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ERR(3)				   BSD Library Functions Manual 			   ERR(3)

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

     #include <err.h>

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

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

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

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

     #include <stdarg.h>

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

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

     vwarn(const char *fmt, va_list args);

     vwarnx(const char *fmt, va_list args);

     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.

     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);

     exit(3), printf(3), perror(3), strerror(3)

     The err() and warn() functions first appeared in 4.4BSD.

BSD					  March 6, 1999 				      BSD
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