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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PSIGINFO(3P) POSIX Programmer's Manual PSIGINFO(3P)
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.
psiginfo, psignal — write signal information to standard error
#include <signal.h>
void psiginfo(const siginfo_t *pinfo, const char *message);
void psignal(int signum, const char *message);
The psiginfo() and psignal() functions shall write a language-
dependent message associated with a signal number to the standard
error stream as follows:
* First, if message is not a null pointer and is not the empty
string, the string pointed to by the message argument shall be
written, followed by a <colon> and a <space>.
* Then the signal description string associated with signum or
with the signal indicated by pinfo shall be written, followed
by a <newline>.
For psiginfo(), the application shall ensure that 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.
These functions shall not return a value.
Refer to fputc(3p).
The following sections are informative.
None.
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.1‐2017, and the type siginfo_t is
defined in <signal.h>.
None.
fputc(3p), perror(3p), strsignal(3p)
The Base Definitions volume of POSIX.1‐2017, signal.h(0p)
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 PSIGINFO(3P)
Pages that refer to this page: signal.h(0p), perror(3p), setlocale(3p), strsignal(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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