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SIGPROCMASK(2)			    Linux Programmer's Manual			   SIGPROCMASK(2)

       sigprocmask - examine and change blocked signals

       #include <signal.h>

       int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigprocmask(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

       sigprocmask()  is  used to fetch and/or change the signal mask of the calling thread.  The
       signal mask is the set of signals whose delivery is currently blocked for the caller  (see
       also signal(7) for more details).

       The behavior of the call is dependent on the value of how, as follows.

	      The set of blocked signals is the union of the current set and the set argument.

	      The signals in set are removed from the current set of blocked signals.  It is per-
	      missible to attempt to unblock a signal which is not blocked.

	      The set of blocked signals is set to the argument set.

       If oldset is non-NULL, the previous value of the signal mask is stored in oldset.

       If set is NULL, then the signal mask is unchanged (i.e., how is ignored), but the  current
       value of the signal mask is nevertheless returned in oldset (if it is not NULL).

       The  use  of  sigprocmask()  is	unspecified  in a multithreaded process; see pthread_sig-

       sigprocmask() returns 0 on success and -1 on error.  In the event of an	error,	errno  is
       set to indicate the cause.

       EFAULT the set or oldset argument points outside the process's allocated address space.

       EINVAL The value specified in how was invalid.


       It is not possible to block SIGKILL or SIGSTOP.	Attempts to do so are silently ignored.

       Each of the threads in a process has its own signal mask.

       A  child  created via fork(2) inherits a copy of its parent's signal mask; the signal mask
       is preserved across execve(2).

       If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while they are blocked, the result  is
       undefined, unless the signal was generated by kill(2), sigqueue(3), or raise(3).

       See sigsetops(3) for details on manipulating signal sets.

       kill(2),  pause(2),  sigaction(2),  signal(2),  sigpending(2), sigsuspend(2), pthread_sig-
       mask(3), sigqueue(3), sigsetops(3), signal(7)

       This page is part of release 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at

Linux					    2013-04-19				   SIGPROCMASK(2)
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