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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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" "..."
74 .Fd #include <stdarg.h>
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 formatted error message is output.
101 The output is terminated by a newline character.
113 functions append an error message obtained from
115 based on a code or the global variable
117 preceeded by another colon and space unless the
131 argument is used to look up the error message.
139 functions use the global variable
141 to look up the error message.
147 functions do not append an error message.
157 functions do not return, but exit with the value of the argument
161 function can be used to specify a function which is called before
163 to perform any necessary cleanup; passing a null function pointer for
165 resets the hook to do nothing.
168 function sets the output stream used by the other functions.
171 argument must be either a pointer to an open stream
172 (possibly already converted to void *)
174 (in which case the output stream is set to standard error).
176 Display the current errno information string and exit:
177 .Bd -literal -offset indent
178 if ((p = malloc(size)) == NULL)
180 if ((fd = open(file_name, O_RDONLY, 0)) == -1)
181 err(1, "%s", file_name);
184 Display an error message and exit:
185 .Bd -literal -offset indent
186 if (tm.tm_hour < START_TIME)
187 errx(1, "too early, wait until %s", start_time_string);
191 .Bd -literal -offset indent
192 if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
193 warnx("%s: %s: trying the block device",
194 raw_device, strerror(errno));
195 if ((fd = open(block_device, O_RDONLY, 0)) == -1)
196 err(1, "%s", block_device);
199 Warn of an error without using the global variable
201 .Bd -literal -offset indent
202 error = my_function(); /* returns a value from <errno.h> */
204 warnc(error, "my_function");
214 functions first appeared in
220 functions first appeared in
226 functions first appeared in