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

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• Hash : a3f953e8
  Author :
  Date : 2008-08-16T13:47:58
  

  c-stack: fix regression on Irix 5.3 from 2008-06-21
  
  * m4/c-stack.m4 (gl_PREREQ_C_STACK): Move check for
  sa_sigaction...
  * m4/sigaction.m4 (gl_PREREQ_SIG_HANDLER_H): ...here.
  (gl_PREREQ_SIGACTION): Depend on sig-handler.h prereq's.
  * m4/signal_h.m4 (gl_SIGNAL_H_DEFAULTS): Set the default.
  * modules/signal (Makefile.am): Use the value.
  * lib/signal.in.h (sa_sigaction) [HAVE_SIGACTION
  && !HAVE_STRUCT_SIGACTION_SA_SIGACTION]: Define.
  * doc/posix-headers/signal.texi (signal.h): Document this
  portability issue.
  * doc/posix-functions/sigaction.texi (sigaction): Likewise.
  Reported by Tom G. Christensen.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• doc/posix-functions/sigaction.texi

• @node sigaction
  @section @code{sigaction}
  @findex sigaction
  
  POSIX specification: @url{http://www.opengroup.org/susv3xsh/sigaction.html}
  
  Gnulib module: sigaction
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function is missing on some platforms:
  mingw.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  POSIX recommends that when specifying SA_RESETHAND, SA_NODEFER must
  also be specified.
  
  @item
  Support for SA_ONSTACK is missing on some platforms:
  mingw, cygwin.
  
  @item
  Support for SA_SIGINFO is missing on some platforms:
  mingw, Interix 3.5.
  
  @item
  Support for SIGCHLD, and thus for SA_NOCLDSTOP and SA_NOCLDWAIT, is
  missing on some platforms:
  mingw.
  
  @item
  Support for SA_RESTART is missing on some platforms:
  mingw.
  
  @item
  In spite of having SA_SIGACTION, struct sigaction lacks the
  sa_sigaction member on some platforms:
  Irix 5.3.
  
  @item
  The symbolic value @code{SIG_IGN} for the @code{SIGCHLD} signal is equivalent
  to a signal handler
  @smallexample
  void handle_child (int sigchld)
  @{
    while (waitpid (-1, NULL, WNOHANG) > 0)
      ;
  @}
  @end smallexample
  except that @code{SIG_IGN} for @code{SIGCHLD} has the effect that the children
  execution times are not accounted in the @code{times} function.
  On some platforms (BSD? SystemV? Linux?), you need to use the @code{sigaction}
  flag @code{SA_NOCLDWAIT} in order to obtain this behavior.
  @end itemize
  

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