setjmp/longjmp.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   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 #include <stddef.h>
  19 #include <setjmpP.h>
  20 #include <signal.h>
  21
  22 #undef longjmp
  23 #undef siglongjmp
  24
  25 /* Set the signal mask to the one specified in ENV, and jump
  26    to the position specified in ENV, causing the setjmp
  27    call there to return VAL, or 1 if VAL is 0.  */
  28 void
  29 __libc_siglongjmp (sigjmp_buf env, int val)
  30 {
  31   /* Perform any cleanups needed by the frames being unwound.  */
  32   _longjmp_unwind (env, val);
  33
  34   if (env[0].__mask_was_saved)
  35     /* Restore the saved signal mask.  */
  36     (void) __sigprocmask (SIG_SETMASK,
  37                           (sigset_t *) &env[0].__saved_mask,
  38                           (sigset_t *) NULL);
  39
  40   /* Call the machine-dependent function to restore machine state.  */
  41   __longjmp (env[0].__jmpbuf, val ?: 1);
  42 }
  43
  44 #ifndef __libc_siglongjmp
  45 # ifndef __libc_longjmp
  46 /* __libc_longjmp is a private interface for cancellation implementation
  47    in libpthread.  */
  48 strong_alias (__libc_siglongjmp, __libc_longjmp)
  49 # endif
  50 weak_alias (__libc_siglongjmp, _longjmp)
  51 weak_alias (__libc_siglongjmp, longjmp)
  52 weak_alias (__libc_siglongjmp, siglongjmp)
  53 #endif