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/* Test that dprintf returns the expected length.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include <support/check.h>
#include <sys/socket.h>
#include <unistd.h>
static int
do_test (void)
{
/* Use a datagram socket to check that everything arrives in one packet.
The dprintf function should perform a single write call. */
int fds[2];
TEST_VERIFY_EXIT (socketpair (AF_LOCAL, SOCK_DGRAM, 0, fds) == 0);
TEST_COMPARE (dprintf (fds[0], "(%d)%s[%d]", 123, "---", 4567), 14);
char buf[32];
ssize_t ret = read (fds[1], buf, sizeof (buf));
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE_BLOB (buf, ret, "(123)---[4567]", strlen ("(123)---[4567]"));
close (fds[1]);
close (fds[0]);
return 0;
}
#include <support/test-driver.c>
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