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sgetmask(2) [plan9 man page]

SGETMASK(2)						     Linux Programmer's Manual						       SGETMASK(2)

sgetmask, ssetmask - manipulation of signal mask (obsolete) SYNOPSIS
long sgetmask(void); long ssetmask(long newmask); Note: There are no glibc wrappers for these system calls; see NOTES. DESCRIPTION
These system calls are obsolete. Do not use them; use sigprocmask(2) instead. sgetmask() returns the signal mask of the calling process. ssetmask() sets the signal mask of the calling process to the value given in newmask. The previous signal mask is returned. The signal masks dealt with by these two system calls are plain bit masks (unlike the sigset_t used by sigprocmask(2)); use sigmask(3) to create and inspect these masks. RETURN VALUE
sgetmask() always successfully returns the signal mask. ssetmask() always succeeds, and returns the previous signal mask. ERRORS
These system calls always succeed. VERSIONS
Since Linux 3.16, support for these system calls is optional, depending on whether the kernel was built with the CONFIG_SGETMASK_SYSCALL option. CONFORMING TO
These system calls are Linux-specific. NOTES
Glibc does not provide wrappers for these obsolete system calls; in the unlikely event that you want to call them, use syscall(2). These system calls are unaware of signal numbers greater than 31 (i.e., real-time signals). These system calls do not exist on x86-64. It is not possible to block SIGSTOP or SIGKILL. SEE ALSO
sigprocmask(2), signal(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2017-09-15 SGETMASK(2)

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SIGSUSPEND(2)						     Linux Programmer's Manual						     SIGSUSPEND(2)

sigsuspend - wait for a signal SYNOPSIS
#include <signal.h> int sigsuspend(const sigset_t *mask); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigsuspend(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE DESCRIPTION
sigsuspend() temporarily replaces the signal mask of the calling process with the mask given by mask and then suspends the process until delivery of a signal whose action is to invoke a signal handler or to terminate a process. If the signal terminates the process, then sigsuspend() does not return. If the signal is caught, then sigsuspend() returns after the sig- nal handler returns, and the signal mask is restored to the state before the call to sigsuspend(). It is not possible to block SIGKILL or SIGSTOP; specifying these signals in mask, has no effect on the process's signal mask. RETURN VALUE
sigsuspend() always returns -1, normally with the error EINTR. ERRORS
EFAULT mask points to memory which is not a valid part of the process address space. EINTR The call was interrupted by a signal. CONFORMING TO
Normally, sigsuspend() is used in conjunction with sigprocmask(2) in order to prevent delivery of a signal during the execution of a criti- cal code section. The caller first blocks the signals with sigprocmask(2). When the critical code has completed, the caller then waits for the signals by calling sigsuspend() with the signal mask that was returned by sigprocmask(2) (in the oldset argument). See sigsetops(3) for details on manipulating signal sets. SEE ALSO
kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), sigsetops(3), sigwait(3), signal(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2008-08-29 SIGSUSPEND(2)
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