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ERROR(3)                   Linux Programmer's Manual                  ERROR(3)

       error,  error_at_line,  error_message_count,  error_on_per_line,  error_print_progname  - glibc error reporting

       #include <error.h>

       void error(int status, int errnum, const char *format, ...);

       void error_at_line(int status, int errnum, const char *filename,
                          unsigned int linenum, const char *format, ...);

       extern unsigned int error_message_count;

       extern int error_one_per_line;

       extern void (* error_print_progname) (void);

       error() is a general error reporting function.  It flushes stdout, and then outputs to stderr the program name,
       a  colon and a space, the message specified by the printf(3)-style format string format, and, if errnum is non-
       zero, a second colon and a space followed by the string given by perror(errnum).  Any  arguments  required  for
       format should follow format in the argument list.  The output is terminated by a newline character.

       The  program  name  printed  by  error()  is the value of the global variable program_invocation_name(3).  pro-
       gram_invocation_name initially has the same value as main()'s argv[0].  The value of this variable can be modi-
       fied to change the output of error().

       If  status  has  a non-zero value, then error() calls exit(3) to terminate the program using the given value as
       the exit status.

       The error_at_line() function is exactly the same as error(), except for the addition of the arguments  filename
       and  linenum.   The output produced is as for error(), except that after the program name are written: a colon,
       the value of filename, a colon, and the value of linenum.  The preprocessor values __LINE__ and __FILE__ may be
       useful  when  calling  error_at_line(),  but other values can also be used.  For example, these arguments could
       refer to a location in an input file.

       If the global variable error_one_per_line is set non-zero, a sequence of error_at_line() calls  with  the  same
       value of filename and linenum will result in only one message (the first) being output.

       The  global  variable  error_message_count  counts  the number of messages that have been output by error() and

       If the global variable error_print_progname is assigned the address of a function (i.e.,  is  not  NULL),  then
       that  function is called instead of prefixing the message with the program name and colon.  The function should
       print a suitable string to stderr.

       These functions and variables are GNU extensions, and should not be used in programs intended to be portable.

       err(3), errno(3), exit(3), perror(3), program_invocation_name(3), strerror(3)

       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at

GNU                               2006-04-25                          ERROR(3)