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

   1 /* Uncancelable versions of cancelable interfaces.  Linux/NPTL version.
   2    Copyright (C) 2003-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef NOT_CANCEL_H
  20 # define NOT_CANCEL_H
  21
  22 #include <fcntl.h>
  23 #include <sysdep.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <sys/poll.h>
  27 #include <sys/syscall.h>
  28 #include <sys/wait.h>
  29 #include <time.h>
  30
  31 /* Non cancellable open syscall.  */
  32 __typeof (open) __open_nocancel;
  33
  34 /* Non cancellable open syscall (LFS version).  */
  35 __typeof (open64) __open64_nocancel;
  36
  37 /* Non cancellable openat syscall.  */
  38 __typeof (openat) __openat_nocancel;
  39
  40 /* Non cacellable openat syscall (LFS version).  */
  41 __typeof (openat64) __openat64_nocancel;
  42
  43 /* Non cancellable read syscall.  */
  44 __typeof (__read) __read_nocancel;
  45
  46 /* Non cancellable pread syscall (LFS version).  */
  47 __typeof (__pread64) __pread64_nocancel;
  48
  49 /* Uncancelable write.  */
  50 __typeof (__write) __write_nocancel;
  51
  52 /* Uncancelable close.  */
  53 __typeof (__close) __close_nocancel;
  54
  55 /* Uncancelable fcntl.  */
  56 __typeof (__fcntl) __fcntl64_nocancel;
  57
  58 #if IS_IN (libc) || IS_IN (rtld)
  59 hidden_proto (__open_nocancel)
  60 hidden_proto (__open64_nocancel)
  61 hidden_proto (__openat_nocancel)
  62 hidden_proto (__openat64_nocancel)
  63 hidden_proto (__read_nocancel)
  64 hidden_proto (__pread64_nocancel)
  65 hidden_proto (__write_nocancel)
  66 hidden_proto (__close_nocancel)
  67 hidden_proto (__fcntl64_nocancel)
  68 #endif
  69
  70 /* Non cancellable close syscall that does not also set errno in case of
  71    failure.  */
  72 static inline void
  73 __close_nocancel_nostatus (int fd)
  74 {
  75   __close_nocancel (fd);
  76 }
  77
  78 /* Non cancellable writev syscall that does not also set errno in case of
  79    failure.  */
  80 static inline void
  81 __writev_nocancel_nostatus (int fd, const struct iovec *iov, int iovcnt)
  82 {
  83   INTERNAL_SYSCALL_CALL (writev, fd, iov, iovcnt);
  84 }
  85
  86 static inline ssize_t
  87 __getrandom_nocancel (void *buf, size_t buflen, unsigned int flags)
  88 {
  89   return INLINE_SYSCALL_CALL (getrandom, buf, buflen, flags);
  90 }
  91
  92 /* Non cancellable getrandom syscall that does not also set errno in case of
  93    failure.  */
  94 static inline ssize_t
  95 __getrandom_nocancel_nostatus (void *buf, size_t buflen, unsigned int flags)
  96 {
  97   return INTERNAL_SYSCALL_CALL (getrandom, buf, buflen, flags);
  98 }
  99
 100 static inline int
 101 __poll_infinity_nocancel (struct pollfd *fds, nfds_t nfds)
 102 {
 103   return INLINE_SYSCALL_CALL (ppoll, fds, nfds, NULL, NULL, 0);
 104 }
 105
 106 #endif /* NOT_CANCEL_H  */