Mac Developer Library Developer


This manual page is part of Xcode Tools version 5.0

To obtain these tools:

If you are running a version of Xcode Tools other than 5.0, view the documentation locally:

  • In Xcode

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.

SIGSETMASK(2)               BSD System Calls Manual              SIGSETMASK(2)

     sigsetmask -- set current signal mask

     Standard C Library (libc, -lc)

     #include <signal.h>

     sigsetmask(int mask);


     This interface is made obsolete by: sigprocmask(2).

     Sigsetmask() sets the current signal mask.  Signals are blocked from delivery if the corresponding bit
     in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum.

     The system quietly disallows SIGKILL or SIGSTOP to be blocked.

     The previous set of masked signals is returned.

     kill(2), sigaction(2), sigblock(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3)

     The sigsetmask() function call appeared in 4.2BSD and has been deprecated.

BSD                              June 2, 1993                              BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.