8.945 sighold

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/sighold.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: FreeBSD 6.0, OpenBSD 3.8, Minix 3.1.8, mingw, MSVC 9, BeOS.