sysdeps/unix/sysv/linux/not-cancel.h

   1 /* Uncancelable versions of cancelable interfaces.  Linux/NPTL version.
   2    Copyright (C) 2003-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef NOT_CANCEL_H
  21 # define NOT_CANCEL_H
  22
  23 #include <fcntl.h>
  24 #include <sysdep.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <sys/syscall.h>
  28
  29 /* Non cancellable open syscall.  */
  30 __typeof (open) __open_nocancel;
  31 libc_hidden_proto (__open_nocancel)
  32
  33 /* Non cancellable open syscall (LFS version).  */
  34 __typeof (open64) __open64_nocancel;
  35 libc_hidden_proto (__open64_nocancel)
  36
  37 /* Non cancellable openat syscall.  */
  38 __typeof (openat) __openat_nocancel;
  39 libc_hidden_proto (__openat_nocancel)
  40
  41 /* Non cacellable openat syscall (LFS version).  */
  42 __typeof (openat64) __openat64_nocancel;
  43 libc_hidden_proto (__openat64_nocancel)
  44
  45 /* Non cancellable read syscall.  */
  46 __typeof (__read) __read_nocancel;
  47 libc_hidden_proto (__read_nocancel)
  48
  49 /* Uncancelable write.  */
  50 __typeof (__write) __write_nocancel;
  51 libc_hidden_proto (__write_nocancel)
  52
  53 /* Uncancelable close.  */
  54 __typeof (__close) __close_nocancel;
  55 libc_hidden_proto (__close_nocancel)
  56
  57 /* Non cancellable close syscall that does not also set errno in case of
  58    failure.  */
  59 static inline void
  60 __close_nocancel_nostatus (int fd)
  61 {
  62   __close_nocancel (fd);
  63 }
  64
  65 /* Uncancelable writev.  */
  66 #define writev_not_cancel_no_status(fd, iov, n) \
  67   (void) ({ INTERNAL_SYSCALL_DECL (err);                                      \
  68             INTERNAL_SYSCALL (writev, err, 3, (fd), (iov), (n)); })
  69
  70 /* Uncancelable fcntl.  */
  71 #define fcntl_not_cancel(fd, cmd, val) \
  72   __fcntl_nocancel (fd, cmd, val)
  73
  74 /* Uncancelable waitpid.  */
  75 #define __waitpid_nocancel(pid, stat_loc, options) \
  76   INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL)
  77 #define waitpid_not_cancel(pid, stat_loc, options) \
  78   __waitpid_nocancel(pid, stat_loc, options)
  79
  80 /* Uncancelable pause.  */
  81 #define pause_not_cancel() \
  82   ({ sigset_t set;                                                           \
  83      int __rc = INLINE_SYSCALL (rt_sigprocmask, 4, SIG_BLOCK, NULL, &set,    \
  84                                 _NSIG / 8);                                  \
  85      if (__rc == 0)                                                          \
  86        __rc = INLINE_SYSCALL (rt_sigsuspend, 2, &set, _NSIG / 8);            \
  87      __rc;                                                                   \
  88   })
  89
  90 /* Uncancelable nanosleep.  */
  91 #define nanosleep_not_cancel(requested_time, remaining) \
  92   INLINE_SYSCALL (nanosleep, 2, requested_time, remaining)
  93
  94 /* Uncancelable sigsuspend.  */
  95 #define sigsuspend_not_cancel(set) \
  96   INLINE_SYSCALL (rt_sigsuspend, 2, set, _NSIG / 8)
  97
  98 #endif /* NOT_CANCEL_H  */