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musl - an implementation of the standard library for Linux-based systems
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previously, if a file descriptor had aio operations pending in the parent before fork, attempting to close it in the child would attempt to cancel a thread belonging to the parent. this could deadlock, fail, or crash the whole process of the cancellation signal handler was not yet installed in the parent. in addition, further use of aio from the child could malfunction or deadlock. POSIX specifies that async io operations are not inherited by the child on fork, so clear the entire aio fd map in the child, and take the aio map lock (with signals blocked) across the fork so that the lock is kept in a consistent state. |
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musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/