signalfd.2: ffix

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

man2/signalfd.2

@@ -22,7 +22,7 @@
 signalfd \- create a file descriptor for accepting signals
 .SH SYNOPSIS
 .B #include <sys/signalfd.h>
-.sp
+.PP
 .BI "int signalfd(int " fd ", const sigset_t *" mask ", int " flags );
 .SH DESCRIPTION
 .BR signalfd ()
@@ -35,7 +35,7 @@ and has the advantage that the file descriptor may be monitored by
 .BR poll (2),
 and
 .BR epoll (7).
-
+.PP
 The
 .I mask
 argument specifies the set of signals that the caller
@@ -55,7 +55,7 @@ or
 signals via a signalfd file descriptor;
 these signals are silently ignored if specified in
 .IR mask .
-
+.PP
 If the
 .I fd
 argument is \-1,
@@ -69,7 +69,7 @@ is not \-1,
 then it must specify a valid existing signalfd file descriptor, and
 .I mask
 is used to replace the signal set associated with that file descriptor.
-
+.PP
 Starting with Linux 2.6.27, the following values may be bitwise ORed in
 .IR flags
 to change the behavior of
@@ -96,7 +96,7 @@ for reasons why this may be useful.
 In Linux up to version 2.6.26, the
 .I flags
 argument is unused, and must be specified as zero.
-
+.PP
 .BR signalfd ()
 returns a file descriptor that supports the following operations:
 .TP
@@ -168,9 +168,9 @@ The format of the
 structure(s) returned by
 .BR read (2)s
 from a signalfd file descriptor is as follows:
+.PP
 .in +4n
-.nf
-
+.EX
 struct signalfd_siginfo {
     uint32_t ssi_signo;    /* Signal number */
     int32_t  ssi_errno;    /* Error number (unused) */
@@ -198,7 +198,7 @@ struct signalfd_siginfo {
                               additional fields in the future) */
 };
 
-.fi
+.EE
 .in
 Each of the fields in this structure
 is analogous to the similarly named field in the
@@ -334,7 +334,7 @@ If a signal appears in the
 .I mask
 of more than one of the file descriptors, then occurrences
 of that signal can be read (once) from any one of the file descriptors.
-
+.PP
 Attempts to include
 .B SIGKILL
 and
@@ -342,7 +342,7 @@ and
 in
 .I mask
 are silently ignored.
-
+.PP
 The signal mask employed by a signalfd file descriptor can be viewed
 via the entry for the corresponding file descriptor in the process's
 .IR /proc/[pid]/fdinfo
@@ -360,7 +360,7 @@ or the
 .BR SIGFPE
 signal that results from an arithmetic error.
 Such signals can be caught only via signal handler.
-
+.PP
 As described above,
 in normal usage one blocks the signals that will be accepted via
 .BR signalfd ().
@@ -391,7 +391,7 @@ The glibc
 .BR signalfd ()
 wrapper function does not include this argument,
 since it provides the required value for the underlying system call.
-
+.PP
 There are two underlying Linux system calls:
 .BR signalfd ()
 and the more recent
@@ -425,9 +425,9 @@ The program terminates after accepting a
 .B SIGQUIT
 signal.
 The following shell session demonstrates the use of the program:
+.PP
 .in +4n
-.nf
-
+.EX
 .RB "$" " ./signalfd_demo"
 .BR "^C" "                   # Control\-C generates SIGINT"
 Got SIGINT
@@ -436,11 +436,11 @@ Got SIGINT
 \fB^\\\fP                    # Control\-\\ generates SIGQUIT
 Got SIGQUIT
 $
-.fi
+.EE
 .in
 .SS Program source
 \&
-.nf
+.EX
 #include <sys/signalfd.h>
 #include <signal.h>
 #include <unistd.h>
@@ -487,7 +487,7 @@ main(int argc, char *argv[])
         }
     }
 }
-.fi
+.EE
 .SH SEE ALSO
 .BR eventfd (2),
 .BR poll (2),