sysdeps/unix/sysv/linux/rseq-internal.h

   1 /* Restartable Sequences internal API.  Linux implementation.
   2    Copyright (C) 2021-2024 Free Software Foundation, Inc.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef RSEQ_INTERNAL_H
  19 #define RSEQ_INTERNAL_H
  20
  21 #include <sysdep.h>
  22 #include <errno.h>
  23 #include <kernel-features.h>
  24 #include <stdbool.h>
  25 #include <stdio.h>
  26 #include <sys/rseq.h>
  27
  28 #ifdef RSEQ_SIG
  29 static inline bool
  30 rseq_register_current_thread (struct pthread *self, bool do_rseq)
  31 {
  32   if (do_rseq)
  33     {
  34       int ret = INTERNAL_SYSCALL_CALL (rseq, &self->rseq_area,
  35                                        sizeof (self->rseq_area),
  36                                        0, RSEQ_SIG);
  37       if (!INTERNAL_SYSCALL_ERROR_P (ret))
  38         return true;
  39     }
  40   THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
  41   return false;
  42 }
  43 #else /* RSEQ_SIG */
  44 static inline bool
  45 rseq_register_current_thread (struct pthread *self, bool do_rseq)
  46 {
  47   THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
  48   return false;
  49 }
  50 #endif /* RSEQ_SIG */
  51
  52 #endif /* rseq-internal.h */