Commit Graph

97 Commits

Author SHA1 Message Date
Pedro F. Giffuni
ee90489bc4 Make use of GCC alloc_align attribute
This lets the compiler know about the alignment of pointers returned
by aligned_alloc(3), posix_memalign(3). and contigmalloc(9)

Currently this is only supported in recent gcc but we are ready to
use it if clang implements it.

Relnotes:	yes
2015-05-15 20:43:37 +00:00
Pedro F. Giffuni
d0e9981e39 No need for result_use_check attribute in reallocf(3). 2015-05-01 20:40:48 +00:00
Baptiste Daroussin
8f0baadaa0 Move reallocarray definition to the _BSD_VISIBLE block
Add the required __alloc_size attributes

Requested by:	pfg
2015-05-01 19:14:32 +00:00
Baptiste Daroussin
450dfafb15 Import reallocarray(3) from OpenBSD
Add a manpage for it, assign the copyright to the OpenBSD project on it since it
is mostly copy/paste from OpenBSD manpage.
style(9) fixes

Differential Revision:	https://reviews.freebsd.org/D2420
Reviewed by:	kib
2015-05-01 18:32:16 +00:00
Pedro F. Giffuni
153cbcd657 Make use of gcc attributes in some standard include headers.
The `nonnull' attribute specifies that some function parameters should be
non-null pointers.  This is very useful as it helps the compiler generate
warnings on suspicious code and can also enable some small optimizations.

Also start using 'alloc_size' attribute in the allocator functions.

This is an initial step to better integrate our libc with the compiler:
these attributes are fully supported by clang and they are also useful
for the static analyzer.

Note that due to some bogus internal procedure in the way gcc ports
are built they may require updating if they were built before r280801.

Relnotes:		yes
Hinted by:		Android's bionic libc
Differential Revision:	https://reviews.freebsd.org/D2107
2015-04-06 01:39:16 +00:00
Pedro F. Giffuni
1693a59a64 Clean sparse spaces. 2015-03-25 16:54:37 +00:00
Pedro F. Giffuni
f4189cd649 Add bsearch_b to the libc map and the stdlib header.
bsearch_b is the Apple blocks enabled version of bsearch(3).
This was added to libc in Revision 264042 but the commit
missed the declaration required to make use of it.

While here move some other block-related functions to the
BSD_VISIBLE block as these are non-standard.

Phabric:	D638
Reviewed by:	theraven, wollman
2014-09-01 22:25:42 +00:00
David Chisnall
46cdc14062 Add support for some block functions that come from OS X. These are
intended to build with any C compiler.

Reviewed by:	pfg
MFC after:	3 weeks
2014-04-02 16:07:48 +00:00
Tijl Coosemans
0a4c54d606 Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4
-fms-extensions.

MFC after:	2 weeks
2014-04-01 14:46:11 +00:00
Jilles Tjoelker
65ba8dff5f Add mkostemp() and mkostemps().
These are like mkstemp() and mkstemps() but allow passing open(2) flags like
O_CLOEXEC.
2013-08-09 17:24:23 +00:00
Jilles Tjoelker
e45e1f2730 stdlib.h: Add correct POSIX version for POSIX extensions to C. 2013-07-05 14:16:04 +00:00
Andrey A. Chernov
476d9314d6 1) POSIX requires rand(3) return values to be in the [0, RAND_MAX] range,
but ACM formula we use have internal state (and return value) in the
[1, 0x7ffffffe] range, so our RAND_MAX (0x7fffffff) is never reached
because it is off by one, zero is not reached too.

Correct both RAND_MAX and rand(3) return value, shifting last one
to the 0 by 1 subtracted, resulting POSIXed [0, 0x7ffffffd(=new RAND_MAX)]
range.

2) Add a checks for not overflowing on too big seeds. It may happens on
the machines, where sizeof(unsigned int) > 32 bits.

Reviewed by:    bde [1]
MFC after:      2 weeks
2013-07-03 21:21:54 +00:00
Jason Evans
a4bd5210d5 Import jemalloc 9ef7f5dc34ff02f50d401e41c8d9a4a928e7c2aa (dev branch,
prior to 3.0.0 release) as contrib/jemalloc, and integrate it into libc.
The code being imported by this commit diverged from
lib/libc/stdlib/malloc.c in March 2010, which means that a portion of
the jemalloc 1.0.0 ChangeLog entries are relevant, as are the entries
for all subsequent releases.
2012-04-17 07:22:14 +00:00
David Chisnall
3ac9d65989 Correctly expose xlocale functions if people include the headers in the wrong
order (as some ports apparently do).

