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
8 .\" notice, this list of conditions and the following disclaimer.
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10 .\" notice, this list of conditions and the following disclaimer in the
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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.
16 .\" 4. Neither the name of the University nor the names of its contributors
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18 .\" without specific prior written permission.
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
57 .Fn err "int eval" "const char *fmt" "..."
59 .Fn err_set_exit "void (*exitf)(int)"
61 .Fn err_set_file "void *vfp"
63 .Fn errc "int eval" "int code" "const char *fmt" "..."
65 .Fn errx "int eval" "const char *fmt" "..."
67 .Fn warn "const char *fmt" "..."
69 .Fn warnc "int code" "const char *fmt" "..."
71 .Fn warnx "const char *fmt" "..."
72 .Fd #include <stdarg.h>
74 .Fn verr "int eval" "const char *fmt" "va_list args"
76 .Fn verrc "int eval" "int code" "const char *fmt" "va_list args"
78 .Fn verrx "int eval" "const char *fmt" "va_list args"
80 .Fn vwarn "const char *fmt" "va_list args"
82 .Fn vwarnc "int code" "const char *fmt" "va_list args"
84 .Fn vwarnx "const char *fmt" "va_list args"
90 family of functions display a formatted error message on the standard
91 error output, or on another file specified using the
94 In all cases, the last component of the program name, a colon character,
95 and a space are output.
98 argument is not NULL, the formatted error message is output.
106 the error message string affiliated with the
108 argument is also output,
109 preceded by another colon and space if necessary.
110 In all cases, the output is followed by a newline character.
118 functions use the global variable
134 functions do not return, but exit with the value of the argument
138 function can be used to specify a function which is called before
140 to perform any necessary cleanup; passing a null function pointer for
142 resets the hook to do nothing.
145 function sets the output stream used by the other functions.
148 argument must be either a pointer to an open stream
149 (possibly already converted to void *)
151 (in which case the output stream is set to standard error).
153 Display the current errno information string and exit:
154 .Bd -literal -offset indent
155 if ((p = malloc(size)) == NULL)
157 if ((fd = open(file_name, O_RDONLY, 0)) == -1)
158 err(1, "%s", file_name);
161 Display an error message and exit:
162 .Bd -literal -offset indent
163 if (tm.tm_hour < START_TIME)
164 errx(1, "too early, wait until %s", start_time_string);
168 .Bd -literal -offset indent
169 if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
170 warnx("%s: %s: trying the block device",
171 raw_device, strerror(errno));
172 if ((fd = open(block_device, O_RDONLY, 0)) == -1)
173 err(1, "%s", block_device);
176 Warn of an error without using the global variable
178 .Bd -literal -offset indent
179 error = my_function(); /* returns a value from <errno.h> */
181 warnc(error, "my_function");
191 functions first appeared in
197 functions first appeared in
203 functions first appeared in