setjmp.3: ffix

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

man3/setjmp.3

@@ -25,21 +25,21 @@
 .SH NAME
 setjmp, sigsetjmp, longjmp, siglongjmp  \- performing a nonlocal goto
 .SH SYNOPSIS
-.B #include <setjmp.h>
-.sp
 .nf
+.B #include <setjmp.h>
+.PP
 .BI "int setjmp(jmp_buf " env );
 .BI "int sigsetjmp(sigjmp_buf " env ", int " savesigs );
-
+.PP
 .BI "void longjmp(jmp_buf " env ", int " val );
 .BI "void siglongjmp(sigjmp_buf " env ", int " val );
 .fi
-.sp
+.PP
 .in -4n
 Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
 .in
-.sp
+.PP
 .BR setjmp ():
 see NOTES.
 .br
@@ -55,7 +55,7 @@ function dynamically establishes the target to which control
 will later be transferred, and
 .BR longjmp ()
 performs the transfer of execution.
-
+.PP
 The
 .BR setjmp ()
 function saves various information about the calling environment
@@ -68,7 +68,7 @@ for later use by
 In this case,
 .BR setjmp ()
 returns 0.
-
+.PP
 The
 .BR longjmp ()
 function uses the information saved in
@@ -83,7 +83,7 @@ the values of some other registers and the process signal mask
 may be restored to their state at the time of the
 .BR setjmp ()
 call.
-
+.PP
 Following a successful
 .BR longjmp (),
 execution continues as if
@@ -96,14 +96,14 @@ call because the "fake" return returns the value provided in
 If the programmer mistakenly passes the value 0 in
 .IR val ,
 the "fake" return will instead return 1.
-
+.PP
 .SS sigsetjmp() and siglongjmp()
 .BR sigsetjmp ()
 and
 .BR siglongjmp ()
 also perform nonlocal gotos, but provide predictable handling of
 the process signal mask.
-
+.PP
 If, and only if, the
 .I savesigs
 argument provided to
@@ -126,7 +126,7 @@ or
 the nonzero value specified in
 .I val
 is returned.
-
+.PP
 The
 .BR longjmp ()
 or
@@ -149,12 +149,12 @@ T{
 .BR siglongjmp ()
 T}	Thread safety	MT-Safe
 .TE
-
+.PP
 .SH CONFORMING TO
 .BR setjmp (),
 .BR longjmp ():
 POSIX.1-2001, POSIX.1-2008, C89, C99.
-
+.PP
 .BR sigsetjmp (),
 .BR siglongjmp ():
 POSIX.1-2001, POSIX.1-2008.
@@ -198,7 +198,7 @@ with calls to
 with a nonzero
 .I savesigs
 argument.
-
+.PP
 .BR setjmp ()
 and
 .BR longjmp ()
@@ -213,7 +213,7 @@ if you want to portably save and restore signal masks, use
 and
 .BR siglongjmp ().
 See also the discussion of program readability below.
-
+.PP
 The compiler may optimize variables into registers, and
 .BR longjmp ()
 may restore the values of other registers in addition to the
@@ -259,13 +259,13 @@ call.
 call should employ a unique
 .IR jmp_buf
 variable.)
-
+.PP
 Adding further difficulty, the
 .BR setjmp ()
 and
 .BR longjmp ()
 calls may not even be in the same source code module.
-
+.PP
 In summary, nonlocal gotos can make programs harder to understand
 and maintain, and an alternative should be used if possible.
 .\"
@@ -276,7 +276,7 @@ returns before
 .BR longjmp ()
 is called, the behavior is undefined.
 Some kind of subtle or unsubtle chaos is sure to result.
-
+.PP
 If, in a multithreaded program, a
 .BR longjmp ()
 call employs an
@@ -294,7 +294,7 @@ in a different thread, the behavior is undefined.
 .\"     (i.e., from a handler that was invoked in response to a signal that was
 .\"     generated while another signal was already in the process of being
 .\"     handled), the behavior is undefined.
-
+.PP
 POSIX.1-2008 Technical Corrigendum 2 adds
 .\" http://austingroupbugs.net/view.php?id=516#c1195
 .BR longjmp ()