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PSIGINFO(3P)               POSIX Programmer's Manual              PSIGINFO(3P)
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
       psiginfo, psignal -- print signal information to standard error
SYNOPSIS
       #include <signal.h>
       void psiginfo(const siginfo_t *pinfo, const char *message);
       void psignal(int signum, const char *message);
DESCRIPTION
       The psiginfo() and psignal() functions shall print  a  message  out  on
       stderr  associated  with a signal number. If message is not null and is
       not the empty string, then the string pointed to by the  message  argu-
       ment  shall be printed first, followed by a <colon>, a <space>, and the
       signal description string indicated by signum, or by the signal associ-
       ated with pinfo.  If the message argument is null or points to an empty
       string, then only the signal description shall be  printed.  For  psig-
       info(),  the argument pinfo references a valid siginfo_t structure. For
       psignal(), if signum is not a valid  signal  number,  the  behavior  is
       implementation-defined.
       The psiginfo() and psignal() functions shall not change the orientation
       of the standard error stream.
       The psiginfo() and psignal() functions shall mark for update  the  last
       data  modification  and  last file status change timestamps of the file
       associated with the standard error stream at some  time  between  their
       successful  completion  and  exit(),  abort(),  or  the  completion  of
       fflush() or fclose() on stderr.
       The psiginfo() and psignal() functions shall not change the setting  of
       errno if successful.
       On  error,  the  psiginfo() and psignal() functions shall set the error
       indicator for the stream to which stderr points, and shall set errno to
       indicate the error.
       Since  no  value is returned, an application wishing to check for error
       situations should set errno to 0, then call  psiginfo()  or  psignal(),
       then check errno.
RETURN VALUE
       These functions shall not return a value.
ERRORS
       Refer to fputc().
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       As an alternative to setting errno to zero before the call and checking
       if it is non-zero afterwards, applications can use ferror()  to  detect
       whether psiginfo() or psignal() encountered an error.
       An application wishing to use this method to check for error situations
       should call clearerr(stderr) before calling  psiginfo()  or  psignal(),
       then  if  ferror(stderr) returns non-zero, the value of errno indicates
       which error occurred.
RATIONALE
       System V historically has  psignal()  and  psiginfo()  in  <siginfo.h>.
       However,  the  <siginfo.h>  header is not specified in the Base Defini-
       tions volume of POSIX.1-2008, and the  type  siginfo_t  is  defined  in
       <signal.h>.
FUTURE DIRECTIONS
       None.
SEE ALSO
       fputc(), perror(), strsignal()
       The Base Definitions volume of POSIX.1-2008, <signal.h>
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 Electri-
       cal  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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         PSIGINFO(3P)