Approved by:	dim (mentor)
2012-03-28 12:11:54 +00:00
David Chisnall
79d09835dd Expose some C11 stuff that is also C++11 stuff in C++11 mode.
Approved by:	dim (mentor)
2012-03-14 14:39:07 +00:00
Ed Schouten
9e16bab42a Add aligned_alloc(3).
The C11 folks reinvented the wheel by introducing an aligned version of
malloc(3) called aligned_alloc(3), instead of posix_memalign(3). Instead
of returning the allocation by reference, it returns the address, just
like malloc(3).

Reviewed by:	jasone@
2012-01-09 06:36:28 +00:00
Ed Schouten
5d8c5f69f1 Fix spelling of C11 and sort functions by name. 2012-01-08 12:03:46 +00:00
Ed Schouten
b1214a51cc Improve C11 bits in <stdlib.h>:
- Add missing semicolon to quick_exit(),
- Remove `func' parameter name from at_quick_exit(),
- Fix indentation.
- Compare against 2011 value.
2011-12-26 18:55:37 +00:00
Ed Schouten
f6ab8089c6 Replace __const by const in all non-contributed source code.
As C1X is close to being released, there is no need to wrap around a
feature that is already part of C90. Most of these files already use
`const' in different placed as well.
2011-12-13 13:32:56 +00:00
David Chisnall
57979d1bd8 As per das@'s suggestion, s/__noreturn/_Noreturn/, since the latter is an
identifier reserved for the implementation in C99 and earlier so there is
no sensible reason for introducing yet another reserved identifier when we
could just use the one C1x uses.

Approved by:	brooks (mentor)
2011-12-07 21:17:50 +00:00
David Chisnall
0a31efe016 Implement quick_exit() / at_quick_exit() from C++11 / C1x. Also add a
__noreturn macro and modify the other exiting functions to use it.

The __noreturn macro, unlike __dead2, must be used BEFORE the function.
This is in line with the C and C++ specifications that place _Noreturn (c1x)
and [[noreturn]] (C++11) in front of the functions.  As with __dead2, this
macro falls back to using the GCC attribute.

Unfortunately, clang currently sets the same value for the C version macro
in C99 and C1x modes, so these functions are hidden by default.  At some
point before 10.0, I need to go through the headers and clean up the C1x /
C++11 visibility.

Reviewed by:	brooks (mentor)
2011-12-07 15:25:48 +00:00
David Chisnall
3c87aa1d3d Implement xlocale APIs from Darwin, mainly for use by libc++. This adds a
load of _l suffixed versions of various standard library functions that use
the global locale, making them take an explicit locale parameter.  Also
adds support for per-thread locales.  This work was funded by the FreeBSD
Foundation.

Please test any code you have that uses the C standard locale functions!

Reviewed by:    das (gdtoa changes)
Approved by:    dim (mentor)
2011-11-20 14:45:42 +00:00
Konstantin Belousov
585b8e0f8a Move realpath(3) prototype to a POSIX section.
Noted by:	bde
MFC after:	2 weeks
2010-04-21 16:38:37 +00:00
Konstantin Belousov
9d79ec20fb Slightly modernize realpath(3).
SUSv4 requires that implementation returns EINVAL if supplied path is NULL,
and ENOENT if path is empty string [1].
Bring prototype in conformance with SUSv4, adding restrict keywords.
Allow the resolved path buffer pointer be NULL, in which case realpath(3)
allocates storage with malloc().

