Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

RedHat 9 (Linux i386) - man page for lock (redhat section 2)

UNIMPLEMENTED(2)					     Linux Programmer's Manual						  UNIMPLEMENTED(2)

NAME
afs_syscall, break, ftime, gtty, lock, mpx, phys, prof, profil, stty, ulimit - unimplemented system calls
SYNOPSIS
Unimplemented system calls.
DESCRIPTION
These system calls are not implemented in the Linux 2.0 kernel.
RETURN VALUE
These system calls always return -1 and set errno to ENOSYS.
NOTES
Note that ftime(3), profil(3) and ulimit(3) are implemented as library functions. Some system calls, like ioperm(2), iopl(2), ptrace(2) and vm86(2) only exist on certain architectures. Some system calls, like ipc(2) and {create,init,delete}_module(2) only exist when the Linux kernel was built with support for them.
SEE ALSO
obsolete(2) Linux 2.0 1998-06-12 UNIMPLEMENTED(2)