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


sigsuspend - wait for a signal


#include <signal.h> int sigsuspend(const sigset_t *mask);


sigsuspend() temporarily replaces the signal mask of the calling pro- cess 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 signal 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 sig- nals in mask, has no effect on the process's signal mask.


sigsuspend() always returns -1, normally with the error 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.


Normally, sigsuspend() is used in conjunction with sigprocmask() in order to prevent delivery of a signal during the execution of a criti- cal code section. The caller first blocks the signals with sigproc- mask(). 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() (in the oldset argument). See sigsetops(3) for details on manipulating signal sets.




kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2) , sigsetops(3), signal(7) Linux 2.6.13 2005-09-15 SIGSUSPEND(2)

1994 Man-cgi 1.15, Panagiotis Christias <>