sigaltstack.2: ffix

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

man2/sigaltstack.2

@@ -31,12 +31,12 @@ sigaltstack \- set and/or get signal stack context
 .B #include <signal.h>
 .sp
 .BI "int sigaltstack(const stack_t *" ss ", stack_t *" old_ss );
-.sp
+.PP
 .in -4n
 Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
 .in
-.sp
+.PP
 .BR sigaltstack ():
 .ad l
 .RS 4
@@ -57,7 +57,7 @@ An alternate signal stack is used during the
 execution of a signal handler if the establishment of that handler (see
 .BR sigaction (2))
 requested it.
-
+.PP
 The normal sequence of events for using an alternate signal stack
 is the following:
 .TP 3
@@ -85,7 +85,7 @@ established signal stack.
 If we are interested in performing just one
 of these tasks, then the other argument can be specified as NULL.
 Each of these arguments is a structure of the following type:
-.sp
+
 .in +4n
 .nf
 typedef struct {
@@ -104,16 +104,16 @@ The constant \fBSIGSTKSZ\fP is defined to be large enough
 to cover the usual size requirements for an alternate signal stack,
 and the constant \fBMINSIGSTKSZ\fP defines the minimum
 size required to execute a signal handler.
-
+.PP
 When a signal handler is invoked on the alternate stack,
 the kernel automatically aligns the address given in \fIss.ss_sp\fP
 to a suitable address boundary for the underlying hardware architecture.
-
+.PP
 To disable an existing stack, specify \fIss.ss_flags\fP
 as \fBSS_DISABLE\fP.
 In this case, the remaining fields
 in \fIss\fP are ignored.
-
+.PP
 If \fIold_ss\fP is not NULL, then it is used to return information about
 the alternate signal stack which was in effect prior to the
 call to
@@ -167,7 +167,6 @@ T{
 .BR sigaltstack ()
 T}	Thread safety	MT-Safe
 .TE
-
 .SH CONFORMING TO
 POSIX.1-2001, POSIX.1-2009, SUSv2, SVr4.
 .SH NOTES