psignal(3) — Linux manual page

psignal(3)              Library Functions Manual              psignal(3)

NAME

       psignal, psiginfo - print signal description

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #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
   feature_test_macros(7)):

       psignal():
           Since glibc 2.19:
                   _DEFAULT_SOURCE
           glibc 2.19 and earlier:
               _BSD_SOURCE || _SVID_SOURCE

       psiginfo():
           _POSIX_C_SOURCE >= 200809L

DESCRIPTION

       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
       sigqueue(3)).

RETURN VALUE

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

ATTRIBUTES

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

STANDARDS

       POSIX.1-2008.

HISTORY

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

BUGS

       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

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

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                     psignal(3)

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

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