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psignal(3) — Linux manual page

psignal(3)               Library Functions Manualpsignal(3)

NAME        top

       psignal, psiginfo - print signal description

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <signal.h>void psignal(intsig, const char *s);void psiginfo(const siginfo_t *pinfo, const char *s);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):psignal():           Since glibc 2.19:                   _DEFAULT_SOURCE           glibc 2.19 and earlier:               _BSD_SOURCE || _SVID_SOURCEpsiginfo():           _POSIX_C_SOURCE >= 200809L

DESCRIPTION        top

       Thepsignal() function displays a message onstderr consisting of       the strings, a colon, a space, a string describing the signal       numbersig, and a trailing newline.  If the strings is NULL or       empty, the colon and space are omitted.  Ifsig is invalid, the       message displayed will indicate an unknown signal.       Thepsiginfo() function is likepsignal(), except that it displays       information about the signal described bypinfo, which should       point to a validsiginfo_t structure.  As well as the signal       description,psiginfo() displays information about the origin of       the signal, and other information relevant to the signal (e.g.,       the relevant memory address for hardware-generated signals, the       child process ID forSIGCHLD, and the user ID and process ID of       the sender, for signals set usingkill(2) orsigqueue(3)).

RETURN VALUE        top

       Thepsignal() andpsiginfo() functions return no value.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌───────────────────────────────┬───────────────┬────────────────┐       │Interface│Attribute│Value│       ├───────────────────────────────┼───────────────┼────────────────┤       │psignal(),psiginfo()         │ Thread safety │ MT-Safe locale │       └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       glibc 2.10.  POSIX.1-2008, 4.3BSD.

BUGS        top

       Up to glibc 2.12,psiginfo() had the following bugs:       •  In some circumstances, a trailing newline is not printed.       •  Additional details are not displayed for real-time signals.

SEE ALSO        top

sigaction(2),perror(3),strsignal(3),signal(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17psignal(3)

Pages that refer to this page:strsignal(3), system_data_types(7)

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