lkml.org 
[lkml]   [1999]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC] Subtle race in dup2() and permissions on /proc/<pid>/fd/<n>
    viro asks:

    > dup2(foo, bar) closes bar, but completely ignores the results of
    > close(). POSIX position on that?

    The call
    fd = dup2(fd1,fd2);
    is equivalent to
    close(fd2);
    fd = fcntl(fd1, F_DUPFD, fd2);
    except that
    - if fd1==fd2 and both are valid, then dup2() returns this
    without closing fd2
    - if fd1 is invalid, dup2 returns -1 without closing fd2

    So, yes, it looks like there is no provision for returning
    close() errors here.


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.rutgers.edu
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:52    [W:2.404 / U:0.160 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site