sunos man page for errno

perror(3C)																perror(3C)

NAME
       perror, errno - print system error messages

SYNOPSIS
       #include <stdio.h>

       void perror(const char *s);
       #include <errno.h>
       int errno;

       The  perror()  function	produces a message on the standard error output (file descriptor 2) describing the last error encountered during a
       call to a system or library function. The argument string s is printed, followed by a colon and a blank, followed by the message and a NEW-
       LINE  character.   If s is a null pointer or points to a null string, the colon is not printed. The argument string should include the name
       of the program that incurred the error. The error number is taken from the external variable errno, which is set when errors occur but  not
       cleared when non-erroneous calls are made. See intro(2).

       In  the case of multithreaded applications, the -mt option must be specified on the command line at compilation time (see threads(5)). When
       the -mt option is specified, errno becomes a macro that enables each thread to have its own errno. This errno macro can be used	on  either
       side of the assignment as though it were a variable.

USAGE
       Messages printed from this function are in the native language specified by the LC_MESSAGES locale category.  See setlocale(3C).

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       intro(2), fmtmsg(3C), gettext(3C), setlocale(3C), strerror(3C), attributes(5), standards(5), threads(5)

								    31 Mar 2005 							perror(3C)