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-'\" t
-.\" Copyright (c) 2006, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sockatmark 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sockatmark \- determine whether socket is at out-of-band mark
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/socket.h>
-.P
-.BI "int sockatmark(int " sockfd );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR sockatmark ():
-.nf
-    _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-.BR sockatmark ()
-returns a value indicating whether or not the socket referred
-to by the file descriptor
-.I 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.
-.SH RETURN VALUE
-A successful call to
-.BR 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
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I sockfd
-is not a valid file descriptor.
-.TP
-.B EINVAL
-.\" POSIX.1 says ENOTTY for this case
-.I sockfd
-is not a file descriptor to which
-.BR sockatmark ()
-can be applied.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR sockatmark ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.2.4.
-POSIX.1-2001.
-.SH NOTES
-If
-.BR sockatmark ()
-returns 1, then the out-of-band data can be read using the
-.B MSG_OOB
-flag of
-.BR recv (2).
-.P
-Out-of-band data is supported only on some stream socket protocols.
-.P
-.BR sockatmark ()
-can safely be called from a handler for the
-.B SIGURG
-signal.
-.P
-.BR sockatmark ()
-is implemented using the
-.B SIOCATMARK
-.BR ioctl (2)
-operation.
-.SH BUGS
-Prior to glibc 2.4,
-.BR sockatmark ()
-did not work.
-.SH EXAMPLES
-The following code can be used after receipt of a
-.B SIGURG
-signal to read (and discard) all data up to the mark,
-and then read the byte of data at the mark:
-.P
-.EX
-    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");
-            ...
-        }
-    }
-.EE
-.SH SEE ALSO
-.BR fcntl (2),
-.BR recv (2),
-.BR send (2),
-.BR tcp (7)