Manpage of SIGSUSPEND
SIGSUSPENDSection: Linux Programmer's Manual (2)
NAMEsigsuspend, rt_sigsuspend - wait for a signal
int sigsuspend(const sigset_t *mask);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONsigsuspend() temporarily replaces the signal mask of the calling process with the mask given by maskand 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 signal handler returns, and the signal mask is restored to the state before the call to sigsuspend().
RETURN VALUEsigsuspend() always returns -1, with errnoset to indicate the error (normally, EINTR).
- maskpoints to memory which is not a valid part of the process address space.
- The call was interrupted by a signal; signal(7).
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
Normally, sigsuspend() is used in conjunction with sigprocmask(2) in order to prevent delivery of a signal during the execution of a critical 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 oldsetargument).
See sigsetops(3) for details on manipulating signal sets.
C library/kernel differencesThe 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_ttype 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_ttype. 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 EINVALresults). The glibc sigsuspend() wrapper function hides these details from us, transparently calling rt_sigsuspend() when the kernel provides it.
SEE ALSOkill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), sigsetops(3), sigwait(3), signal(7)
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