01-26-2013
Handling Signals in System Calls
What will happen if signal comes while a system call is being executed?
How it will be handled?
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LEARN ABOUT NETBSD
sigprocmask
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() function 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 parameter how. 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:
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 modifica-
tion.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.
RETURN VALUES
A 0 value indicates that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicate the reason.
ERRORS
The sigprocmask() call will fail and the signal mask will be unchanged if one of the following occurs:
[EINVAL] how has a value other than those listed here.
SEE ALSO
kill(2), sigaction(2), sigsuspend(2), pthread_sigmask(3), sigsetops(3), signal(7)
STANDARDS
The sigprocmask() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
BSD
June 4, 1993 BSD