.BR flock (2),
possibly implemented in terms of
.BR fcntl (2),
-appears on most Unices.
+appears on most Unix systems.
.SH NOTES
.BR flock (2)
does not lock files over NFS. Use
.\" License.
.\" Modified Sat Jul 24 21:27:01 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified 14 Jun 2002, Michael Kerrisk <mtk-manpages@gmx.net>
-.\" Added notes on differences from other Unices with respect to
+.\" Added notes on differences from other Unix systems with respect to
.\" waited-for children.
.TH CLOCK 3 2002-06-14 "GNU" "Linux Programmer's Manual"
.SH NAME
and
.B O_TRUNC
unspecified. On Linux, this will successfully truncate an existing
-shared memory object \(em this may not be so on other Unices.
+shared memory object \(em this may not be so on other Unix systems.
.LP
The POSIX shared memory object implementation on Linux 2.4 makes use
of a dedicated file system, which is normally
.TP
Note:
The following description applies to System V release 4 based system, which
-currently covers most commercial Unices (Solaris, HP-UX, Irix, Tru64)
+currently covers most commercial Unix systems (Solaris, HP-UX, Irix, Tru64)
as well as the major Linux distributions (RedHat, Debian, Mandrake,
Suse, Caldera). Some systems (Slackware Linux, FreeBSD, OpenBSD)
have a somewhat different scheme of boot scripts.
directory (\fI/etc/sysconfig\fR on RedHat systems) and are
used by the boot scripts.
-In older Unices, these files contained the actual command line
+In older Unix systems, these files contained the actual command line
options for the daemons, but in modern Linux systems (and also
in HP-UX), these files just contain shell variables. The boot
scripts in \fI/etc/init.d\fR \fBsource\fR the configuration
and (on architectures other than SPARC and MIPS)
.B SIGBUS
was to terminate the process (without a core dump).
-(On some other Unices the default action for
+(On some other Unix systems the default action for
.BR SIGXCPU " and " SIGXFSZ
is to terminate the process without a core dump.)
Linux 2.4 conforms to the POSIX.1-2001 requirements for these signals,
.B SIGEMT
is not specified in POSIX.1-2001, but nevertheless appears
-on most other Unices, where its default action is typically to terminate
+on most other Unix systems,
+where its default action is typically to terminate
the process with a core dump.
.B SIGPWR
(which is not specified in POSIX.1-2001) is typically ignored
-by default on those other Unices where it appears.
+by default on those other Unix systems where it appears.
.B SIGIO
(which is not specified in POSIX.1-2001) is ignored by default
-on several other Unices.
+on several other Unix systems.
.SS "Real-time Signals"
Linux supports real-time signals as originally defined in the POSIX.1b
real-time extensions (and now included in POSIX.1-2001).
.RB ( SIGRTMAX ).
(Programs should always refer to real-time signals using notation
.BR SIGRTMIN +n,
-since the range of real-time signal numbers varies across Unices.)
+since the range of real-time signal numbers varies across Unix systems.)
.PP
Unlike standard signals, real-time signals have no predefined meanings:
the entire set of real-time signals can be used for application-defined