Code snippet for signals Post: 302465051

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psignal

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