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pthread_sigmask(2) [osx man page]

PTHREAD_SIGMASK(2)					      BSD System Calls Manual						PTHREAD_SIGMASK(2)

NAME
pthread_sigmask -- examine and/or change a thread's signal mask SYNOPSIS
#include <signal.h> int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict oset); DESCRIPTION
The pthread_sigmask() function examines and/or changes the calling thread's signal mask. If set is not NULL, it specifies a set of signals to be modified, and how specifies what to set the signal mask to: SIG_BLOCK Union of the current mask and set. SIG_UNBLOCK Intersection of the current mask and the complement of set. SIG_SETMASK set. If oset is not NULL, the previous signal mask is stored in the location pointed to by oset. SIGKILL and SIGSTOP cannot be blocked, and will be silently ignored if included in the signal mask. RETURN VALUES
If successful, pthread_sigmask() returns 0. Otherwise, an error is returned. ERRORS
pthread_sigmask() will fail if: [EINVAL] how is not one of the defined values. LEGACY SYNOPSIS
#include <pthread.h> #include <signal.h> The include file <pthread.h> is necessary. SEE ALSO
sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2), sigsetops(3), compat(5) STANDARDS
pthread_sigmask() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'') BSD
April 27, 2000 BSD

Check Out this Related Man Page

SIGPROCMASK(2)						      BSD System Calls Manual						    SIGPROCMASK(2)

NAME
sigprocmask -- manipulate current signal mask LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> int sigprocmask(int how, const sigset_t * restrict set, sigset_t * restrict oset); DESCRIPTION
The sigprocmask() system call examines and/or changes the current signal mask (those signals that are blocked from delivery). Signals are blocked if they are members of the current signal mask set. If set is not null, the action of sigprocmask() depends on the value of the how argument. The signal mask is changed as a function of the specified set and the current mask. The function is specified by how using one of the following values from <signal.h>: SIG_BLOCK The new mask is the union of the current mask and the specified set. SIG_UNBLOCK The new mask is the intersection of the current mask and the complement of the specified set. SIG_SETMASK The current mask is replaced by the specified set. If oset is not null, it is set to the previous value of the signal mask. When set is null, the value of how is insignificant and the mask remains unset providing a way to examine the signal mask without modification. The system quietly disallows SIGKILL or SIGSTOP to be blocked. In threaded applications, pthread_sigmask(3) must be used instead of sigprocmask(). RETURN VALUES
The sigprocmask() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The sigprocmask() system call will fail and the signal mask will be unchanged if one of the following occurs: [EINVAL] The how argument has a value other than those listed here. SEE ALSO
kill(2), sigaction(2), sigpending(2), sigsuspend(2), fpsetmask(3), pthread_sigmask(3), sigsetops(3) STANDARDS
The sigprocmask() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). BSD
May 7, 2010 BSD
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