uClibc-alpine/libc/stdlib, branch master

libc: fix signal handling in system()

2012-01-24T02:22:06+00:00

When built without NPTL support (or for a sparc target), the system()
function doesn't conform to its specification. Namely, it uses signal()
to install/save/restore signal handlers, which may break applications
using custom handlers installed with sigaction(). In addition, it resets
the SIGCHLD handler to SIG_DFL instead of blocking the signal, which may
result in "lost" signals if a custom handler was installed.

Fix system() by replacing uses of signal() with appropriate calls to
sigaction() and sigprocmask().

Signed-off-by: Richard Braun 
Signed-off-by: Mike Frysinger

libc: build abort with unwind-info for backtrace

2012-01-15T11:27:41+00:00

If backtrace support is turned on, build raise() and abort() with
unwind info (fixup 4c9b7f3c21ff21c199e54bfad2fdf3445fa4573d).

Signed-off-by: Bernhard Reutner-Fischer

libc: allow to backtrace out of abort call

2012-01-13T11:22:59+00:00

Build raise and abort function with dwarf2 info by using
-fasynchronous-unwind-tables to make backtrace() working across a
call to abort.

A scenario where it could be useful is within a signal handler that
wants to dump a backtrace when catching some signal (i.e SIGABRT).
Without having abort & raise built with DWARF2 information, it is not
possible for the libgcc stack unwinder to walk through the call stack
out of the abort/raise function.

Impacts in terms of size are really limited

Current
   text    data     bss     dec     hex filename
    164       0       0     164      a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os
    164       0       0     164      a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS
    220      24       4     248      f8 ./libc/stdlib/abort.os

With (-fasynchronous-unwind-tables)

   text    data     bss     dec     hex filename
    216       0       0     216      d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os
    216       0       0     216      d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS
    280      24       4     308     134 ./libc/stdlib/abort.os

Signed-off-by: Carmelo Amoroso 
Acked-by: Bernhard Reutner-Fischer

stdlib: add qsort_r

2011-11-07T08:24:30+00:00

GNU extension like qsort but takes a 3 parameter comparision function.

Signed-off-by: Bernhard Reutner-Fischer

Defeat compiler optimization which assumes function addresses are never NULL

2011-09-15T14:59:21+00:00

From email:
A warning for people who can be hit by the same or similar issue:
gcc 4.1.2 with -march=i486 here with -Os and even with -O2 or -O
is "optimizing away" the check
       if (_stdio_term)
in libc/stdlib/_atexit.c
which results in a "call 0" and a segfault at exit
if you do not happen to link in stdio.

Signed-off-by: Denys Vlasenko

__uc_malloc: Fix memory-leak in error path

2011-05-10T18:09:36+00:00

Signed-off-by: Bernhard Reutner-Fischer

Fix malloc alignment

2011-04-11T11:26:56+00:00

In commit 3e0a1f388, Richard tried to fix malloc alignments by using
 alignof (double __attribute_aligned__(sizeof (size_t))).
This doesn't work, since attribute_aligned overrides the alignment
rather than providing a minimum. On C6X, malloc returns four-byte
aligned values rather than the necessary eight-byte alignment.

It's simpler to use a comparison and pick the bigger of the two values,
so that's what I've done.

Signed-off-by: Bernd Schmidt

memalign: include sys/param.h for MAX

2011-03-16T19:10:26+00:00

libc/stdlib/malloc/memalign.c:22:1: warning: "MAX" redefined In file included from
./libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h:25,
                 from ./include/bits/libc-lock.h:36,
                 from ./include/bits/stdio-lock.h:23,
                 from ./include/bits/uClibc_mutex.h:71,
                 from libc/stdlib/malloc/malloc.h:135,
                 from libc/stdlib/malloc/memalign.c:18:
./include/sys/param.h:75:1: warning: this is the location of the previous definition

Signed-off-by: Bernhard Reutner-Fischer

really fix missing __libc_drand48_data

2011-03-10T12:02:19+00:00

Signed-off-by: Peter S. Mazinger

Revert "missing prototype of __libc_drand48_data fixed"

2011-03-10T11:59:15+00:00

This reverts commit e2cea9b9edabe885b9bf2586f9541ffb8fe93f3f.

Signed-off-by: Peter S. Mazinger