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SOCKATMARK(3) FreeBSD Library Functions Manual SOCKATMARK(3) NAME sockatmark - determine whether a socket is at the out-of-band mark LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/socket.h> int sockatmark(int s); DESCRIPTION The sockatmark function determines whether the socket referenced by the file descriptor s is at the out-of-band mark. RETURN VALUES 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. ERRORS 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. SEE ALSO ioctl(2), recv(2), socket(2) Stuart Sechrest, An Introductory 4.4BSD Interprocess Communication Tutorial. (see /usr/share/doc/reference/ref3/sockets) 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/reference/ref3/sockets-advanced) STANDARDS The sockatmark function conforms to IEEE Std 1003.1-2001 ("POSIX.1"). HISTORY The sockatmark function appeared in IEEE Std 1003.1g-2000 ("POSIX.1g") as a replacement for the SIOCATMARK ioctl(2) interface. FreeBSD 14.1-RELEASE-p8 June 28, 2022 FreeBSD 14.1-RELEASE-p8