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@node sigaction
@section @code{sigaction}
@findex sigaction
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.html}
Gnulib module: sigaction
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw, MSVC 14.
@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, MSVC 14, cygwin.
@item
Support for SA_SIGINFO is missing on some platforms:
mingw, MSVC 14.
@item
Support for SIGCHLD, and thus for SA_NOCLDSTOP and SA_NOCLDWAIT, is
missing on some platforms:
mingw, MSVC 14.
@item
Support for SA_RESETHAND is missing on some platforms:
NonStop.
@item
Support for SA_RESTART is missing on some platforms:
mingw, MSVC 14, NonStop.
@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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