er

来自「Algorithms for Image Processing and Comp」· 代码 · 共 20 行

@c ----------------------------------------------------------------------
@node errno, stdio
@heading @code{errno}
@subheading Syntax

@example
#include <errno.h>

extern int errno;
@end example

@subheading Description

This variable is used to hold the value of the error of the last
function call.  For details about the various error types, please refer
to the file @file{include/errno.h}. 

@xref{perror}