error.3

linux下qmail的源码 本人加了一些注释

.TH error 3
.SH NAME
error \- syscall error codes
.SH SYNTAX
.B #include <error.h>

extern int \fBerrno\fP;

extern int \fBerror_intr\fP;
.br
extern int \fBerror_nomem\fP;
.br
extern int \fBerror_noent\fP;
.br
extern int \fBerror_txtbsy\fP;
.br
extern int \fBerror_io\fP;
.br
extern int \fBerror_exist\fP;
.br
extern int \fBerror_timeout\fP;
.br
extern int \fBerror_inprogress\fP;
.br
extern int \fBerror_wouldblock\fP;
.br
extern int \fBerror_again\fP;
.br
extern int \fBerror_pipe\fP;
.br
extern int \fBerror_perm\fP;
.br
extern int \fBerror_acces\fP;
.SH DESCRIPTION
UNIX syscalls provide detailed error codes in the
.B errno
variable.
The
.B error
library provides portable names for a variety of possible
.B errno
values.
.SH "SEE ALSO"
error_str(3),
error_temp(3)