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err(3) - err, errx, verr, verrx, vwarn, vwarnx,, warn, warnx, err, errx, verr, verrx, vwarn, vwarnx,, warn, warnx - formatted error messages - man 3 err

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

     err, verr, errx, verrx, warn, vwarn, warnx, vwarnx, -- formatted error(8,n)

     #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(8,n) mes-
     sage on the standard error(8,n) 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(1,3,1 builtins)(3) -like formatted error(8,n) message is out-
     put.  The output is terminated by a newline character.

     The err(), verr(), warn(), and vwarn() functions append an error(8,n) 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(1,8,3 Search::Dict) up the error(8,n) message.

     The errx() and warnx() functions do not append an error(8,n) message.

     The err(), verr(), errx(), and verrx() functions do not return, but exit(3,n,1 builtins)
     with the value of the argument eval.

     Display the current errno information string(3,n) and exit:

           if(3,n) ((p = malloc(size)) == NULL)
                   err(1, NULL);
           if(3,n) ((fd = open(2,3,n)(file_name, O_RDONLY, 0)) == -1)
                   err(1, "%s", file_name);

     Display an error(8,n) message and exit:

           if(3,n) (tm.tm_hour < START_TIME)
                   errx(1, "too early, wait until %s", start_time_string);

     Warn of an error:

           if(3,n) ((fd = open(2,3,n)(raw_device, O_RDONLY, 0)) == -1)
                   warnx("%s: %s: trying the block device",
                       raw_device, strerror(errno));
           if(3,n) ((fd = open(2,3,n)(block_device, O_RDONLY, 0)) == -1)
                   err(1, "%s", block_device);

     exit(3,n,1 builtins)(3), printf(1,3,1 builtins)(3), perror(1,3)(3), strerror(3)

     The err() and warn() functions first appeared in(1,8) 4.4BSD.

BSD                              March 6, 1999                             BSD

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