ecufriend.c

一个通讯程序源码

#define DUMP_SCREEN
/*+-------------------------------------------------------------------------
	ecufriend.c -- example of using ecu shared memory access
	[e-mail]

Execute by ecu procedure command:  system -s 'ecufriend '+%itos(%shmid)
To manually execute for perusal, do an ipcs command to find the
shared memory id or HOME pc echo 'shmid='+%itos(%shmid)
Then HOME >ecufriend # where # is replaced by the shmid
--------------------------------------------------------------------------*/
/*+:EDITS:*/
/*:09-10-1992-13:58-wht@n4hgf-ECU release 3.20 */
/*:08-22-1992-15:38-wht@n4hgf-ECU release 3.20 BETA */
/*:07-25-1991-12:56-wht@n4hgf-ECU release 3.10 */
/*:08-14-1990-20:40-wht@n4hgf-ecu3.00-flush old edit history */

#include <stdio.h>
#include <signal.h>
#include <termio.h>
#include <sys/errno.h>
#include "../ecu_types.h"
#include "../ecu_stat.h"
#include <time.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include "../ecushm.h"

ECU_SDS FAR *shm;		/* shared segment pointer */
int shmid;				/* sharged segment id */

/*+-------------------------------------------------------------------------
	main(argc,argv,envp)
--------------------------------------------------------------------------*/
main(argc,argv,envp)
int argc;
char **argv;
char **envp;
{
register itmp;
#ifdef DUMP_SCREEN
int row,col;
unsigned char sch;
#endif

	if(argc < 2)
	{
		printf("usage: ecufriend <ecu-shmid>\n");
			exit(255);
	}
	shmid = atoi(argv[1]);

	if((shm = (ECU_SDS FAR *)shmat(shmid,(char FAR *)0,SHM_RDONLY))
			== (ECU_SDS FAR *)-1)
	{
		perror("shmat");
		exit(1);
	}

	printf("ecu shm address = %08lx shmid=%d revision=%08lx\n",
		shm,shmid,shm->shm_revision);

	if(shm->shm_revision != SHM_REV)
	{
		printf("incompatible shared memory revision (compiled with %08lx)\n",
			SHM_REV);
		exit(1);
	}

	printf("xmit chars=%lu rcvd chars=%lu\n",
		shm->xmit_chars,shm->rcvd_chars);
	printf("The receive cursor position is at column %d row %d\n",
		shm->cursor_y,shm->cursor_x);

	printf("If this program was not executed by a shell that closed it,\n");
	printf("then fd %d is available to us to write and read from the line.\n",
		shm->Liofd);

	if(isatty(shm->Liofd))
		printf("It is available.\n");
	else
		printf("It is not available. Even so, we could re-open %s here\n",
			shm->Lline);

	if(shm->Lmodem_off_hook)
		printf("Hmmm.. we seem to be connected to %s at %s\n",
			shm->Ldescr,shm->Ltelno);

#ifdef DUMP_SCREEN
	printf("screen dump\n");
	printf("-----------\n");
	for(row = 0; row < 43; row++)
	{
		for(col = 0; col < 79; col++)
		{
			sch = shm->screen[row][col];
			if((sch < 0x20) && (sch > 0x7E))
				putc('.',stdout);
			else
				putc(sch,stdout);
		}
		putc('\n',stdout);
	}
#endif

	exit(0);
}	/* end of main */

/* vi: set tabstop=4 shiftwidth=4: */
/* end of ecufriend.c */