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/*
* test_mkfds_ppoll.c - call ppoll(2) DIRECTLY
*
* Written by Masatake YAMATO <yamato@redhat.com>
*
* 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.
*
* This program is distributed in the hope that it would 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/* Why this ppoll multiplexer must be defined here?
*
* Glibc defines sigset_t its own way. However, it is not what kernel
* expects.
*
* If an applicaiton uses the glibc's sigset_t via ppoll(2) wrapper,
* there is no problem; the wrapper function may translate the glibc's
* sigset_t to what kernel expects.
*
* Here, we want to ppoll(2) directly. In this case, the glibc's sigset_t
* becomes an issue. To use ppoll(2) directly, we have to include <asm/poll.h>.
* Including both <poll.h> provided by glibc and <asm/poll.h> provided by kernel
* causes "redefined ***" errors.
*
* This file is for defining the poll multiplexer only with <asm/poll.h>.
*
*/
#include "test_mkfds.h"
#include <string.h> /* memset */
#include <err.h> /* err */
#include <errno.h> /* EINTR */
#include <linux/poll.h> /* struct pollfd */
#include <asm/signal.h> /* sigset_t */
extern long syscall(long number, ...);
extern void *calloc(size_t nmemb, size_t size);
extern void free(void *ptr);
#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif
#ifndef XALLOC_EXIT_CODE
# define XALLOC_EXIT_CODE EXIT_FAILURE
#endif
/* Copied from include/xalloc.h */
static void *xcalloc(const size_t nelems, const size_t size)
{
void *ret = calloc(nelems, size);
if (!ret && size && nelems)
err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
return ret;
}
/* sigemptyset may not be defiend and/or declared in asm/signal.h */
static void clear_sigset(sigset_t *sigset)
{
memset(sigset, 0, sizeof(*sigset));
}
#ifdef __NR_ppoll
DEFUN_WAIT_EVENT_POLL(ppoll,
"ppoll",
sigset_t sigset;,
clear_sigset(&sigset);,
syscall(__NR_ppoll, pfds, n, NULL, &sigset, sizeof(sigset)))
#endif
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