Section: POSIX Programmer's Manual (3P)
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.
--- get name of signal
char *strsignal(int signum);
function shall map the signal number in
to an implementation-defined string and shall return a pointer to it.
It shall use the same set of messages as the
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
The returned pointer might also be invalidated if the calling thread
The contents of the message strings returned by
should be determined by the setting of the
category in the current locale.
The implementation shall behave as if no function defined in this
Since no return value is reserved to indicate an error, an application
wishing to check for error situations should set
to 0, then call
function need not be thread-safe.
Upon successful completion,
shall return a pointer to a string. Otherwise, if
is not a valid signal number, the return value is unspecified.
No errors are defined.
The following sections are informative.
is not a valid signal number, some implementations return NULL, while
for others the
function returns a pointer to a string containing an unspecified
message denoting an unknown signal. POSIX.1-2008 leaves this return
The Base Definitions volume of POSIX.1-2017,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
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
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