PR:	kern/121897 [1]
MFC after:	2 weeks
2010-04-20 10:16:44 +00:00
Warner Losh
f2556687c6 Remove the Berkeley clause 3's.
Add a few $FreeBSD$
2010-02-16 19:39:50 +00:00
David Schultz
b38a55d49d Namespace: abort2() is a BSD extension. 2009-03-14 19:13:30 +00:00
David Schultz
d9c4315930 r189349 removed mktemp() from the XSI namespace when
__XOPEN_SOURCE >= 700, since mktemp() was withdrawn
from the standard. However, __XSI_VISIBLE is set to
700 in the default BSD envrionment, where mktemp()
should still exist; hence, check for this.
2009-03-14 02:31:48 +00:00
David Schultz
65e8b12988 - Add getsubopt and mkdtemp to the POSIX.1-2008 namespace.
- Add mkstemp to the POSIX.1-2008 and BSD namespaces.
- Remove mktemp from the XSI namespace.
2009-03-04 03:31:10 +00:00
Ed Schouten
26d4f5e969 Add two new routines: fdevname() and fdevname_r().
A more elegant way of obtaining a name of a character device by its file
descriptor on FreeBSD, is to use the FIODGNAME ioctl. Because a valid
file descriptor implies a file descriptor is visible in /dev, it will
always resolve a valid device name.

I'm adding a more friendly wrapper for this ioctl, called fdevname(). It
is a lot easier to use than devname() and also has better error
handling. When a device name cannot be resolved, it will just return
NULL instead of a generated device name that makes no sense.

Discussed with:	kib
2009-02-11 20:24:59 +00:00
David Schultz
544048ecef Add a function attribute called `__malloc_like', which informs gcc
that the annotated function returns a pointer that doesn't alias any
extant pointer. This results in a 50%+ speedup in microbenchmarks such
as the following:

    char *cp = malloc(1), *buf = malloc(BUF);
    for (i = 0; i < BUF; i++) buf[i] = *cp;

In real programs, your mileage will vary. Note that gcc already
performs this optimization automatically for any function called
`malloc', `calloc', `strdup', or `strndup' unless -fno-builtins is
used.
2009-01-31 18:27:02 +00:00
Andrey A. Chernov
c0046493c9 Add arc4random_uniform()
Obtained from:  OpenBSD
2008-07-22 11:40:42 +00:00
Andrey A. Chernov
3204108bc3 Add arc4random_buf.
Style: remove arg names from arc4random_addrandom.
2008-07-21 14:03:04 +00:00
Sean Farley
2966d28c32 Significantly reduce the memory leak as noted in BUGS section for
setenv(3) by tracking the size of the memory allocated instead of using
strlen() on the current value.

Convert all calls to POSIX from historic BSD API:
 - unsetenv returns an int.
 - putenv takes a char * instead of const char *.
 - putenv no longer makes a copy of the input string.
 - errno is set appropriately for POSIX.  Exceptions involve bad environ
   variable and internal initialization code.  These both set errno to
   EFAULT.

Several patches to base utilities to handle the POSIX changes from
Andrey Chernov's previous commit.  A few I re-wrote to use setenv()
instead of putenv().

New regression module for tools/regression/environ to test these
functions.  It also can be used to test the performance.

Bump __FreeBSD_version to 700050 due to API change.

PR:		kern/99826
Approved by:	wes
Approved by:	re (kensmith)
2007-07-04 00:00:41 +00:00
Andrey A. Chernov
ba174a5e38 Back out all POSIXified *env() changes.
Not because I admit they are technically wrong and not because of bug
reports (I receive nothing). But because I surprisingly meets so
strong opposition and resistance so lost any desire to continue that.

Anyone who interested in POSIX can dig out what changes and how
through cvs diffs.
2007-05-01 16:02:44 +00:00
Andrey A. Chernov
86580aa6fc Fix unsetenv and putenv prototypes to conform Open Group specs Issue 6
(also IEEE Std 1003.1-2001)
2007-04-30 02:27:43 +00:00
Andre Oppermann
c74dfa2faf Import of OpenBSD's strtonum(3) which is a nicer version of strtoll(3)
providing proper error checking and other improvements.

Obtained from:	OpenBSD
Requested by:	flz (to port Open[BGP|OSPF]D)
MFC after:	3 days
2006-03-14 16:57:30 +00:00
Jason Evans
b3d51d3afc Expose the posix_memalign() prototype, now that the function is implemented
by libc.
2006-01-12 07:58:59 +00:00
Tom Rhodes
257551c6a0 Add a64l(), l64a(), and l64a_r() XSI extentions. These functions convert
between a 32-bit integer and a radix-64 ASCII string.  The l64a_r() function
is a NetBSD addition.

