pthread_sigmask(3)pthread_sigmask(3)NAMEpthread_sigmask - Examine or change the current thread's signal mask
SYNOPSIS
#include <pthread.h> #include <signal.h>
int pthread_sigmask(
int how,
const sigset_t *set,
sigset_t *oset );
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards 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 complement
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 rou‐
tine, 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
SEE ALSO
Manuals: Guide to DECthreads and Programmer's Guide
pthread_sigmask(3)