psignal(3) - Linux manual page (original) (raw)

psignal(3) Library Functions Manual psignal(3)

NAME top

   psignal, psiginfo - print signal description

LIBRARY top

   Standard C library (_libc_, _-lc_)

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 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 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 _siginfot_ 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)](../man2/kill.2.html) or [sigqueue(3)](../man3/sigqueue.3.html)).

RETURN VALUE top

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

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌───────────────────────────────┬───────────────┬────────────────┐
   │ **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)](../man2/sigaction.2.html), [perror(3)](../man3/perror.3.html), [strsignal(3)](../man3/strsignal.3.html), [signal(7)](../man7/signal.7.html)

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Linux man-pages 6.10 2024-07-23 psignal(3)

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