1 .\" Copyright (C) 2006 Justin Pryzby <pryzbyj@justinpryzby.com>
2 .\" and Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
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24 .\" glibc manual and source
25 .TH ERROR 3 2010-08-29 "GNU" "Linux Programmer's Manual"
27 error, error_at_line, error_message_count, error_one_per_line,
28 error_print_progname \- glibc error reporting functions
33 \fBvoid error(int \fIstatus, \fBint\fI errnum, \
34 \fBconst char *\fIformat, \fB...);
36 \fBvoid error_at_line(int \fIstatus, \fBint \fIerrnum, \
37 \fBconst char *\fIfilename,
38 \fBunsigned int \fIlinenum, \
39 \fBconst char *\fIformat, \fB...);
41 \fBextern unsigned int \fIerror_message_count\fP;
43 \fBextern int \fIerror_one_per_line\fP;
45 \fBextern void (* \fIerror_print_progname\fB) (void);
49 is a general error-reporting function.
54 the program name, a colon and a space, the message specified by the
56 format string \fIformat\fP, and, if \fIerrnum\fP is
57 nonzero, a second colon and a space followed by the string given by
58 .IR strerror(errnum) .
59 Any arguments required for
64 The output is terminated by a newline character.
66 The program name printed by
68 is the value of the global variable
69 .BR program_invocation_name (3).
70 .I program_invocation_name
71 initially has the same value as
74 The value of this variable can be modified to change the output of
77 If \fIstatus\fP has a nonzero value, then
81 to terminate the program using the given value as the exit status.
85 function is exactly the same as
87 except for the addition of the arguments
91 The output produced is as for
93 except that after the program name are written: a colon, the value of
95 a colon, and the value of
97 The preprocessor values \fB__LINE__\fP and
98 \fB__FILE__\fP may be useful when calling
100 but other values can also be used.
101 For example, these arguments could refer to a location in an input file.
103 If the global variable \fIerror_one_per_line\fP is set nonzero,
107 same value of \fIfilename\fP and \fIlinenum\fP will result in only
108 one message (the first) being output.
110 The global variable \fIerror_message_count\fP counts the number of
111 messages that have been output by
114 .BR error_at_line ().
116 If the global variable \fIerror_print_progname\fP
117 is assigned the address of a function
118 (i.e., is not NULL), then that function is called
119 instead of prefixing the message with the program name and colon.
120 The function should print a suitable string to
123 These functions and variables are GNU extensions, and should not be
124 used in programs intended to be portable.
130 .BR program_invocation_name (3),