ctype.h: Tweak comment

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
LT.old: Make __errno_location/__h_errno_location thread safe

WHY: errno in uClibc is not thread safe

HOW: __errno_location and it's sibling __h_errno_location need to be called
     via PLT - even from within libc. That way when linked with pthread,
     intra-uClibc callers will also use the thread safe version.

     This is achieved by removing the GI alias for these functions,
     ensuring that they get called normally (via PLT)

Verified with ARC LT.old and ARM cubieboard2 buildroot (LT.old)
NPTL is unaffected by this bug.

------------ History behind this patch ---------------------

This is a long standing bug (https://bugs.busybox.net/show_bug.cgi?id=2089)

Others have tried to fix it in past (alteast Peter Korsgaard's patch in 2010),
but somehow failed to be merged (or were backed out afterwards).
http://lists.uclibc.org/pipermail/uclibc/2010-July/044176.html

One of the causes could be side effect of atleast one more bug related to
pthreads and static link which has now been fixed.
http://lists.uclibc.org/pipermail/uclibc/2013-October/047958.html

I have solved this w/o looking at other pacthes but would like to give
credit to Peter and others for confirming that it makes sense.

Cc: Christian Ruppert <christian.ruppert@abilis.com>
CC: Francois Bedard <Francois.Bedard@synopsys.com>
Cc: Joern Rennecke  <joern.rennecke@embecosm.com>
Cc: Jeremy Bennett <jeremy.bennett@embecosm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: buildroot@busybox.net
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
weak symbols need to be "defined" weak but "declared" strong

Patch "LT.old: Make __errno_location/__h_errno_location thread safe"
uncovered yet another bug with static linking and errno (hopefully this
is last of them all).

Currently, __errno_location is declared weak but is defined strong.
While this provides with the desired weak semantics in dso, it
is subtly broken in static links.

Quoting Joern Rennecke (ARC gcc expert):

| I think the issue is that you declare the function as weak in the
| header file.  That is a rare instance where you want the reference
| use declaration that differs a bit from the definition.
| If the reference uses a weakly declared function, that creates a
| weakref, i.e. the linker won't bother to look for this symbol at
|  all - if it gets linked in for some other reason, fine,
| otherwise, it stays zero.

So the solution to declare strong, define weak.

Supporting data
-----------------
orig code: ARM mmap wrapper (LT.old build + my prev patch for errno)

_mmap:
    @ args = 8, pretend = 0, frame = 0
    @ frame_needed = 0, uses_anonymous_args = 0
    stmfd    sp!, {r4, r5, r7, lr}
    ldr    r5, [sp, #20]
    movs    ip, r5, asl #20
    beq    .L2
    bl    __errno_location(PLT)
    mov    r3, #22
    str    r3, [r0, #0]
    mvn    r0, #0
...
...
   .weak	__errno_location

A statically linked hello world program which uses mmap too.
As we can see__errno_location is completely gone - which is
semantically wrong - we need functional errno.

00008274 <__GI_mmap>:
    8274:    e92d40b0     push    {r4, r5, r7, lr}
    8278:    e59d5014     ldr    r5, [sp, #20]
    827c:    e1b0ca05     lsls    ip, r5, #20
    8280:    0a000004     beq    8298
    8284:    e320f000     nop    {0}
		          ^^^^^^^^^^
    8288:    e3a03016     mov    r3, #22
    828c:    e5803000     str    r3, [r0]
    8290:    e3e00000     mvn    r0, #0

This in turn is due to a fixup in ARM ld which transforms branch-to-null
into a nop. It is better than crashing but still wrong since errno
handling is removed.

With the patch, errno_location is restored back in test program.

00008274 <__GI_mmap>:
    8274:	e92d40b0 	push	{r4, r5, r7, lr}
    8278:	e59d5014 	ldr	r5, [sp, #20]
    827c:	e1b0ca05 	lsls	ip, r5, #20
    8280:	0a000004 	beq	8298 <__GI_mmap+0x24>
    8284:	eb000010 	bl	82cc <__errno_location>
    8288:	e3a03016 	mov	r3, #22
    828c:	e5803000 	str	r3, [r0]

Cc: Christian Ruppert <christian.ruppert@abilis.com>
CC: Francois Bedard <Francois.Bedard@synopsys.com>
Cc: Anton Kolesov <Anton.Kolesov@synopsys.com>
Cc: Joern Rennecke  <joern.rennecke@embecosm.com>
Cc: Jeremy Bennett <jeremy.bennett@embecosm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso: Fix misplaced declaration

Apparently i made a typo when applying
278a06d7abcc8774ba9bb9c15779749c7e2d68cd
sorry..

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso/mips: actually print results of each relocation

The patched line was outside of the body of the loop over relocations
and so would only print the results of the last relocation, fix that.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso/mips: Remove redundant LD_DEBUG prints

These should have been protected by

  if (_dl_debug_reloc && _dl_debug_detail)

, but since the previous change "ldso/mips: actually print results of
each relocation" makes this redundant, just eliminate these prints
instead.  I think this is the only item that is still printing
regardless of the value of LD_DEBUG when uClibc is built with
SUPPORT_LD_DEBUG=y.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
ldso: Add remaining relocation types to the table

The table format is thrown off a bit because some of these names are
too long to fit the previous format so they were put on their own
lines.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
test/math: Adjust arm tests for older ULPs format

The ULPs format in glibc has changed slightly and now deviates from
that in uClibc, so when using the files directly from glibc, for
certain types of tests the ULPs values were incorrectly defaulting to
0 rather than using the values provided.  This caused some tests to
fail despite the max ULPs being correctly marked.

Regenerated and updated part of the ULPs file to fix this issue.  This
also added values for exp and log.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
resolv: try next server on SERVFAIL

Commit e1420eca7374cd8f583e9d774c890645a205aaee fixed a bug where a
response code should mean the next server is tried. However, it tries
only the next search domain, and never skips to the next server. This
fix makes sure we try the next server on SERVFAIL.

Signed-off-by: Michel Stam <michel@reverze.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>