2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
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12 .\" 3. All advertising materials mentioning features or use of this software
13 .\" must display the following acknowledgement:
14 .\" This product includes software developed by the University of
15 .\" California, Berkeley and its contributors.
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20 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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32 .\" From: @(#)err.3 8.1 (Berkeley) 6/9/93
53 .Nd formatted error messages
59 .Fn err "int eval" "const char *fmt" "..."
61 .Fn err_set_exit "void (*exitf)(int)"
63 .Fn err_set_file "void *vfp"
65 .Fn errc "int eval" "int code" "const char *fmt" "..."
67 .Fn errx "int eval" "const char *fmt" "..."
69 .Fn warn "const char *fmt" "..."
71 .Fn warnc "int code" "const char *fmt" "..."
73 .Fn warnx "const char *fmt" "..."
76 .Fn verr "int eval" "const char *fmt" "va_list args"
78 .Fn verrc "int eval" "int code" "const char *fmt" "va_list args"
80 .Fn verrx "int eval" "const char *fmt" "va_list args"
82 .Fn vwarn "const char *fmt" "va_list args"
84 .Fn vwarnc "int code" "const char *fmt" "va_list args"
86 .Fn vwarnx "const char *fmt" "va_list args"
92 family of functions display a formatted error message on the standard
93 error output, or on another file specified using the
96 In all cases, the last component of the program name, a colon character,
97 and a space are output.
100 argument is not NULL, the
102 -like formatted error message is output.
103 The output is terminated by a newline character.
115 functions append an error message obtained from
117 based on a code or the global variable
119 preceded by another colon and space unless the
133 argument is used to look up the error message.
141 functions use the global variable
143 to look up the error message.
149 functions do not append an error message.
159 functions do not return, but exit with the value of the argument
163 function can be used to specify a function which is called before
165 to perform any necessary cleanup; passing a null function pointer for
167 resets the hook to do nothing.
170 function sets the output stream used by the other functions.
173 argument must be either a pointer to an open stream
174 (possibly already converted to void *)
176 (in which case the output stream is set to standard error).
178 Display the current errno information string and exit:
179 .Bd -literal -offset indent
180 if ((p = malloc(size)) == NULL)
182 if ((fd = open(file_name, O_RDONLY, 0)) == -1)
183 err(1, "%s", file_name);
186 Display an error message and exit:
187 .Bd -literal -offset indent
188 if (tm.tm_hour < START_TIME)
189 errx(1, "too early, wait until %s", start_time_string);
193 .Bd -literal -offset indent
194 if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
195 warnx("%s: %s: trying the block device",
196 raw_device, strerror(errno));
197 if ((fd = open(block_device, O_RDONLY, 0)) == -1)
198 err(1, "%s", block_device);
201 Warn of an error without using the global variable
203 .Bd -literal -offset indent
204 error = my_function(); /* returns a value from <errno.h> */
206 warnc(error, "my_function");
217 functions first appeared in
223 functions first appeared in
229 functions first appeared in