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    Command:

    sockatmark

    
    
    

    SYNOPSIS

           #include <sys/socket.h>
    
           int sockatmark(int sockfd);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           sockatmark(): _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
    
    
    

    DESCRIPTION

           sockatmark()  returns  a  value  indicating  whether  or not the socket
           referred to by the file descriptor sockfd is at the  out-of-band  mark.
           If  the socket is at the mark, then 1 is returned; if the socket is not
           at the mark, 0 is returned.  This function does not remove the  out-of-
           band mark.
    
    
    

    RETURN VALUE

           A  successful  call  to  sockatmark() returns 1 if the socket is at the
           out-of-band mark, or 0 if it is not.  On  error,  -1  is  returned  and
           errno is set to indicate the error.
    
    
    

    ERRORS

           EBADF  sockfd is not a valid file descriptor.
    
           EINVAL sockfd  is  not  a  file descriptor to which sockatmark() can be
                  applied.
    
    
    

    VERSIONS

           sockatmark() was added to glibc in version 2.2.4.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The sockatmark() function is thread-safe.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    NOTES

           If sockatmark() returns 1, then the out-of-band data can be read  using
           the MSG_OOB flag of recv(2).
    
           Out-of-band data is supported only on some stream socket protocols.
    
           sockatmark() can safely be called from a handler for the SIGURG signal.
    
           sockatmark() is implemented using the SIOCATMARK ioctl(2) operation.
    
    
    

    BUGS

           Prior to glibc 2.4, sockatmark() did not work.
    
    
    

    EXAMPLE

           The following code can be used after receipt of a SIGURG signal to read
                   if (atmark)
                       break;
    
                   s = read(sockfd, buf, BUF_LEN) <= 0);
                   if (s == -1)
                       perror("read");
                   if (s <= 0)
                       break;
               }
    
               if (atmark == 1) {
                   if (recv(sockfd, &oobdata, 1, MSG_OOB) == -1) {
                       perror("recv");
                       ...
                   }
               }
    
    
    

    SEE ALSO

           fcntl(2), recv(2), send(2), tcp(7)
    
    
    

    Linux 2014-02-28 SOCKATMARK(3)

    
    
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