PR:		51209 (based on submission, but very different)
Reviewed by:	bde, ru
2005-12-24 22:37:59 +00:00
Poul-Henning Kamp
866196b69d Add abort2() prototype 2005-12-23 12:28:10 +00:00
Stefan Farfeleder
9d301680d6 Fix the prototypes for devname() and devname_r(), the first two argument
types are supposed to be dev_t and mode_t (prefixed with __ due to
namespace reasons).
2005-09-12 15:58:15 +00:00
Tim J. Robbins
17ebe40096 Implement rpmatch(), a semi-standard interface (as found on AIX, Tru64,
GNU) for determining whether a string is an affirmative or negative
response to a question according to the current locale. This is done
by matching the response against nl_langinfo(3) items YESEXPR and NOEXPR.
2005-01-09 03:55:13 +00:00
Andrey A. Chernov
8720578d06 POSIX clearly states that getsubopt() should be declared in <stdlib.h>,
not in <unistd.h>
2004-02-23 03:16:59 +00:00
Marcel Moolenaar
12eb46c8bb Change the definition of NULL on ia64 (for LP64 compilations) from
an int constant to a long constant. This change improves consistency
in the following two ways:
1. The first 8 arguments are always passed in registers on ia64, which
   by virtue of the generated code implicitly widens ints to longs and
   allows the use of an 32-bit integral type for 64-bit arguments.
   Subsequent arguments are passed onto the memory stack, which does
   not exhibit the same behaviour and consequently do not allow this.
   In practice this means that variadic functions taking pointers
   and given NULL (without cast) work as long as the NULL is passed
   in one of the first 8 arguments. A SIGSEGV is more likely the
   result if such would be done for stack-based arguments. This is
   due to the fact that the upper 4 bytes remain undefined.
2. All 64-bit platforms that FreeBSD supports, with the obvious
   exception of ia64, allow 32-bit integral types (specifically NULL)
   when 64-bit pointers are expected in variadic functions by way of
   how the compiler generates code. As such, code that works correctly
   (whether rightfully so or not) on any platform other than ia64, may
   fail on ia64.

To more easily allow tweaking of the definition of NULL, this commit
removes the 12 definitions in the various headers and puts it in a
new header that can be included whenever NULL is to be made visible.

This commit fixes GNOME, emacs, xemacs and a whole bunch of ports
that I don't particularly care about at this time...
2003-12-07 21:10:06 +00:00
David E. O'Brien
0ab6a0c787 Push the alloca #error warning farther down to play nicer with some out of
tree local translator.

Requested by:	 jmallett
2003-06-25 19:06:40 +00:00
David E. O'Brien
76a1e6ad1d Fix a mismerge. 2003-06-25 18:49:36 +00:00
David E. O'Brien
d7875fc3b3 Don't blindly provide alloca() for all compilers -- it is too implementation
dependent.  Instead provide one for GCC & Intel's GCC copy and one for lint.
Anyone using any other translator tool needs to look closely at how that tool
can handle alloca.
2003-06-25 18:11:32 +00:00
David Malone
9c96ff4d54 Remove argument names from a function declaration.
Reviewed by:	phk
2003-06-22 10:34:49 +00:00
Poul-Henning Kamp
529ac58781 Add devname_r(3) which takes a buffer as argument. 2003-06-20 09:52:27 +00:00
Dag-Erling Smørgrav
79806b4cdc Use __builtin_alloca() on compilers that have it. Keep the prototype for
the benefit of lint and non-{GNU,Intel} compilers.
2003-06-15 11:01:52 +00:00
David Schultz
6a66acb565 Replace our ancient dtoa/strtod implementation with the gdtoa
package, a more recent, generalized set of routines.  Among the
changes:
- Declare strtof() and strtold() in stdlib.h.
- Add glue to libc to support these routines for all kinds
  of ``long double''.
- Update printf() to reflect the fact that dtoa works slightly
  differently now.

As soon as I see that nothing has blown up, I will kill
src/lib/libc/stdlib/strtod.c.  Soon printf() will be able
to use the new routines to output long doubles without loss
of precision, but numerous bugs in the existing code must
be addressed first.

Reviewed by:	bde (briefly), mike (mentor), obrien
2003-03-12 20:30:00 +00:00