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SuSE 11.3 - man page for verrx (suse section 3)

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

NAME
       err, verr, errx, verrx, warn, vwarn, warnx, vwarnx - formatted error messages

SYNOPSIS
       #include <err.h>

       void err(int eval, const char *fmt, ...);

       void errx(int eval, const char *fmt, ...);

       void warn(const char *fmt, ...);

       void warnx(const char *fmt, ...);

       #include <stdarg.h>

       void verr(int eval, const char *fmt, va_list args);

       void verrx(int eval, const char *fmt, va_list args);

       void vwarn(const char *fmt, va_list args);

       void vwarnx(const char *fmt, va_list args);

DESCRIPTION
       The err() and warn() family of functions display a formatted error message on the standard
       error output.  In all cases, the last component of the program name,  a	colon  character,
       and  a  space  are  output.  If the fmt argument is not NULL, the printf(3)-like formatted
       error message is output.  The output is terminated by a newline character.

       The err(), verr(), warn(), and vwarn() functions append an  error  message  obtained  from
       strerror(3)  based  on  a code or the global variable errno, preceded by another colon and
       space unless the fmt argument is NULL.

       The err(), verr(), warn(), and vwarn() functions use the global variable errno to look  up
       the error message.

       The errx() and warnx() functions do not append an error message.

       The err(), verr(), errx(), and verrx() functions do not return, but exit with the value of
       the argument eval.

EXAMPLES
       Display the current errno information string and exit:

	   if ((p = malloc(size)) == NULL)
	       err(1, NULL);
	   if ((fd = open(file_name, O_RDONLY, 0)) == -1)
	       err(1, "%s", file_name);

       Display an error message and exit:

	   if (tm.tm_hour < START_TIME)
	       errx(1, "too early, wait until %s", start_time_string);

       Warn of an error:

	   if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
	       warnx("%s: %s: trying the block device",
		       raw_device, strerror(errno));
	   if ((fd = open(block_device, O_RDONLY, 0)) == -1)
	       err(1, "%s", block_device);

CONFORMING TO
       These functions are nonstandard BSD extensions.

SEE ALSO
       error(3), exit(3), perror(3), printf(3), strerror(3)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A  description  of  the
       project,   and	information  about  reporting  bugs,  can  be  found  at  http://www.ker-
       nel.org/doc/man-pages/.

Linux					    2007-12-28					   ERR(3)
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