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Annotation of xinu/sys/udpecho.c, revision 1.1

1.1     ! root        1: /* udpecho.c - udpecho */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: #define        MAXECHO 600             /* maximum size of echoed datagram      */
        !             8: static char    buff[MAXECHO];  /* here because the stack may be small  */
        !             9: 
        !            10: /*------------------------------------------------------------------------
        !            11:  *  udpecho  -  UDP echo server process (runs forever in background)
        !            12:  *------------------------------------------------------------------------
        !            13:  */
        !            14: PROCESS        udpecho()
        !            15: {
        !            16:        int     dev, len;
        !            17: 
        !            18:        if ( (dev=open(INTERNET, ANYFPORT, UECHO)) == SYSERR) {
        !            19:                printf("udpecho: open fails\n");
        !            20:                return(SYSERR);
        !            21:        }
        !            22:        while ( TRUE ) {
        !            23:                len = read(dev, buff, MAXECHO);
        !            24:                write(dev, buff, len);
        !            25:        }
        !            26: }

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