@node sigaction
@section @code{sigaction}
@findex sigaction

POSIX specification: @url{http://www.opengroup.org/susv3xsh/sigaction.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw.
@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