)
			continue;
		break;
	}
}

30692:23ddd43ba866

/* This implementation is based on hgext/pager.py (post 369741ef7253)
 * Return 0 if pager is not started, or pid of the pager */
static pid_t setuppager(const char *pagercmd)
{
	assert(pagerpid == 0);
	if (!pagercmd)
		return 0;

	int pipefds[2];
	if (pipe(pipefds) < 0)

		if (isatty(fileno(stderr))) {
			if (dup2(pipefds[1], fileno(stderr)) < 0)
				goto error;
		}
		close(pipefds[1]);
		pagerpid = pid;
		return pid;
	} else {
		dup2(pipefds[0], fileno(stdin));
		close(pipefds[0]);
		close(pipefds[1]);

	close(pipefds[1]);
	abortmsgerrno("failed to prepare pager");
	return 0;
}

static void waitpager(void)
{
	if (pagerpid == 0)
		return;

	/* close output streams to notify the pager its input ends */
	fclose(stdout);
	fclose(stderr);
	while (1) {
		pid_t ret = waitpid(pagerpid, NULL, 0);
		if (ret == -1 && errno == EINTR)
			continue;
		break;
	}
}