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.TH STRSIGNAL "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

strsignal

\(em get name of signal

.SH SYNOPSIS

.LP

.nf

#include <string.h>

.P

char *strsignal(int \fIsignum\fP);

.fi

.SH DESCRIPTION

The

\fIstrsignal\fR()

function shall map the signal number in

.IR signum

to an implementation-defined string and shall return a pointer to it.

It shall use the same set of messages as the

\fIpsignal\fR()

function.

.P

The application shall not modify the string returned. The returned

pointer might be invalidated or the string content might be overwritten

by a subsequent call to

\fIstrsignal\fR()

or

\fIsetlocale\fR().

.P

The contents of the message strings returned by

\fIstrsignal\fR()

should be determined by the setting of the

.IR LC_MESSAGES

category in the current locale.

.P

The implementation shall behave as if no function defined in this

standard calls

\fIstrsignal\fR().

.P

Since no return value is reserved to indicate an error, an application

wishing to check for error situations should set

.IR errno

to 0, then call

\fIstrsignal\fR(),

then check

.IR errno .

.P

The

\fIstrsignal\fR()

function need not be thread-safe.

.SH "RETURN VALUE"

Upon successful completion,

\fIstrsignal\fR()

shall return a pointer to a string. Otherwise, if

.IR signum

is not a valid signal number, the return value is unspecified.

.SH ERRORS

No errors are defined.

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

If

.IR signum

is not a valid signal number, some implementations return NULL, while

for others the

\fIstrsignal\fR()

function returns a pointer to a string containing an unspecified

message denoting an unknown signal. POSIX.1\(hy2008 leaves this return

value unspecified.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fIpsiginfo\fR\^(\|)",

.IR "\fIsetlocale\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "\fB<string.h>\fP"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the

event of any discrepancy between this version and the original IEEE and

The Open Group Standard, the original IEEE and The Open Group Standard

is the referee document. The original Standard can be obtained online at

http://www.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .