NAME

siginterrupt — allow signals to interrupt functions

SYNOPSIS

[OB XSI]
#include <signal.h>

int siginterrupt(int sig, int flag);

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:

int 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. Applications should use the sigaction(3) with the SA_RESTART flag instead of the obsolescent siginterrupt () function.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

V2_chap02(3), sigaction(3)

XBD <signal.h>

CHANGE HISTORY

First released in Issue 4, Version 2.

Issue 5

Moved from X/OPEN UNIX extension to BASE.

Issue 6

IEEE Std 1003.1-2001 (“POSIX.1”)/Cor 1-2002, item XSH/TC1/D6/59 is applied, correcting the declaration in the sample implementation given in the DESCRIPTION.

Issue 7

The siginterrupt () function is marked obsolescent.

End of informative text.