Man page - bsd_signal(3)

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Manual

bsd_signal

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
VERSIONS
STANDARDS
HISTORY
SEE ALSO

NAME

bsd_signal - signal handling with BSD semantics

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <signal.h>

typedef void (*sighandler_t)(int);

sighandler_t bsd_signal(int signum , sighandler_t handler );

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

bsd_signal ():
Since glibc 2.26:
_XOPEN_SOURCE >= 500
&& ! (_POSIX_C_SOURCE >= 200809L)
glibc 2.25 and earlier:
_XOPEN_SOURCE

DESCRIPTION

The bsd_signal () function takes the same arguments, and performs the same task, as signal (2).

The difference between the two is that bsd_signal () is guaranteed to provide reliable signal semantics, that is: a) the disposition of the signal is not reset to the default when the handler is invoked; b) delivery of further instances of the signal is blocked while the signal handler is executing; and c) if the handler interrupts a blocking system call, then the system call is automatically restarted. A portable application cannot rely on signal (2) to provide these guarantees.

RETURN VALUE

The bsd_signal () function returns the previous value of the signal handler, or SIG_ERR on error.

ERRORS

As for signal (2).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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VERSIONS

Use of bsd_signal () should be avoided; use sigaction (2) instead.

On modern Linux systems, bsd_signal () and signal (2) are equivalent. But on older systems, signal (2) provided unreliable signal semantics; see signal (2) for details.

The use of sighandler_t is a GNU extension; this type is defined only if the _GNU_SOURCE feature test macro is defined.

STANDARDS

None.

HISTORY

4.2BSD, POSIX.1-2001. Removed in POSIX.1-2008, recommending the use of sigaction (2) instead.

SEE ALSO

sigaction (2), signal (2), sysv_signal (3), signal (7)