glibc/sysdeps/unix/sysv/linux/sys/timerfd.h

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/* Copyright (C) 2008-2018 Free Software Foundation, Inc.
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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
<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_TIMERFD_H
#define _SYS_TIMERFD_H 1
#include <time.h>
Installed-header hygiene (BZ#20366): time.h types. Many headers are expected to expose a subset of the type definitions in time.h. time.h has a whole bunch of messy logic for conditionally defining some its types and structs, but, as best I can tell, this has never worked 100%. In particular, __need_timespec is ineffective if _TIME_H has already been defined, which means that if you compile #include <time.h> #include <sched.h> with e.g. -fsyntax-only -std=c89 -Wall -Wsystem-headers, you will get In file included from test.c:2:0: /usr/include/sched.h:74:57: warning: "struct timespec" declared inside parameter list will not be visible outside of this definition or declaration extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW; ^~~~~~~~ And if you want to _use_ sched_rr_get_interval in a TU compiled that way, you're hosed. This patch replaces all of that with small bits/types/TYPE.h headers as introduced earlier. time.h and bits/time.h are now *much* simpler, and a lot of other headers are slightly simpler. * time/time.h, bits/time.h, sysdeps/unix/sysv/linux/bits/time.h: Remove all logic conditional on __need macros. Move all the conditionally defined types to their own headers... * time/bits/types/clock_t.h: Define clock_t here. * time/bits/types/clockid_t.h: Define clockid_t here. * time/bits/types/struct_itimerspec.h: Define struct itimerspec here. * time/bits/types/struct_timespec.h: Define struct timespec here. * time/bits/types/struct_timeval.h: Define struct timeval here. * time/bits/types/struct_tm.h: Define struct tm here. * time/bits/types/time_t.h: Define time_t here. * time/bits/types/timer_t.h: Define timer_t here. * time/Makefile: Install the new headers. * bits/resource.h, io/fcntl.h, io/sys/poll.h, io/sys/stat.h * io/utime.h, misc/sys/select.h, posix/sched.h, posix/sys/times.h * posix/sys/types.h, resolv/netdb.h, rt/aio.h, rt/mqueue.h * signal/signal.h, pthread/semaphore.h, sysdeps/nptl/pthread.h * sysdeps/unix/sysv/linux/alpha/bits/resource.h * sysdeps/unix/sysv/linux/alpha/sys/acct.h * sysdeps/unix/sysv/linux/bits/resource.h * sysdeps/unix/sysv/linux/bits/timex.h * sysdeps/unix/sysv/linux/mips/bits/resource.h * sysdeps/unix/sysv/linux/net/ppp_defs.h * sysdeps/unix/sysv/linux/sparc/bits/resource.h * sysdeps/unix/sysv/linux/sys/acct.h * sysdeps/unix/sysv/linux/sys/timerfd.h * sysvipc/sys/msg.h, sysvipc/sys/sem.h, sysvipc/sys/shm.h * time/sys/time.h, time/sys/timeb.h Use the new bits/types headers. * include/time.h: Remove __need logic. * include/bits/time.h * include/bits/types/clock_t.h, include/bits/types/clockid_t.h * include/bits/types/time_t.h, include/bits/types/timer_t.h * include/bits/types/struct_itimerspec.h * include/bits/types/struct_timespec.h * include/bits/types/struct_timeval.h * include/bits/types/struct_tm.h: New wrapper headers.
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#include <bits/types/struct_itimerspec.h>
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/* Get the platform-dependent flags. */
#include <bits/timerfd.h>
* Versions.def (glibc): Add GLIBC_2.9. * io/Makefile (routines): Add dup3 and pipe2. * io/Versions [glibc] (GLIBC_2.9): Add dup3 and pipe2. * io/dup3.c: New file. * io/pipe2.c: New file. * posix/unistd.h: Declare dup3 and pipe2. * socket/Makefile (routines): Add paccept. * socket/Versions [glibc] (GLIBC_2.9): Add paccept. * socket/paccept.c: New file. * socket/sys/socket.h: Declare paccept. * sysdeps/unix/syscalls.list: Add entry for dup3. * sysdeps/unix/sysv/linux/Versions [glibc] (GLIBC_2.9): Add epoll_create2 and inotify_init1. * sysdeps/unix/sysv/linux/eventfd.c: Use eventfd1 syscall if possible. * sysdeps/unix/sysv/linux/paccept.c: New file. * sysdeps/unix/sysv/linux/signalfd.c: Use signalfd4 syscall if possible. * sysdeps/unix/sysv/linux/socketcall.h: Add SOCKOP_paccept. * sysdeps/unix/sysv/linux/syscalls.list: Add epoll_create2, inotify_init1, and pipe2 entries. * sysdeps/unix/sysv/linux/alpha/sys/epoll.h: New file. * sysdeps/unix/sysv/linux/alpha/sys/eventfd.h: New file. * sysdeps/unix/sysv/linux/alpha/sys/inotify.h: New file. * sysdeps/unix/sysv/linux/alpha/sys/signalfd.h: New file. * sysdeps/unix/sysv/linux/alpha/sys/timerfd.h: New file. * sysdeps/unix/sysv/linux/bits/socket.h: Define SOCK_CLOEXEC and SOCK_NONBLOCK. * sysdeps/unix/sysv/linux/i386/paccept.S: New file. * sysdeps/unix/sysv/linux/sparc/sys/epoll.h: New file. * sysdeps/unix/sysv/linux/sparc/sys/eventfd.h: New file. * sysdeps/unix/sysv/linux/sparc/sys/inotify.h: New file. * sysdeps/unix/sysv/linux/sparc/sys/signalfd.h: New file. * sysdeps/unix/sysv/linux/sparc/sys/timerfd.h: New file. * sysdeps/unix/sysv/linux/sparc/bits/socket.h: New file. * sysdeps/unix/sysv/linux/sys/epoll.h: Define EPOLL_CLOEXEC and EPOLL_NONBLOCK. Declare epoll_create2. * sysdeps/unix/sysv/linux/sys/eventfd.h: Define EFD_CLOEXEC and EFD_NONBLOCK. * sysdeps/unix/sysv/linux/sys/inotify.h: Define IN_CLOEXEC and IN_NONBLOCK. Declare inotify_init1. * sysdeps/unix/sysv/linux/sys/signalfd.h: Define SFD_CLOEXEC and SFD_NONBLOCK. * sysdeps/unix/sysv/linux/sys/timerfd.h: Define TFD_CLOEXEC and TFD_NONBLOCK.
