SET_CURRENT_BLOCKED(9) Driver Basics SET_CURRENT_BLOCKED(9)NAME
set_current_blocked - change current->blocked mask
void set_current_blocked(sigset_t * newset);
It is wrong to change ->blocked directly, this helper should be used to ensure the process can't miss a shared signal we are going to
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SET_CURRENT_BLOCKED(9)
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sigemptyset(3) Library Functions Manual sigemptyset(3)NAME
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - Creates and manipulates signal masks
Standard C Library (libc.so, libc.a)
int sigemptyset (
int sigfillset (
int sigaddset (
int sig_number );
int sigdelset (
int sig_number );
int sigismember (
int sig_number );
Interfaces documented on this reference page conform to industry standards as follows:
sigemptyset(), sigfillset(), sigaddset(), sigdelset() sigismember(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies the signal set. Specifies the individual signal.
The sigemptyset(), sigfillset(), sigaddset(), sigdelset(), and sigismember() functions manipulate sets of signals. These functions operate
on data objects that can be addressed by the application, not on any set of signals known to the system, such as the set blocked from
delivery to a process or the set pending for a process.
The sigemptyset() function initializes the signal set pointed to by the set parameter such that all signals are excluded. The sigfillset()
function initializes the signal set pointed to by the set parameter such that all signals are included. A call to either the sigfillset()
or sigemptyset() function must be made at least once for each object of the type sigset_t prior to any other use of that object.
The sigaddset() and sigdelset() functions respectively add and delete the individual signal specified by the sig_number parameter from the
signal set specified by the set parameter. The sigismember() function tests whether the sig_number parameter is a member of the signal set
pointed to by the set parameter.
To generate and use a signal mask that blocks only the SIGINT signal from delivery, enter: #include <signal.h> int return_value; sigset_t
. . . sigemptyset(&newset); sigaddset(&newset, SIGINT); return_value = sigprocmask (SIG_SETMASK, &newset, NULL);
Upon successful completion, the sigismember() function returns a value of 1 if the specified signal is a member of the specified set, or a
value of 0 (zero) if it is not. Upon successful completion, the other functions return a value of 0. For all the preceding functions, if
an error is detected, a value of -1 is returned and errno is set to indicate the error.
The sigfillset(), sigdelset(), sigismember(), and sigaddset() functions set errno to the specified values for the following conditions: The
value of the sig_number parameter is not a valid signal number.
Functions: sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2)
Standards: standards(5) delim off
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