The Open Group Base Specifications Issue 6
IEEE Std 1003.1-2001
Copyright © 2001 The IEEE and The Open Group, All Rights reserved.

NAME

siginterrupt - allow signals to interrupt functions

SYNOPSIS

[XSI] [Option Start] #include <signal.h>

int siginterrupt(int sig, int flag); [Option End]

DESCRIPTION

The siginterrupt() function shall change the restart behavior 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;
    else
        act.sa_flags |= SA_RESTART;
    ret = sigaction(sig, &act, NULL);
    return ret;
}

RETURN VALUE

Upon successful completion, siginterrupt() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.

ERRORS

The siginterrupt() function shall fail if:

[EINVAL]
The sig argument is not a valid signal number.
The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

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

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

Signal Concepts , sigaction() , the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>

CHANGE HISTORY

First released in Issue 4, Version 2.

Issue 5

Moved from X/OPEN UNIX extension to BASE.

End of informative text.
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