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SIGBLOCK(2) Linux Programmer's Manual SIGBLOCK(2)
sigblock, siggetmask, sigsetmask, sigmask - manipulate the signal mask
int sigblock(int mask);
int sigsetmask(int mask);
int sigmask(int signum);
This interface is made obsolete by sigprocmask(2).
The sigblock system call adds the signals specified in mask to the set of signals cur-
rently being blocked from delivery.
The sigsetmask system call replaces the set of blocked signals totally with a new set
specified in mask. Signals are blocked if the corresponding bit in mask is a 1.
The current set of blocked signals can be obtained using siggetmask.
The sigmask macro is provided to construct the mask for a given signum.
siggetmask returns the current set of masked signals.
sigsetmask and sigblock return the previous set of masked signals.
Prototypes for these functions are only available if _BSD_SOURCE is defined before the
inclusion of any system header file.
It is not possible to block SIGKILL or SIGSTOP - this restriction is silently imposed by
4.4BSD. These function calls appeared in BSD 4.3 and are deprecated. Use the POSIX signal
facilities for new programs.
kill(2), sigprocmask(2), signal(7)
Linux 1.3 1995-08-31 SIGBLOCK(2)
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