tcpgetc.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 63 行

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date	97.09.21.19.30.11;	author dls;	state Dist;
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date	94.01.14.04.11.50;	author dls;	state v2e1;
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@/* tcpgetc.c - tcpgetc */

#include <conf.h>
#include <kernel.h>
#include <proc.h>
#include <network.h>

/*------------------------------------------------------------------------
 *  tcpgetc  -  read one character from a TCP pseudo-device
 *------------------------------------------------------------------------
 */
int tcpgetc(pdev)
struct	devsw	*pdev;
{
	char	ch;
	int	cc;

	cc = tcpread(pdev, &ch, 1);
	if (cc < 0)
		return SYSERR;
	else if (cc == 0)
		return EOF;
	/* else, valid data */
	return ch;
}
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