err_set_file man page on FreeBSD

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

     err, verr, errc, verrc, errx, verrx, warn, vwarn, warnc, vwarnc, warnx,
     vwarnx, err_set_exit, err_set_file — formatted error messages

     Standard C Library (libc, -lc)

     #include <err.h>

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

     err_set_exit(void (*exitf)(int));

     err_set_file(void *vfp);

     errc(int eval, int code, const char *fmt, ...);

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

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

     warnc(int code, const char *fmt, ...);

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

     #include <stdarg.h>

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

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

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

     vwarn(const char *fmt, va_list args);

     vwarnc(int code, const char *fmt, va_list args);

     vwarnx(const char *fmt, va_list args);

     The err() and warn() family of functions display a formatted error mes‐
     sage on the standard error output, or on another file specified using the
     err_set_file() function.  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 out‐
     put is terminated by a newline character.

     The err(), errc(), verr(), verrc(), warn(), warnc(), vwarn(), and
     vwarnc() functions append an error message obtained from strerror(3)
     based on a supplied error code value or the global variable errno, pre‐
     ceded by another colon and space unless the fmt argument is NULL.

     In the case of the errc(), verrc(), warnc(), and vwarnc() functions, the
     code argument is used to look up the error message.

     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(), errc(), verrc(), errx(), and verrx() functions do not
     return, but exit with the value of the argument eval.  It is recommended
     that the standard values defined in sysexits(3) be used for the value of
     eval.  The err_set_exit() function can be used to specify a function
     which is called before exit(3) to perform any necessary cleanup; passing
     a null function pointer for exitf resets the hook to do nothing.  The
     err_set_file() function sets the output stream used by the other func‐
     tions.  Its vfp argument must be either a pointer to an open stream (pos‐
     sibly already converted to void *) or a null pointer (in which case the
     output stream is set to standard error).

     Display the current errno information string and exit:

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

     Display an error message and exit:

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

     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(EX_OSFILE, "%s", block_device);

     Warn of an error without using the global variable errno:

	   error = my_function();  /* returns a value from <errno.h> */
	   if (error != 0)
		   warnc(error, "my_function");

     exit(3), fmtmsg(3), printf(3), strerror(3), sysexits(3)

     The err() and warn() functions first appeared in 4.4BSD.  The
     err_set_exit() and err_set_file() functions first appeared in
     FreeBSD 2.1.  The errc() and warnc() functions first appeared in
     FreeBSD 3.0.

BSD				 March 6, 1999				   BSD

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