PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

PSIGINFO(3P)              POSIX Programmer's Manual             PSIGINFO(3P)

PROLOG         top

       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         top

       psiginfo, psignal — print signal information to standard error

SYNOPSIS         top

       #include <signal.h>

       void psiginfo(const siginfo_t *pinfo, const char *message);
       void psignal(int signum, const char *message);

DESCRIPTION         top

       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
       argument shall be printed first, followed by a <colon>, a <space>,
       and the signal description string indicated by signum, or by the
       signal associated with pinfo.  If the message argument is null or
       points to an empty string, then only the signal description shall be
       printed. For psiginfo(), 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         top

       These functions shall not return a value.

ERRORS         top

       Refer to fputc(3p).

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       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         top

       System V historically has psignal() and psiginfo() in <siginfo.h>.
       However, the <siginfo.h> header is not specified in the Base
       Definitions volume of POSIX.1‐2008, and the type siginfo_t is defined
       in <signal.h>.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       fputc(3p), perror(3p), strsignal(3p)

       The Base Definitions volume of POSIX.1‐2008, signal.h(0p)

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013                        PSIGINFO(3P)

Pages that refer to this page: signal.h(0p)perror(3p)setlocale(3p)strsignal(3p)