Numering of file descriptors

This is a discussion on Numering of file descriptors within the C Programming forums, part of the General Programming Boards category; in wich mode windows system assigns id to file descriptors like socket, in unix system the assignment is in ascending ...

  1. #1
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    Numering of file descriptors

    in wich mode windows system assigns id to file descriptors like socket, in unix system the assignment is in ascending order (the first id's socket is 3 the second 4 and so on).
    In windows i saw that the first id's socket is 100, the second 104, the third 108 and so on...

    is it right?

    thank u.

    bye

  2. #2
    ATH0 quzah's Avatar
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    I believe it should be the same. Incremented by one. I just did a brief check and didn't see anything right off. Granted I only spent two seconds with a search engine, but if you give it a few more, you'll likely come up with something.

    One quick reference I noted is the ever popular sockets web site.

    [edit] Curses, foiled again! [/edit]

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
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    my problem is this:
    i want to use the select() function to use non blocking sockets,
    when i put a socket(file) descriptor in FD_SET i don't know how to iterate on fd_set to find the ready socket,
    in unix is quite simple because if u close all stream than the socket descriptor is from 0 to FD_SETSIZE(64).

    do u understand?

  4. #4
    End Of Line Hammer's Avatar
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    Read here or try vVv's Unix FAQ (the principles are the same for Windows socket I believe).
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  5. #5
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    view this unix system program:

    /*
    ** select.c -- a select() demo
    */

    #include <stdio.h>
    #include <sys/time.h>
    #include <sys/types.h>
    #include <unistd.h>

    #define STDIN 0 // file descriptor for standard input

    int main(void)
    {
    struct timeval tv;
    fd_set readfds;

    tv.tv_sec = 2;
    tv.tv_usec = 500000;

    FD_ZERO(&readfds);
    FD_SET(STDIN, &readfds);

    // don't care about writefds and exceptfds:
    select(STDIN+1, &readfds, NULL, NULL, &tv);

    if (FD_ISSET(STDIN, &readfds))
    printf("A key was pressed!\n");
    else
    printf("Timed out.\n");

    return 0;
    }

    see the select function (STDIN+1) in windows i can't dothis because the fd is not in ascending order....

    please help me!

  6. #6
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    for ( i = 0 ; i < FD_SETSIZE ; i++ ) if ( FD_ISSET(i,&set) ) { /* do stuff */ }

    i can't do this because in windows FD_SETSIZE is 64 and if the firs socket descriptor is 100 it never enter in that loop......doh!

  7. #7
    End Of Line Hammer's Avatar
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    Please don't cross post
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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