osf1 man page for pthread_sigmask

pthread_sigmask(3)					     Library Functions Manual						pthread_sigmask(3)

NAME
       pthread_sigmask - Examine or change the current thread's signal mask.

LIBRARY
       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS
       #include <pthread.h> #include <signal.h>

       int   pthread_sigmask(
			     int	     how,
			     const sigset_t  *set,
			     sigset_t	     *oset);

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS
       Indicates  the manner in which the set of masked signals is changed.  The optional values are as follows: The resulting set is the union of
       the current set and the signal set pointed to by the set argument.)  The resulting set is the intersection of the current set and the  com-
       plement	of  the signal set pointed to by the set argument.  The resulting set is the signal set pointed to by the set argument.  Specifies
       the signal set by pointing to a set of signals used to change the blocked set.  If this set value is NULL, the how argument is ignored  and
       the process signal mask is unchanged.  Receives the value of the current signal mask (unless this value is NULL).

DESCRIPTION
       This routine is for UNIX systems only.

       This routine examines or changes the calling thread's signal mask.  Typically, you use the SIG_BLOCK option for the how value to block sig-
       nals during a critical section of code, and then use this routine's SIG_SETMASK option to restore the mask to the previous  value  returned
       by the previous call to the pthread_sigmask(3) routine.

       If  there  are  any  unblocked signals pending after a call to this routine, at least one of those signals is delivered before this routine
       returns.

       This routine does not allow the SIGKILL or SIGSTOP signals to  be  blocked.   If  a  program  attempts  to  block  one  of  these  signals,
       pthread_sigmask(3) gives no indication of the error.

RETURN VALUES
       If  an  error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are as follows:
       Successful completion.  The value specified for how is invalid.

ERRORS
       None

RELATED INFORMATION
       Manuals: Guide to DECthreads and Programmer's Guide

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																pthread_sigmask(3)