STRSIGNAL(3)               POSIX Programmer's Manual              STRSIGNAL(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NAME
       strsignal -- get name of signal

SYNOPSIS
       #include <string.h>

       char *strsignal(int signum);

DESCRIPTION
       The strsignal() function shall map the signal number in signum to an
       implementation-defined string and shall return a pointer to it.  It
       shall use the same set of messages as the psignal() function.

       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 strsignal() or setlocale().  The returned
       pointer might also be invalidated if the calling thread is terminated.

       The contents of the message strings returned by strsignal() should be
       determined by the setting of the LC__MESSAGES category in the current
       locale.

       The implementation shall behave as if no function defined in this
       standard calls strsignal().

       Since no return value is reserved to indicate an error, an application
       wishing to check for error situations should set errno to 0, then call
       strsignal(), then check errno.

       The strsignal() function need not be thread-safe.

RETURN VALUE
       Upon successful completion, strsignal() shall return a pointer to a
       string. Otherwise, if signum is not a valid signal number, the return
       value is unspecified.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       If signum is not a valid signal number, some implementations return
       NULL, while for others the strsignal() function returns a pointer to a
       string containing an unspecified message denoting an unknown signal.
       POSIX.1-2008 leaves this return value unspecified.

FUTURE DIRECTIONS
       None.

SEE ALSO
       psiginfo(), setlocale()

       The Base Definitions volume of POSIX.1-2017, <string.h>

COPYRIGHT
       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 http://www.opengroup.org/unix/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 .



IEEE/The Open Group                  2017                         STRSIGNAL(3)
