chroot.2, clone.2, epoll_wait.2, execve.2, getgroups.2: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/chroot.2

@@ -104,10 +104,12 @@ so that after the call \(aq\fI.\fP\(aq can
 be outside the tree rooted at \(aq\fI/\fP\(aq.
 In particular, the superuser can escape from a "chroot jail"
 by doing:
-.nf
+.PP
-
+.in +4n
-    mkdir foo; chroot foo; cd ..
+.EX
-.fi
+mkdir foo; chroot foo; cd ..
+.EE
+.in
 .PP
 This call does not close open file descriptors, and such file
 descriptors may allow access to files outside the chroot tree.

man2/clone.2

@@ -1214,13 +1214,15 @@ argument includes
 .BR CLONE_VM .)
 To get the truth, it was sometimes necessary to use code such as the following:
 .PP
-.nf
+.in +4n
-    #include <syscall.h>
+.EX
+#include <syscall.h>
 
-    pid_t mypid;
+pid_t mypid;
 
-    mypid = syscall(SYS_getpid);
+mypid = syscall(SYS_getpid);
-.fi
+.EE
+.in
 .\" See also the following bug reports
 .\" https://bugzilla.redhat.com/show_bug.cgi?id=417521
 .\" http://sourceware.org/bugzilla/show_bug.cgi?id=6910

man2/epoll_wait.2

@@ -129,22 +129,26 @@ becomes ready or until a signal is caught.
 The following
 .BR epoll_pwait ()
 call:
-.nf
+.PP
-
+.in +4n
-    ready = epoll_pwait(epfd, &events, maxevents, timeout, &sigmask);
+.EX
-
+ready = epoll_pwait(epfd, &events, maxevents, timeout, &sigmask);
-.fi
+.EE
+.in
+.PP
 is equivalent to
 .I atomically
 executing the following calls:
-.nf
+.PP
+.in +4n
+.EX
+sigset_t origmask;
 
-    sigset_t origmask;
+pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
-
+ready = epoll_wait(epfd, &events, maxevents, timeout);
-    pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
+pthread_sigmask(SIG_SETMASK, &origmask, NULL);
-    ready = epoll_wait(epfd, &events, maxevents, timeout);
+.EE
-    pthread_sigmask(SIG_SETMASK, &origmask, NULL);
+.in
-.fi
 .PP
 The
 .I sigmask

man2/execve.2

@@ -721,7 +721,7 @@ The following program is designed to be execed by the second program below.
 It just echoes its command-line arguments, one per line.
 .PP
 .in +4n
-.nf
+.EX
 /* myecho.c */
 
 #include <stdio.h>
@@ -737,14 +737,14 @@ main(int argc, char *argv[])
 
     exit(EXIT_SUCCESS);
 }
-.fi
+.EE
 .in
 .PP
 This program can be used to exec the program named in its command-line
 argument:
+.PP
 .in +4n
-.nf
+.EX
-
 /* execve.c */
 
 #include <stdio.h>
@@ -768,20 +768,20 @@ main(int argc, char *argv[])
     perror("execve");   /* execve() returns only on error */
     exit(EXIT_FAILURE);
 }
-.fi
+.EE
 .in
 .PP
 We can use the second program to exec the first as follows:
 .PP
 .in +4n
-.nf
+.EX
 .RB "$" " cc myecho.c \-o myecho"
 .RB "$" " cc execve.c \-o execve"
 .RB "$" " ./execve ./myecho"
 argv[0]: ./myecho
 argv[1]: hello
 argv[2]: world
-.fi
+.EE
 .in
 .PP
 We can also use these programs to demonstrate the use of a script
@@ -791,25 +791,25 @@ To do this we create a script whose "interpreter" is our
 program:
 .PP
 .in +4n
-.nf
+.EX
 .RB "$" " cat > script"
 .B #!./myecho script-arg
 .B ^D
 .RB "$" " chmod +x script"
-.fi
+.EE
 .in
 .PP
 We can then use our program to exec the script:
 .PP
 .in +4n
-.nf
+.EX
 .RB "$" " ./execve ./script"
 argv[0]: ./myecho
 argv[1]: script-arg
 argv[2]: ./script
 argv[3]: hello
 argv[4]: world
-.fi
+.EE
 .in
 .SH SEE ALSO
 .BR chmod (2),

man2/getgroups.2

@@ -169,12 +169,14 @@ is inherited from the parent process, and preserved across an
 .PP
 The maximum number of supplementary group IDs can be found at run time using
 .BR sysconf (3):
-.nf
+.PP
-
+.in +4n
-    long ngroups_max;
+.EX
-    ngroups_max = sysconf(_SC_NGROUPS_MAX);
+long ngroups_max;
-
+ngroups_max = sysconf(_SC_NGROUPS_MAX);
-.fi
+..EE
+.in
+.EE
 The maximum return value of
 .BR getgroups ()
 cannot be larger than one more than this value.