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

   1 /* Uncancelable versions of cancelable interfaces.  Linux/NPTL version.
   2    Copyright (C) 2003-2016 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 <sysdep.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <sys/syscall.h>
  27
  28 /* Uncancelable open.  */
  29 #ifdef __NR_open
  30 # define open_not_cancel(name, flags, mode) \
  31    INLINE_SYSCALL (open, 3, name, flags, mode)
  32 # define open_not_cancel_2(name, flags) \
  33    INLINE_SYSCALL (open, 2, name, flags)
  34 #else
  35 # define open_not_cancel(name, flags, mode) \
  36    INLINE_SYSCALL (openat, 4, AT_FDCWD, name, flags, mode)
  37 # define open_not_cancel_2(name, flags) \
  38    INLINE_SYSCALL (openat, 3, AT_FDCWD, name, flags)
  39 #endif
  40
  41 /* Uncancelable read.  */
  42 #define __read_nocancel(fd, buf, len) \
  43   INLINE_SYSCALL (read, 3, fd, buf, len)
  44
  45 /* Uncancelable write.  */
  46 #define __write_nocancel(fd, buf, len) \
  47   INLINE_SYSCALL (write, 3, fd, buf, len)
  48
  49 /* Uncancelable openat.  */
  50 #define openat_not_cancel(fd, fname, oflag, mode) \
  51   INLINE_SYSCALL (openat, 4, fd, fname, oflag, mode)
  52 #define openat_not_cancel_3(fd, fname, oflag) \
  53   INLINE_SYSCALL (openat, 3, fd, fname, oflag)
  54 #define openat64_not_cancel(fd, fname, oflag, mode) \
  55   INLINE_SYSCALL (openat, 4, fd, fname, oflag | O_LARGEFILE, mode)
  56 #define openat64_not_cancel_3(fd, fname, oflag) \
  57   INLINE_SYSCALL (openat, 3, fd, fname, oflag | O_LARGEFILE)
  58
  59 /* Uncancelable close.  */
  60 #define __close_nocancel(fd) \
  61   INLINE_SYSCALL (close, 1, fd)
  62 #define close_not_cancel(fd) \
  63   __close_nocancel (fd)
  64 #define close_not_cancel_no_status(fd) \
  65   (void) ({ INTERNAL_SYSCALL_DECL (err);                                      \
  66             INTERNAL_SYSCALL (close, err, 1, (fd)); })
  67
  68 /* Uncancelable read.  */
  69 #define read_not_cancel(fd, buf, n) \
  70   __read_nocancel (fd, buf, n)
  71
  72 /* Uncancelable write.  */
  73 #define write_not_cancel(fd, buf, n) \
  74   __write_nocancel (fd, buf, n)
  75
  76 /* Uncancelable writev.  */
  77 #define writev_not_cancel_no_status(fd, iov, n) \
  78   (void) ({ INTERNAL_SYSCALL_DECL (err);                                      \
  79             INTERNAL_SYSCALL (writev, err, 3, (fd), (iov), (n)); })
  80
  81 /* Uncancelable fcntl.  */
  82 #define fcntl_not_cancel(fd, cmd, val) \
  83   __fcntl_nocancel (fd, cmd, val)
  84
  85 /* Uncancelable waitpid.  */
  86 #define __waitpid_nocancel(pid, stat_loc, options) \
  87   INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL)
  88 #define waitpid_not_cancel(pid, stat_loc, options) \
  89   __waitpid_nocancel(pid, stat_loc, options)
  90
  91 /* Uncancelable pause.  */
  92 #define pause_not_cancel() \
  93   ({ sigset_t set;                                                           \
  94      int __rc = INLINE_SYSCALL (rt_sigprocmask, 4, SIG_BLOCK, NULL, &set,    \
  95                                 _NSIG / 8);                                  \
  96      if (__rc == 0)                                                          \
  97        __rc = INLINE_SYSCALL (rt_sigsuspend, 2, &set, _NSIG / 8);            \
  98      __rc;                                                                   \
  99   })
 100
 101 /* Uncancelable nanosleep.  */
 102 #define nanosleep_not_cancel(requested_time, remaining) \
 103   INLINE_SYSCALL (nanosleep, 2, requested_time, remaining)
 104
 105 /* Uncancelable sigsuspend.  */
 106 #define sigsuspend_not_cancel(set) \
 107   INLINE_SYSCALL (rt_sigsuspend, 2, set, _NSIG / 8)
 108
 109 #endif /* NOT_CANCEL_H  */