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 <setjmp.h>
      20  #include <signal.h>
      21  #include <pthreadP.h>
      22  #include <jmpbuf-unwind.h>
      23  
      24  extern void __sigstack_longjmp (__jmp_buf, int)
      25       __attribute__ ((noreturn));
      26  
      27  /* Like __libc_siglongjmp(), but safe for crossing from alternate
      28     signal stack to normal stack.  Needed by NPTL.  */
      29  void
      30  __libc_unwind_longjmp (sigjmp_buf env, int val)
      31  {
      32    /* Perform any cleanups needed by the frames being unwound.  */
      33    __pthread_cleanup_upto (env->__jmpbuf, CURRENT_STACK_FRAME);
      34  
      35    if (env[0].__mask_was_saved)
      36      /* Restore the saved signal mask.  */
      37      __sigprocmask (SIG_SETMASK, &env[0].__saved_mask, NULL);
      38  
      39    /* Call the machine-dependent function to restore machine state.  */
      40    __sigstack_longjmp (env[0].__jmpbuf, val ?: 1);
      41  }
      42  hidden_def (__libc_unwind_longjmp)