tpi_read.lc

linux网络编程中的经典源码

#include    "tpi_daytime.h"##  1 ##src/streams/tpi_read.c##

ssize_t##  2 ##src/streams/tpi_read.c##
tpi_read(int fd, void *buf, size_t len)##  3 ##src/streams/tpi_read.c##
{##  4 ##src/streams/tpi_read.c##
    struct strbuf ctlbuf;##  5 ##src/streams/tpi_read.c##
    struct strbuf datbuf;##  6 ##src/streams/tpi_read.c##
    union T_primitives rcvbuf;##  7 ##src/streams/tpi_read.c##
    int     flags;##  8 ##src/streams/tpi_read.c##

    ctlbuf.maxlen = sizeof(union T_primitives);##  9 ##src/streams/tpi_read.c##
    ctlbuf.buf = (char *) &rcvbuf;## 10 ##src/streams/tpi_read.c##

    datbuf.maxlen = len;## 11 ##src/streams/tpi_read.c##
    datbuf.buf = buf;## 12 ##src/streams/tpi_read.c##
    datbuf.len = 0;## 13 ##src/streams/tpi_read.c##

    flags = 0;## 14 ##src/streams/tpi_read.c##
    Getmsg(fd, &ctlbuf, &datbuf, &flags);## 15 ##src/streams/tpi_read.c##

    if (ctlbuf.len >= (int) sizeof(long)) {## 16 ##src/streams/tpi_read.c##
        if (rcvbuf.type == T_DATA_IND)## 17 ##src/streams/tpi_read.c##
            return (datbuf.len);## 18 ##src/streams/tpi_read.c##
        else if (rcvbuf.type == T_ORDREL_IND)## 19 ##src/streams/tpi_read.c##
            return (0);## 20 ##src/streams/tpi_read.c##
        else## 21 ##src/streams/tpi_read.c##
            err_quit("tpi_read: unexpected type %d", rcvbuf.type);## 22 ##src/streams/tpi_read.c##
    } else if (ctlbuf.len == -1)## 23 ##src/streams/tpi_read.c##
        return (datbuf.len);## 24 ##src/streams/tpi_read.c##
    else## 25 ##src/streams/tpi_read.c##
        err_quit("tpi_read: bad length from getmsg");## 26 ##src/streams/tpi_read.c##
}## 27 ##src/streams/tpi_read.c##