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)

Linux man-pages 6.7                                2023-10-31                                         psignal(3)