ctdb-common: Add line based I/O

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13520

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
(cherry picked from commit c7041b0faf490661818244dd032ad413ce906e5c)

1 files changed, 102 insertions, 0 deletions

diff --git a/ctdb/tests/src/line_test.c b/ctdb/tests/src/line_test.c
new file mode 100644
index 00000000000..0c5a8211392
--- /dev/null
+++ b/ctdb/tests/src/line_test.c
@@ -0,0 +1,102 @@
+/*
+   Test code for line based I/O over fds
+
+   Copyright (C) Amitay Isaacs  2018
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+
+#include <talloc.h>
+#include <assert.h>
+
+#include "common/line.c"
+
+static int line_print(char *line, void *private_data)
+{
+	printf("%s\n", line);
+	fflush(stdout);
+
+	return 0;
+}
+
+int main(int argc, const char **argv)
+{
+	TALLOC_CTX *mem_ctx;
+	size_t hint = 32;
+	pid_t pid;
+	int ret, lines = 0;
+	int pipefd[2];
+
+	if (argc < 2 || argc > 3) {
+		fprintf(stderr, "Usage: %s <filename> [<hint>]\n", argv[0]);
+		exit(1);
+	}
+
+	if (argc == 3) {
+		long value;
+
+		value = atol(argv[2]);
+		assert(value > 0);
+		hint = value;
+	}
+
+	ret = pipe(pipefd);
+	assert(ret == 0);
+
+	pid = fork();
+	assert(pid != -1);
+
+	if (pid == 0) {
+		char buffer[16];
+		ssize_t n, n2;
+		int fd;
+
+		close(pipefd[0]);
+
+		fd = open(argv[1], O_RDONLY);
+		assert(fd != -1);
+
+		while (1) {
+			n = read(fd, buffer, sizeof(buffer));
+			assert(n >= 0 && n <= sizeof(buffer));
+
+			if (n == 0) {
+				break;
+			}
+
+			n2 = write(pipefd[1], buffer, n);
+			assert(n2 == n);
+		}
+
+		close(pipefd[1]);
+		close(fd);
+
+		exit(0);
+	}
+
+	close(pipefd[1]);
+
+	mem_ctx = talloc_new(NULL);
+	assert(mem_ctx != NULL);
+
+	ret = line_read(pipefd[0], hint, NULL, line_print, NULL, &lines);
+	assert(ret == 0);
+
+	talloc_free(mem_ctx);
+
+	return lines;
+}