kc3-lang/gnulib/doc/posix-functions/longjmp.texi

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• Hash : 4b3bf87e
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  Date : 2025-01-06T01:16:11
  

  sigsegv tests: Work around a longjmp bug on GNU/Hurd.
  
  * tests/test-sigsegv-catch-stackoverflow1.c (_FORTIFY_SOURCE,
  __USE_FORTIFY_LEVEL): Undefine, as a workaround to the Hurd longjmp bug.
  * tests/test-sigsegv-catch-stackoverflow2.c (_FORTIFY_SOURCE,
  __USE_FORTIFY_LEVEL): Likewise.
  * doc/posix-functions/longjmp.texi: Document the Hurd bug.
  

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• doc/posix-functions/longjmp.texi

• @node longjmp
  @subsection @code{longjmp}
  @findex longjmp
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/longjmp.html}
  
  Gnulib module: ---
  
  Portability problems fixed by Gnulib:
  @itemize
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  The effects of this call are system and compiler optimization dependent,
  since it restores the contents of register-allocated variables but not
  the contents of stack-allocated variables.
  @item
  When longjumping out of a signal handler that was being executed on an
  alternate stack (installed through @code{sigaltstack}),
  on Hurd, FreeBSD, NetBSD, OpenBSD,
  you need to clear the @code{SS_ONSTACK} flag in the @code{stack_t}
  structure managed by the kernel.
  @item
  This function may crash when the invoker code was compiled with option
  @code{-D_FORTIFY_SOURCE=2},
  @c https://sourceware.org/bugzilla/show_bug.cgi?id=32522
  on Hurd.
  @end itemize
  

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