[SPARC]: avoid CHILD_MAX and OPEN_MAX constants

I don't figure anyone really cares about SunOS syscall emulation, and I
certainly don't. But I'm getting rid of uses of the OPEN_MAX and CHILD_MAX
compile-time constant, and these are almost the only ones. OPEN_MAX is a
bogus constant with no meaning about anything. The RLIMIT_NOFILE resource
limit is what sysconf (_SC_OPEN_MAX) actually wants to return.

The CHILD_MAX cases weren't actually using anything I want to get rid of,
but I noticed that they are there and are wrong too. The CHILD_MAX value
is not really unlimited as a -1 return from sysconf indicates. The
RLIMIT_NPROC resource limit is what sysconf (_SC_CHILD_MAX) wants to return.

Signed-off-by: Roland McGrath <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/sparc/kernel/sys_sunos.c

···
 		ret = ARG_MAX;
 		break;
 	case _SC_CHILD_MAX:
-		ret = -1; /* no limit */
+		ret = current->signal->rlim[RLIMIT_NPROC].rlim_cur;
 		break;
 	case _SC_CLK_TCK:
 		ret = HZ;
···
 		ret = NGROUPS_MAX;
 		break;
 	case _SC_OPEN_MAX:
-		ret = OPEN_MAX;
+		ret = current->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 		break;
 	case _SC_JOB_CONTROL:
 		ret = 1;	/* yes, we do support job control */

arch/sparc64/kernel/sys_sunos32.c

···
 		ret = ARG_MAX;
 		break;
 	case _SC_CHILD_MAX:
-		ret = -1; /* no limit */
+		ret = current->signal->rlim[RLIMIT_NPROC].rlim_cur;
 		break;
 	case _SC_CLK_TCK:
 		ret = HZ;
···
 		ret = NGROUPS_MAX;
 		break;
 	case _SC_OPEN_MAX:
-		ret = OPEN_MAX;
+		ret = current->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 		break;
 	case _SC_JOB_CONTROL:
 		ret = 1;	/* yes, we do support job control */

arch/sparc64/solaris/misc.c

···
 {
 	switch (id) {
 	case SOLARIS_CONFIG_NGROUPS:	return NGROUPS_MAX;
-	case SOLARIS_CONFIG_CHILD_MAX:	return -1; /* no limit */
-	case SOLARIS_CONFIG_OPEN_FILES:	return OPEN_MAX;
+	case SOLARIS_CONFIG_CHILD_MAX:
+		return current->signal->rlim[RLIMIT_NPROC].rlim_cur;
+	case SOLARIS_CONFIG_OPEN_FILES:
+		return current->signal->rlim[RLIMIT_NOFILE].rlim_cur;
 	case SOLARIS_CONFIG_POSIX_VER:	return 199309;
 	case SOLARIS_CONFIG_PAGESIZE:	return PAGE_SIZE;
 	case SOLARIS_CONFIG_XOPEN_VER:	return 3;