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Command: signalnumber | Section: 3 | Source: NetBSD | File: signalnumber.3
SIGNALNAME(3) FreeBSD Library Functions Manual SIGNALNAME(3)
NAME
signalname, signalnumber, signalnext - convert between signal numbers and
names
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
const char *
signalname(int sig);
int
signalnumber(const char *name);
int
signalnext(int sig);
DESCRIPTION
The signalname() function takes a signal number sig, and returns the name
of that signal. The name returned is locale independent, and can be the
string representation of one of the signal names from <signal.h> such as
SIGHUP, SIGSTOP, SIGKILL, or some similar name, but does not contain the
leading "SIG" prefix.
The return value of signalname() is NULL if sig does not represent a
valid signal number, or if the signal number given has no name.
The signalnumber() function converts the signal name name to the number
corresponding to that signal. The name is handled in a case-insensitive
manner. Any leading "SIG" prefix in name is ignored.
This implementation also accepts rtmax[-n] and rtmin[+n] (where the
optional n is a decimal integer between 0 and SIGRTMAX-SIGRTMIN) to refer
to the real time signals.
The signalnumber() function returns the signal number, or zero (0) if the
name given does not represent a valid signal.
The signalnext() function takes a signal number, and returns the number
of the next available bigger signal number. When no higher signal
numbers remain, it returns zero (0). The parameter sig can be given as
zero (0), to obtain the smallest implemented signal number.
The signalnext() function returns minus one (-1) on error, that is, if
the given signal sig is neither a valid signal number nor zero. It
returns zero when the input signal number, sig, is the biggest available
signal number. Otherwise it returns the signal number of an implemented
signal that is larger than sig and such that there are no implemented
signals with values between sig and the value returned.
The signalnext() function can also be used to determine if a non-zero
signal number is valid or not (0 is always invalid, but cannot be
detected as such this way.) Given the non-zero signal number to check as
sig, if signalnext() returns anything other than minus one (-1) then sig
represents a valid signal number. If the return value is -1 then sig is
invalid.
SEE ALSO
kill(1), intro(2), psignal(3), strsignal(3)
HISTORY
The signalname(), signalnext(), and signalnumber() functions first
appeared in NetBSD 8.0.
FreeBSD 14.1-RELEASE-p8 April 28, 2017 FreeBSD 14.1-RELEASE-p8