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NAME

       psignal, psiginfo - print signal message

SYNOPSIS

       #include <signal.h>

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

       extern const char *const sys_siglist[];

   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
       sys_siglist:
           Since glibc 2.19:
               _DEFAULT_SOURCE
           Glibc 2.19 and earlier:
               _BSD_SOURCE

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)).

       The array sys_siglist holds the signal description strings indexed by signal number.

RETURN VALUE

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

VERSIONS

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

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌──────────────────────┬───────────────┬────────────────┐
       │InterfaceAttributeValue          │
       ├──────────────────────┼───────────────┼────────────────┤
       │psignal(), psiginfo() │ Thread safety │ MT-Safe locale │
       └──────────────────────┴───────────────┴────────────────┘

CONFORMING TO

       POSIX.1-2008, 4.3BSD.

BUGS

       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

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

COLOPHON

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