SYS_RT_SIGPROCMASK(9) Driver Basics SYS_RT_SIGPROCMASK(9)NAME
sys_rt_sigprocmask - change the list of currently blocked signals
SYNOPSIS
long sys_rt_sigprocmask(int how, sigset_t __user * nset, sigset_t __user * oset, size_t sigsetsize);
ARGUMENTS
how
whether to add, remove, or set signals
nset
stores pending signals
oset
previous value of signal mask if non-null
sigsetsize
size of sigset_t type
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SYS_RT_SIGPROCMASK(9)
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SIGPROCMASK(2) BSD System Calls Manual SIGPROCMASK(2)NAME
sigprocmask -- manipulate current signal mask
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 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.
RETURN VALUES
A 0 value indicated that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicated 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), sigsetops(3)STANDARDS
The sigprocmask() function call is expected to conform to IEEE Std 1003.1-1988 (``POSIX.1'').
BSD June 4, 1993 BSD
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