error_print_progname - glibc error reporting functions

       #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 mes-
       sage specified by the printf(3)-style format  string  format,  and,  if
       errnum  is  nonzero,  a second colon and a space followed by the string
       given by strerror(errnum).  Any arguments required  for  format  should
       follow format in the argument list.  The output is terminated by a new-
       line character.

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

       If  status has a nonzero 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 pro-
       duced is as for error(), except that after the program name  are  writ-
       ten: a colon, the value of filename, a colon, and the value of linenum.
       The preprocessor values __LINE__ and __FILE__ may be useful when  call-
       ing  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 nonzero, 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 error_at_line().

       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.


GNU                               2010-08-29                          ERROR(3)
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