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.
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.
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.
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
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
IEEE/The Open Group 2013 PSIGINFO(3P)