The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group


siginterrupt - allow signals to interrupt functions


#include <signal.h>

int siginterrupt(int sig, int flag);


The siginterrupt() function is used to change the restart behaviour when a function is interrupted by the specified signal. The function siginterrupt(sig, flag) has an effect as if implemented as:

siginterrupt(int sig, int flag) {
    int ret;
    struct sigaction act;

    (void) sigaction(sig, NULL, &act);
    if (flag)
        act.sa_flags &= ~SA_RESTART;
        act.sa_flags |= SA_RESTART;
    ret = sigaction(sig, &act, NULL);
    return ret;


Upon successful completion, siginterrupt() returns 0. Otherwise -1 is returned and errno is set to indicate the error.


The siginterrupt() function will fail if:
The sig argument is not a valid signal number.




The siginterrupt() function supports programs written to historical system interfaces. A portable application, when being written or rewritten, should use sigaction() with the SA_RESTART flag instead of siginterrupt().




sigaction(), <signal.h>.

UNIX ® is a registered Trademark of The Open Group.
Copyright © 1997 The Open Group
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