SOCKATMARK(3) NetBSD Library Functions Manual SOCKATMARK(3)
sockatmark -- determine whether a socket is at the out-of-band mark
Standard C Library (libc, -lc)
#include <sys/socket.h> int sockatmark(int s);
The sockatmark function determines whether the socket referenced by the file descriptor s is at the out-of-band mark.
If successful, the sockatmark function returns 1 to indicate that the socket is at an out-of-band mark; 0 is returned if there is no out-of- band mark or the mark is preceded by in-band data. Otherwise, -1 is returned and errno is set to indicate the error.
The sockatmark function will fail if: [EBADF] The argument s is not a valid file descriptor. [ENOTTY] The file descriptor s does not refer to a socket.
ioctl(2), recv(2), socket(2) Stuart Sechrest, An Introductory 4.4BSD Interprocess Communication Tutorial. (see /usr/share/doc/psd/20.ipctut) Samuel J. Leffler, Robert S. Fabry, William N. Joy, Phil Lapsley, Steve Miller, and Chris Torek, Advanced 4.4BSD IPC Tutorial. (see /usr/share/doc/psd/21.ipc)
The sockatmark function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
The sockatmark function appeared in IEEE Std 1003.1g-2000 (``POSIX.1'') as a replacement for the SIOCATMARK ioctl(2) interface. NetBSD 8.1 May 15, 2003 NetBSD 8.1
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