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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():
         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, psig-
     info() 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).

     +----------------------+---------------+----------------+
     |Interface             | Attribute     | Value          |
     +----------------------+---------------+----------------+
     |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.