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A new build flag, _TIME_BITS, enables the usage of the newer 64-bit
time symbols for legacy ABI (where 32-bit time_t is default). The 64
bit time support is only enabled if LFS (_FILE_OFFSET_BITS=64) is
also used.
Different than LFS support, the y2038 symbols are added only for the
required ABIs (armhf, csky, hppa, i386, m68k, microblaze, mips32,
mips64-n32, nios2, powerpc32, sparc32, s390-32, and sh). The ABIs with
64-bit time support are unchanged, both for symbol and types
redirection.
On Linux the full 64-bit time support requires a minimum of kernel
version v5.1. Otherwise, the 32-bit fallbacks are used and might
results in error with overflow return code (EOVERFLOW).
The i686-gnu does not yet support 64-bit time.
This patch exports following rediretions to support 64-bit time:
* libc:
adjtime
adjtimex
clock_adjtime
clock_getres
clock_gettime
clock_nanosleep
clock_settime
cnd_timedwait
ctime
ctime_r
difftime
fstat
fstatat
futimens
futimes
futimesat
getitimer
getrusage
gettimeofday
gmtime
gmtime_r
localtime
localtime_r
lstat_time
lutimes
mktime
msgctl
mtx_timedlock
nanosleep
nanosleep
ntp_gettime
ntp_gettimex
ppoll
pselec
pselect
pthread_clockjoin_np
pthread_cond_clockwait
pthread_cond_timedwait
pthread_mutex_clocklock
pthread_mutex_timedlock
pthread_rwlock_clockrdlock
pthread_rwlock_clockwrlock
pthread_rwlock_timedrdlock
pthread_rwlock_timedwrlock
pthread_timedjoin_np
recvmmsg
sched_rr_get_interval
select
sem_clockwait
semctl
semtimedop
sem_timedwait
setitimer
settimeofday
shmctl
sigtimedwait
stat
thrd_sleep
time
timegm
timerfd_gettime
timerfd_settime
timespec_get
utime
utimensat
utimes
utimes
wait3
wait4
* librt:
aio_suspend
mq_timedreceive
mq_timedsend
timer_gettime
timer_settime
* libanl:
gai_suspend
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
156 lines
4.9 KiB
C
156 lines
4.9 KiB
C
/* `fd_set' type and related macros, and `select'/`pselect' declarations.
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Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h> */
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#ifndef _SYS_SELECT_H
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#define _SYS_SELECT_H 1
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#include <features.h>
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/* Get definition of needed basic types. */
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#include <bits/types.h>
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/* Get __FD_* definitions. */
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#include <bits/select.h>
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/* Get sigset_t. */
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#include <bits/types/sigset_t.h>
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/* Get definition of timer specification structures. */
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#include <bits/types/time_t.h>
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#include <bits/types/struct_timeval.h>
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#ifdef __USE_XOPEN2K
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# include <bits/types/struct_timespec.h>
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#endif
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#ifndef __suseconds_t_defined
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typedef __suseconds_t suseconds_t;
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# define __suseconds_t_defined
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#endif
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/* The fd_set member is required to be an array of longs. */
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typedef long int __fd_mask;
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/* Some versions of <linux/posix_types.h> define this macros. */
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#undef __NFDBITS
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/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */
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#define __NFDBITS (8 * (int) sizeof (__fd_mask))
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#define __FD_ELT(d) ((d) / __NFDBITS)
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#define __FD_MASK(d) ((__fd_mask) (1UL << ((d) % __NFDBITS)))
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/* fd_set for select and pselect. */
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typedef struct
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{
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/* XPG4.2 requires this member name. Otherwise avoid the name
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from the global namespace. */
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#ifdef __USE_XOPEN
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__fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
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# define __FDS_BITS(set) ((set)->fds_bits)
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#else
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__fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];
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# define __FDS_BITS(set) ((set)->__fds_bits)
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#endif
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} fd_set;
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/* Maximum number of file descriptors in `fd_set'. */
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#define FD_SETSIZE __FD_SETSIZE
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#ifdef __USE_MISC
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/* Sometimes the fd_set member is assumed to have this type. */
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typedef __fd_mask fd_mask;
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/* Number of bits per word of `fd_set' (some code assumes this is 32). */
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# define NFDBITS __NFDBITS
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#endif
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/* Access macros for `fd_set'. */
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#define FD_SET(fd, fdsetp) __FD_SET (fd, fdsetp)
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#define FD_CLR(fd, fdsetp) __FD_CLR (fd, fdsetp)
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#define FD_ISSET(fd, fdsetp) __FD_ISSET (fd, fdsetp)
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#define FD_ZERO(fdsetp) __FD_ZERO (fdsetp)
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__BEGIN_DECLS
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/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
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readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
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(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
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after waiting the interval specified therein. Returns the number of ready
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descriptors, or -1 for errors.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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#ifndef __USE_TIME_BITS64
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extern int select (int __nfds, fd_set *__restrict __readfds,
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fd_set *__restrict __writefds,
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fd_set *__restrict __exceptfds,
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struct timeval *__restrict __timeout);
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#else
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# ifdef __REDIRECT
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extern int __REDIRECT (select,
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(int __nfds, fd_set *__restrict __readfds,
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fd_set *__restrict __writefds,
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fd_set *__restrict __exceptfds,
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struct timeval *__restrict __timeout),
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__select64);
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# else
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# define select __select64
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# endif
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#endif
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#ifdef __USE_XOPEN2K
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/* Same as above only that the TIMEOUT value is given with higher
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resolution and a sigmask which is been set temporarily. This version
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should be used.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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# ifndef __USE_TIME_BITS64
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extern int pselect (int __nfds, fd_set *__restrict __readfds,
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fd_set *__restrict __writefds,
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fd_set *__restrict __exceptfds,
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const struct timespec *__restrict __timeout,
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const __sigset_t *__restrict __sigmask);
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (pselect,
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(int __nfds, fd_set *__restrict __readfds,
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fd_set *__restrict __writefds,
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fd_set *__restrict __exceptfds,
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const struct timespec *__restrict __timeout,
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const __sigset_t *__restrict __sigmask),
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__pselect64);
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# else
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# define pselect __pselect64
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# endif
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# endif
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#endif
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/* Define some inlines helping to catch common problems. */
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#if __USE_FORTIFY_LEVEL > 0 && defined __GNUC__
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# include <bits/select2.h>
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#endif
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__END_DECLS
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#endif /* sys/select.h */
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