.TH ERROR 2
.SH NAME
estrdup, emalloc, erealloc, errinit, noerror, error, warn, catcherror, dprint \- local error handling utilities
.SH SYNOPSIS
.B #include <u.h>
.br
.B #include <libc.h>
.br
.B #include <error.h>
.PP
.B
char*	estrdup(char*)
.br
.B
void*	emalloc(int);
.br
.B
void*	erealloc(void*,int)
.br
.B
void	dbgprint(char* fmt, ...)
.br
.B
void	errinit(Error* e)
.br
.B
void	noerror(void)
.br
.B
void	error(char* msg, ...)
.br
.B
void	warn(char* msg, ...)
.br
.B
void	catcherror(void)
.SH DESCRIPTION
These routiles are tools for error handling.
The ones named like standard functions with the letter
.B e
prepended behave as expected. However, they check that the standard routine did its
work and call
.IR sysfatal (2)
otherwise.
.PP
.IR catcherror ,
.IR noerror ,
.IR error ,
and
.IR errinit
provide exeption handling for C, in the same style of the similar routines used in
the kernel. The only difference is that
.I errinit
should be called before using any other. They can be used both with and without
the
.IR thread (2)
library.
.PP
.I  Dprint
is like
.IR fprint (2)
but prints only if the global
.B debug
is true. Beware that it is a macro and has a conditional statement. Always suround it
with braces when used within
.B if
statements.
.SH SOURCE
.B /sys/src/liberror
.SH EXAMPLE
Catch an error, and raise one.
.PP
.EX
void f(void)
{
	error("raise this!");
}

void
main(int argc, char **argv)
{
	Error	e;
	errinit(&e);
	if (catcherror()){
		sysfatal("catched: %r");
	}
	f();
	noerror();
}
.EE