posix_spawn.3: Tweak a few more details

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

man3/posix_spawn.3

@@ -224,7 +224,7 @@ process can accomplish before it executes the executable file.
 These operations are controlled by the attributes object pointed to by
 .IR attrp
 and the file actions object pointed to by
-.I file_actions.
+.IR file_actions .
 In the child, processing is done in the following sequence:
 .IP 1. 3
 Process attribute actions: signal mask, signal default handlers,
@@ -273,8 +273,10 @@ are as follows:
 .B POSIX_SPAWN_SETSIGMASK
 Set the signal mask to the signal set specified in the
 .I spawn-sigmask
-attribute (see
-.BR posix_spawnattr_setsigmask (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setsigmask (3))
 of the object pointed to by
 .IR attrp .
 If the
@@ -284,8 +286,10 @@ flag is not set, then the child inherits the parent's signal mask.
 .B POSIX_SPAWN_SETSIGDEF
 Reset the disposition of all signals in the set specified in the
 .I spawn-sigdefault
-attribute (see
-.BR posix_spawnattr_setsigdefault (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setsigdefault (3))
 of the object pointed to by
 .IR attrp
 to the default.
@@ -303,8 +307,10 @@ If this flag is set, and the
 flag is not set, then set the scheduling parameters
 to the parameters specified in the
 .I spawn-schedparam
-attribute (see
-.BR posix_spawnattr_setschedparam (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setschedparam (3))
 of the object pointed to by
 .IR attrp .
 .TP
@@ -315,29 +321,22 @@ as follows:
 .IP * 3
 The scheduling policy is set to the value specified in the
 .I spawn-schedpolicy
-attribute (see
-.BR posix_spawnattr_setpolicy (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setpolicy (3))
 of the object pointed to by
 .IR attrp .
-.\" The following looks like a glibc bug, since POSIX says
-.\" POSIX_SPAWN_SETSCHEDPARAM is ignored when POSIX_SPAWN_SETSCHEDULER
-.\" is specified
-.\" I filed http://sourceware.org/bugzilla/show_bug.cgi?id=12052
-.\" Depending on the outcome, the following section may need to be
-.\" rewritten and a description of the current behavior added under BUGS.
 .IP *
-If the
-.B POSIX_SPAWN_SETSCHEDPARAM
-flag is also set,
-then the scheduling parameters are set to the value specified in the
+The scheduling parameters are set to the value specified in the
 .I spawn-schedparam
-attribute (see
-.BR posix_spawnattr_setschedparam (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setschedparam (3))
 of the object pointed to by
-.IR attrp .
-If the
-.B POSIX_SPAWN_SETSCHEDPARAM
-flag is not set, then the housekeeping in the child fails.
+.IR attrp
+(but see BUGS).
 .LP
 If the
 .B POSIX_SPAWN_SETSCHEDPARAM
@@ -345,17 +344,6 @@ and
 .B POSIX_SPAWN_SETSCHEDPOLICY
 flags are not specified,
 the child inherits the corresponding scheduling attributes from the parent.
-.\" Given a NULL 'param' argument, sched_setscheduler() fails with EINVAL.
-.\"
-.\" FIXME: The following seems to be misleading
-.\" (If
-.\" .I POSIX_SPAWN_SETSCHEDPARAM
-.\" is also set,
-.\" then the scheduling parameters are set according to the corresponding element;
-.\" otherwise, the effect is as if a NULL was passed as the
-.\" .I param
-.\" argument to
-.\" .BR sched_setscheduler (2)).
 .RE
 .TP
 .B POSIX_SPAWN_RESETIDS
@@ -372,8 +360,10 @@ the setting of the effective UID and GID (se
 .B POSIX_SPAWN_SETPGROUP
 Set the process group to the value specified in the
 .I spawn-pgroup
-attribute (see
-.BR posix_spawnattr_setpgroup (3))
+attribute
+.\" FIXME .
+.\" (see
+.\" .BR posix_spawnattr_setpgroup (3))
 of the object pointed to by
 .IR attrp .
 If the
@@ -429,7 +419,7 @@ and
 .BR posix_spawn_file_actions_adddup2 (3).
 The requested operations are performed in the order they were added to
 .IR file_actions .
-.\" FIXME I think the following is best placed in the
+.\" FIXME . I think the following is best placed in the
 .\" posix_spawn_file_actions_adddup2(3) page, and a similar statement is
 .\" also needed in posix_spawn_file_actions_addclose(3)
 .\" Note that you can specify file descriptors in
@@ -541,7 +531,6 @@ argument as one of the files in the caller's
 .IR /proc/self/fd
 directory.
 .SH VERSIONS
-.\" FIXME all of these pages should have a VERSIONS section
 The
 .BR posix_spawn ()
 and
@@ -550,13 +539,28 @@ functions are available since glibc 2.2.
 .SH CONFORMING TO
 .LP
 POSIX.1-2001, POSIX.1-2008.
-.\" FIXME: This piece belongs in pthread_attr_setflags()
-The
-.B POSIX_SPAWN_USEVFORK
-flag is a GNU extension; the
-.B _GNU_SOURCE
-feature test macro must be defined (before including any header files)
-to obtain the definition of this constant.
+.\" FIXME . This piece belongs in spawnattr_setflags(3)
+.\" The
+.\" .B POSIX_SPAWN_USEVFORK
+.\" flag is a GNU extension; the
+.\" .B _GNU_SOURCE
+.\" feature test macro must be defined (before including any header files)
+.\" to obtain the definition of this constant.
+.SH BUGS
+POSIX.1 says that when
+.B POSIX_SPAWN_SETSCHEDULER
+is specified in
+.IR spawn-flags ,
+then the
+.B POSIX_SPAWN_SETSCHEDPARAM
+(if present) is ignored.
+However, before glibc 2.14, calls to
+.BR posix_spawn ()
+failed with an error if
+.\" http://sourceware.org/bugzilla/show_bug.cgi?id=12052
+.BR POSIX_SPAWN_SETSCHEDULER
+was specified without also specifying
+.BR POSIX_SPAWN_SETSCHEDPARAM .
 .SH EXAMPLE
 The program below demonstrates the use of various functions in the
 POSIX spawn API.