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/* Bits to be set in the FLAGS parameter of `timerfd_settime'. */
enum
{
TFD_TIMER_ABSTIME = 1 << 0,
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#define TFD_TIMER_ABSTIME TFD_TIMER_ABSTIME
TFD_TIMER_CANCEL_ON_SET = 1 << 1
#define TFD_TIMER_CANCEL_ON_SET TFD_TIMER_CANCEL_ON_SET
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};
__BEGIN_DECLS
/* Return file descriptor for new interval timer source. */
Installed-header hygiene (BZ#20366): Simple self-contained fixes. Some headers did not include all of their prerequisite headers. * rpcsvc/nislib.h: Include rpcsvc/nis.h. * sysdeps/unix/sysv/linux/netrose/rose.h: Include sys/socket.h and netax25/ax25.h. <endian.h> only defines BYTE_ORDER, BIG_ENDIAN, LITTLE_ENDIAN, etc. under __USE_MISC; glibc's headers should use __BYTE_ORDER, __BIG_ENDIAN, __LITTLE_ENDIAN, etc. instead. * inet/netinet/icmp6.h, inet/netinet/ip6.h * resolv/arpa/nameser_compat.h: Use __BYTE_ORDER etc. instead of BYTE_ORDER etc. sys/types.h only conditionally defines caddr_t and clockid_t. * sysdeps/unix/sysv/linux/sys/quota.h: Use __caddr_t instead of caddr_t. * sysdeps/unix/sysv/linux/sys/timerfd.h: Use __clockid_t instead of clockid_t. Remove a #warning that was the sole actual problem with using sys/ipc.h without _GNU_SOURCE/_XOPEN_SOURCE. * sysvipc/sys/ipc.h: Remove unnecessary #warning. _LIBC, __USE_XOPEN2K8, and __STDC_VERSION__ are not always defined. It seems to me that _LIBC should not appear in installed headers, but avoiding that for argp specifically would require more surgery than feels appropriate for this patch set. It's possible that "#ifdef _LIBC" would be sufficient, but I wanted to be conservative. All three versions of bits/socket.h want to know whether __flexarr will produce a real flexible array member -- specifically, one that doesn't alter sizeof(the structure containing it). They were testing for this with a complicated #if condition that did not agree with sys/cdefs.h and that tripped -Wundef warnings under -std=c90. I added a new macro to sys/cdefs.h, __glibc_c99_flexarr_available, which reveals exactly what these headers want to know. I also took the opportunity to flatten the rather messy conditional nest defining __flexarr. * argp/argp.h: Check whether _LIBC is defined before expanding it. * posix/glob.h: Check whether __USE_XOPEN2K8 is defined instead of expanding it. * misc/sys/cdefs.h: Tidy up conditional nest defining __flexarr. Define __glibc_c99_flexarr_available to 1 when the compiler supports C99-compatible flexible array members, 0 otherwise. * sysdeps/unix/sysv/linux/bits/socket.h * sysdeps/mach/hurd/bits/socket.h * bits/socket.h: Use __glibc_c99_flexarr_available in definitions of struct cmsghdr and CMSG_DATA.
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extern int timerfd_create (__clockid_t __clock_id, int __flags) __THROW;
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/* Set next expiration time of interval timer source UFD to UTMR. If
FLAGS has the TFD_TIMER_ABSTIME flag set the timeout value is
absolute. Optionally return the old expiration time in OTMR. */
extern int timerfd_settime (int __ufd, int __flags,
const struct itimerspec *__utmr,
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struct itimerspec *__otmr) __THROW;
/* Return the next expiration time of UFD. */
extern int timerfd_gettime (int __ufd, struct itimerspec *__otmr) __THROW;
__END_DECLS
#endif /* sys/timerfd.h */