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



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(): _SVID_SOURCE || _BSD_SOURCE
       psiginfo(): _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
       sys_siglist: _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 dis‐
       played 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 hard‐
       ware-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.

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
       This  page  is  part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2010-10-06                                 PSIGNAL(3)