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.

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 .