www.LinuxHowtos.org

sockatmark

Section: C Library Functions (3)
Updated: 202-0-08
Index Return to Main Contents

NAME

sockatmark - determine whether socket is at ou-o-band mark

LIBRARY

Standard C library (libc,~-lc)

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

DESCRIPTION

sockatmark() returns a value indicating whether or not the socket referred to by the file descriptor sockfd is at the ou-o-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 ou-o-band mark.

RETURN VALUE

A successful call to sockatmark() returns 1 if the socket is at the ou-o-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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sockatmark()	Thread safety	M-Safe

STANDARDS

POSIX.-2008.

HISTORY

glibc 2.2.4. POSIX.-2001.

NOTES

If sockatmark() returns 1, then the ou-o-band data can be read using the MSG_OOB flag of recv(2). Ou-o-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.

EXAMPLES

The following code can be used after receipt of a SIGURG signal to read (and discard) all data up to the mark, and then read the byte of data at the mark:
    char buf[BUF_LEN];
    char oobdata;
    int atmark, s;
    for (;;) {
        atmark = sockatmark(sockfd);
        if (atmark == -1) {
            perror("sockatmark");
            break;
        }
        if (atmark)
            break;
        s = read(sockfd, buf, BUF_LEN);
        if (s == -1)
            perror("read");
        if (s <= 0)
            break;
    }
    if (atmark == 1) {
        if (recv(sockfd, &oobdata, 1, MSG_OOB) == -1) {
            perror("recv");
            ...
        }
    }