83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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* test_mkfds_ppoll.c - call ppoll(2) DIRECTLY
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*
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* Written by Masatake YAMATO <yamato@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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/* Why this ppoll multiplexer must be defined here?
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*
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* Glibc defines sigset_t its own way. However, it is not what kernel
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* expects.
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*
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* If an application uses the glibc's sigset_t via ppoll(2) wrapper,
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* there is no problem; the wrapper function may translate the glibc's
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* sigset_t to what kernel expects.
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*
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* Here, we want to use ppoll(2) directly. In this case, the glibc's sigset_t
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* becomes an issue. To use ppoll(2) directly, we have to include <asm/poll.h>.
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* Including both <poll.h> provided by glibc and <asm/poll.h> provided by kernel
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* causes "redefined ***" errors.
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*
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* This file is for defining the poll multiplexer only with <asm/poll.h>.
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*
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*/
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#ifdef HAVE_SIGSET_T /* defined in config.h */
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#include "test_mkfds.h"
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#include <string.h> /* memset */
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#include <err.h> /* err */
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#include <errno.h> /* EINTR */
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#include <linux/poll.h> /* struct pollfd */
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#include <asm/signal.h> /* sigset_t */
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extern long syscall(long number, ...);
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extern void *calloc(size_t nmemb, size_t size);
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extern void free(void *ptr);
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#ifndef EXIT_FAILURE
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# define EXIT_FAILURE 1
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#endif
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#ifndef XALLOC_EXIT_CODE
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# define XALLOC_EXIT_CODE EXIT_FAILURE
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#endif
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/* Copied from include/xalloc.h */
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static void *xcalloc(const size_t nelems, const size_t size)
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{
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void *ret = calloc(nelems, size);
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if (!ret && size && nelems)
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err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
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return ret;
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}
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/* sigemptyset may not be defiend and/or declared in asm/signal.h */
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static void clear_sigset(sigset_t *sigset)
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{
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memset(sigset, 0, sizeof(*sigset));
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}
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#ifdef __NR_ppoll
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DEFUN_WAIT_EVENT_POLL(ppoll,
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"ppoll",
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sigset_t sigset;,
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clear_sigset(&sigset);,
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syscall(__NR_ppoll, pfds, n, NULL, &sigset, sizeof(sigset)))
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#endif
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#endif /* HAVE_SIGSET_T */
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