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    The following form allows you to view linux man pages.

    Command:

    ipq_read

    
    
    
    

    SYNOPSIS

           #include <linux/netfilter.h>
           #include <libipq.h>
    
           ssize_t ipq_read(const struct ipq_handle *h, unsigned char *buf, size_t
           len, int timeout);
    
    
    

    DESCRIPTION

           The  ipq_read function reads a queue message from the kernel and copies
           it to the memory pointed to by buf to a maximum length of len.
    
           The h parameter is a context handle which  must  previously  have  been
           returned successfully from a call to ipq_create_handle.
    
           The  caller  is  responsible for ensuring that the memory pointed to by
           buf is large enough to contain len bytes.
    
           The timeout parameter may be used to set a timeout for  the  operation,
           specified  in  microseconds.   This  is  implemented  internally by the
           library via the select system call.  A value of zero  provides  normal,
           backwards-compatible  blocking  behaviour  with no timeout.  A negative
           value causes the function to return immediately.
    
           Data returned via  buf  should  not  be  accessed  directly.   Use  the
           ipq_message_type,   ipq_get_packet,  and  ipq_get_msgerr  functions  to
           access the queue message in the buffer.
    
    
    

    RETURN VALUE

           On failure, -1 is returned.
           On success, a non-zero positive value is returned when no timeout value
           is specified.
           On  success with a timeout value specified, zero is returned if no data
           was available to read, or if a non-blocked signal was caught.   In  the
           latter case, the global errno value will be set to EINTR.
    
    
    

    ERRORS

           On  error,  a  descriptive  error  message  will  be  available via the
           ipq_errstr function.
    
    
    

    DIAGNOSTICS

           While the ipq_read function may return successfully, the queue  message
           copied to the buffer may itself be an error message from a higher level
           kernel component.  Use ipq_message_type to determine if it is an  error
           message, and ipq_get_msgerr to access the value of the message.
    
    
    

    BUGS

           None known.
    
    
    

    AUTHOR

           James Morris <jmorris@intercode.com.au>
    
    
    
    

    Linux iptables 1.2 16 October 2001 IPQ_READ(3)

    
    
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