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Particularly noticeable in ports like openssl, which like to map the
entire error message set from 0 through 128 on startup.
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Currently, ZSH tries to call this function and it always asserts,
so adding a stub to allow ZSH at least open.
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Other software might not expect these to be defined and behave
differently if they _are_ defined, e.g. scummvm which checks if
the TODO macro is defined and fails to build if it is.
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This implements the dladdr() function which lets the caller look up
the symbol name, symbol address as well as library name and library
base address for an arbitrary address.
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By returning nullptr we're telling the caller that setlocale() failed.
Some programs expect setlocale() to succeed so let's pretend that it
did.
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Acquire ordering should be sufficient for pthread_mutex_lock
and pthread_mutex_trylock.
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This ensures the store to mutex->lock doesn't get re-ordered before
the store to mutex->owner which could otherwise result in a locked
owner-less mutex if another thread tries to acquire the lock at
the same time.
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POSIX (`errno(3p)`) states that errno should not be set to zero.
This helps with applications that don't expect errno to get updated
unless an intermediate syscall also fails.
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Previously there was no way to output an empty value into the shadow
file entries when the spwd members were disabled. This would cause new
user entries to the shadow file to be cluttered with disabled values.
This commit checks if the spwd member value is diabled (-1) and will
output as appropriate.
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wint_t is also not supposed to be defined by sys/types.h, but should
be defined in wchar.h instead. Since we require it for our definition of
btowc, let's move it to the correct place.
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These functions are used by gnulib (and therefore many GNU utilities)
to provide access to internal details of the stdio FILE structure.
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Previously we'd leak memory when the user called realloc(p, 0). Instead
this call should behave as if the user had called free(p).
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The POSIX man-page states that inet_pton returns 0 if the input is not a
valid IPv4 dotted-decimal string or a valid IPv6 address string. This is
also how it is implemented in SerenityOS.
This means that we should treat a return value of 0 as an error to avoid
using an invalid address (or 0.0.0.0).
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There's no alignment requirements on a char[4] buffer, so this was
causing unaligned reads that were caught by UBSAN.
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Take Kernel/UBSanitizer.cpp and make a copy in LibSanitizer.
We can use LibSanitizer to hold other sanitizers as people implement
them :^).
To enable UBSAN for LibC, DynamicLoader, and other low level system
libraries, LibUBSanitizer is built as a serenity_libc, and has a static
version for LibCStatic to use. The approach is the same as that taken in
Note that this means now UBSAN is enabled for code generators, Lagom,
Kernel, and Userspace with -DENABLE_UNDEFINED_SANTIZER=ON. In userspace
however, UBSAN is not deadly (yet).
Co-authored-by: ForLoveOfCats <ForLoveOfCats@vivaldi.net>
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This implements the XSI-compliant version of strerror_r() - as opposed
to the GNU-specific variant.
The function explicitly saves errno so as to not accidentally change it
with one of the calls to other functions.
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We ignore \0177 in the terminal -- as the ANSI standard dictates.
Fixes #7415
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Previously each malloc size class would keep around a limited number of
unused blocks which were marked with MADV_SET_VOLATILE which could then
be reinitialized when additional blocks were needed.
This changes malloc() so that it also keeps around a number of blocks
without marking them with MADV_SET_VOLATILE. I termed these "hot"
blocks whereas blocks which were marked as MADV_SET_VOLATILE are called
"cold" blocks because they're more expensive to reinitialize.
In the worst case this could increase memory usage per process by
1MB when a program requests a bunch of memory and frees all of it.
Also, in order to make more efficient use of these unused blocks
they're now shared between size classes.
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Also rename the "LibThread" namespace to "Threading"
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This reverts commit 800ea8ea969835297dc7e7da345a45b9dc5e751a.
Booting the system no longer worked after these changes.
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Problem:
- `static` variables consume memory and sometimes are less
optimizable.
- `static const` variables can be `constexpr`, usually.
- `static` function-local variables require an initialization check
every time the function is run.
Solution:
- If a global `static` variable is only used in a single function then
move it into the function and make it non-`static` and `constexpr`.
- Make all global `static` variables `constexpr` instead of `const`.
- Change function-local `static const[expr]` variables to be just
`constexpr`.
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Hook the kernel page fault handler and capture page fault events when
the fault has a current thread attached in TLS. We capture the eip and
ebp so we can unwind the stack and locate which pieces of code are
generating the most page faults.
Co-authored-by: Gunnar Beutner <gbeutner@serenityos.org>
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This adds the -t command-line argument for the profile tool. Using this
argument you can filter which event types you want in your profile.
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This commit adds the statvfs() and fstatvfs() functions into LibC.
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This reverts commit f91bcb8895cd6b76b2977ad0632fef521ba2f1d1.
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This improves thread-safety because ptsname() is using a global
buffer that is shared between threads.
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Problem:
- Function local `constexpr` variables do not need to be
`static`. This consumes memory which is unnecessary and can prevent
some optimizations.
Solution:
- Remove `static` keyword.
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Problem:
- `size_classes` is a C-style array which makes it difficult to use in
algorithms.
- `all_of` algorithm is re-written for the specific implementation.
Solution:
- Change `size_classes` to be an `Array`.
- Directly use the generic `all_of` algorithm instead of
reimplementing.
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Unlike accept() the new accept4() system call lets the caller specify
flags for the newly accepted socket file descriptor, such as
SOCK_CLOEXEC and SOCK_NONBLOCK.
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This commit adds support for the various ECHO* lflags and fixes some
POSIX conformance issues around newline handling. Also included are
error messages when setting not implemented settings.
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This fixes a few compiler warnings and makes some variables const-ref
in preparation for the next commit which changes how ByteBuffer works.
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This non-POSIX header is used in Linux/BSD systems for storing the
default termios settings. This lets us setup new TTYs' `m_termios.c_cc`
in a nicer way than using a magic string.
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