strsignal(3) [mojave man page]

PSIGNAL(3)						   BSD Library Functions Manual 						PSIGNAL(3)

NAME

     psignal, strsignal, sys_siglist, sys_signame -- system signal messages

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     void
     psignal(unsigned sig, const char *s);

     extern const char * const sys_siglist[];
     extern const char * const sys_signame[];

     #include <string.h>

     char *
     strsignal(int sig);

DESCRIPTION

     The psignal() and strsignal() functions locate the descriptive message string for a signal number.

     The strsignal() function accepts a signal number argument sig and returns a pointer to the corresponding message string.

     The psignal() function accepts a signal number argument sig and writes it to the standard error.  If the argument s is non-NULL and does not
     point to the null character, s is written to the standard error file descriptor prior to the message string, immediately followed by a colon
     and a space.  If the signal number is not recognized (sigaction(2)), the string ``Unknown signal'' is produced.

     The message strings can be accessed directly through the external array sys_siglist, indexed by recognized signal numbers.  The external
     array sys_signame is used similarly and contains short, lower-case abbreviations for signals which are useful for recognizing signal names in
     user input.  The defined variable NSIG contains a count of the strings in sys_siglist and sys_signame.

RETURN VALUES

     strsignal() a pointer to the desired message or a NULL value indicating an error.	This string is not to be freed by the caller.  Beginning
     with Mac OSX 10.7, this string is unique to each thread.

ERRORS

     strsignal() will fail and no additional memory will be allocated if one of the following are true:

     [ENOMEM]		There was insufficient memory to allocate storage space for the return value in the running thread.

SEE ALSO

     sigaction(2), perror(3), strerror(3)

HISTORY

     The psignal() function appeared in 4.2BSD.

BSD
								 February 27, 1995							       BSD

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  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.

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 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-10-06								PSIGNAL(3)