syserrlst(3) [bsd man page]

SYSERRLST(3)						     Library Functions Manual						      SYSERRLST(3)

NAME

       syserrlst, __errlst - read system error messages from file

SYNOPSIS

       char *
       syserrlst(err)
       int err;

       char *
       __errlst(err, path);
       int err;
       char *path;

DESCRIPTION

       Syserrlst(3) reads the error message string corresponding to err from the file /etc/syserrlst.

       __errlst(3)  reads  the	error  message	string	corresponding to err from the file path.  The file path must be in the format described in
       syserrlst(5).

       NULL is returned if err is out of bounds (negative or greater than the highest message number in /etc/syserrlst or path) or  if	the  error
       message file can not be opened.	It is the responsibility of the caller (strerror(3)) to check for and properly handle the NULL return.

RETURN VALUE

       NULL  if  an error was encountered in opening the error message file, if the error was out of bounds, or if the file did not start with the
       correct magic number.  Otherwise a char * is returned pointing to a static buffer containing the text of the error message.

ERRORS

       syserrlst(3) and __errlst(3) can return any of the errors for the open(2), lseek(2), or read(2) system calls.

SEE ALSO

       perror(3), strerror(3), syserrlst(5)

HISTORY

       syserrlst(3), and __errlst(3) were created for 2.11BSD with the aim of saving 2kb of Data space in programs which called perror(3), or str-
       error(3).

BUGS

       The information is stored in a static buffer.

3rd Berkeley Distribution					  March 26, 1996						      SYSERRLST(3)

ERR(3)							   BSD Library Functions 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);

SEE ALSO

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

HISTORY

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

BSD
								   March 6, 1999							       BSD