NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON

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

NAME         top

       psignal, psiginfo - print signal message

SYNOPSIS         top

       #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         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 sigqueue(3)).

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

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
       attributes(7).

       ┌──────────────────────┬───────────────┬────────────────┐
       │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 4.08 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
       https://www.kernel.org/doc/man-pages/.

GNU                              2016-03-15                       PSIGNAL(3)