.IP *
Btrfs (since Linux 3.7)
.IP *
-.BR tmpfs "(5) (since Linux 3.5)"
+.BR tmpfs (5)
+(since Linux 3.5)"
.\" commit 83e4fa9c16e4af7122e31be3eca5d57881d236fe
.SS Collapsing file space
.\" commit 00f5e61998dd17f5375d9dfc01331f104b83f841
wrapper functions transparently deal with the variations across kernel versions.
.PP
On Alpha, instead of a pair of
-.BR getgid "() and " getegid ()
+.BR getgid ()
+and
+.BR getegid ()
system calls, a single
.BR getxgid ()
system call is provided, which returns a pair of real and effective GIDs.
.\" Review progress of https://bugzilla.redhat.com/show_bug.cgi?id=1469757
.PP
On Alpha, instead of a pair of
-.BR getpid "() and " getppid ()
+.BR getpid ()
+and
+.BR getppid ()
system calls, a single
.BR getxpid ()
system call is provided, which returns a pair of PID and parent PID.
wrapper functions transparently deal with the variations across kernel versions.
.PP
On Alpha, instead of a pair of
-.BR getuid "() and " geteuid ()
+.BR getuid ()
+and
+.BR geteuid ()
system calls, a single
.BR getxuid ()
system call is provided, which returns a pair of real and effective UIDs.
.IP *
ext4 (since Linux 3.8)
.IP *
-.BR tmpfs "(5) (since Linux 3.8)"
+.BR tmpfs (5)
+(since Linux 3.8)
.IP *
NFS (since Linux 3.18)
.\" commit 1c6dcbe5ceff81c2cf8d929646af675cd59fe7c0
.BR get_thread_area ()
first appeared in Linux 2.5.32.
.SH CONFORMING TO
-.BR set_thread_area "() and " get_thread_area ()
+.BR set_thread_area ()
+and
+.BR get_thread_area ()
are Linux-specific and should not be used in programs that are intended
to be portable.
.SH NOTES
.B TZ
variable does not appear in the environment, the system timezone is used.
The system timezone is configured by copying, or linking, a file in the
-.BR tzfile "(5) format to"
+.BR tzfile (5)
+format to
.IR /etc/localtime .
A timezone database of these files may be located in the system
timezone directory (see the \fBFILES\fP section below).
When a TZ string includes a dst timezone without anything following it,
then this file is used for the start/end rules.
It is in the
-.BR tzfile "(5) format."
+.BR tzfile (5)
+format.
By default, the zoneinfo Makefile hard links it to the
.IR America/New_York " tzfile."
.PP