psignal(3) — Linux manual page


PSIGNAL(3)              Linux Programmer's Manual             PSIGNAL(3)

NAME         top

       psignal, psiginfo - print signal description

SYNOPSIS         top

       #include <signal.h>

       void psignal(int sig, const char *s);
       void psiginfo(const siginfo_t *pinfo, const char *s);

   Feature Test Macro Requirements for glibc (see

           Since glibc 2.19:
           Glibc 2.19 and earlier:
               _BSD_SOURCE || _SVID_SOURCE

           _POSIX_C_SOURCE >= 200809L

DESCRIPTION         top

       The psignal() function displays a message on stderr consisting of
       the string s, a colon, a space, a string describing the signal
       number sig, and a trailing newline.  If the string s is NULL or
       empty, the colon and space are omitted.  If sig is invalid, the
       message displayed will indicate an unknown signal.

       The psiginfo() function is like psignal(), except that it
       displays information about the signal described by pinfo, which
       should point to a valid siginfo_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 for SIGCHLD, and the user ID and
       process ID of the sender, for signals set using kill(2) or

RETURN VALUE         top

       The psignal() and psiginfo() functions return no value.

VERSIONS         top

       The psiginfo() function was added to glibc in version 2.10.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface                      Attribute     Value          │
       │psignal(), psiginfo()          │ Thread safety │ MT-Safe locale │

CONFORMING TO         top

       POSIX.1-2008, 4.3BSD.

BUGS         top

       In glibc versions up to 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 release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at

GNU                            2021-03-22                     PSIGNAL(3)

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