SYS_RT_SIGSUSPEND(9) Driver Basics SYS_RT_SIGSUSPEND(9)NAME
sys_rt_sigsuspend - replace the signal mask for a value with the unewset value until a signal is received
long sys_rt_sigsuspend(sigset_t __user * unewset, size_t sigsetsize);
new signal mask value
size of sigset_t type
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SYS_RT_SIGSUSPEND(9)
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SIGSUSPEND(2) Linux Programmer's Manual SIGSUSPEND(2)NAME
sigsuspend, rt_sigsuspend - wait for a signal
int sigsuspend(const sigset_t *mask);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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.
sigsuspend() always returns -1, with errno set to indicate the error (normally, EINTR).
EFAULT mask points to memory which is not a valid part of the process address space.
EINTR The call was interrupted by a signal; signal(7).
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.
C library/kernel differences
The original Linux system call was named sigsuspend(). However, with the addition of real-time signals in Linux 2.2, the fixed-size,
32-bit sigset_t type supported by that system call was no longer fit for purpose. Consequently, a new system call, rt_sigsuspend(), was
added to support an enlarged sigset_t type. The new system call takes a second argument, size_t sigsetsize, which specifies the size in
bytes of the signal set in mask. This argument is currently required to have the value sizeof(sigset_t) (or the error EINVAL results).
The glibc sigsuspend() wrapper function hides these details from us, transparently calling rt_sigsuspend() when the kernel provides it.
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 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 https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SIGSUSPEND(2)
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