site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com The extra __ prefix has no special meaning, but is a convention indicating that applications should not make use of that symbol directly — it is an internal implementation detail of the OS. These syscall stubs are generated by the Libsyscall subproject of xnu. Kevin On May 1, 2010, at 1:32 PM, Ariel Feinerman wrote:

2010/4/23 Jean-Daniel Dupas <devlists@shadowlab.org>

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Le 22 avr. 2010 à 23:16, Ariel Feinerman a écrit :

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I look at libc`s posix_spawn() function, one calls __posix_spawn() internally, I think __posix_spawn() is system call, but I learn xnu source by grep carefully, threre is only one function: posix_spawn(). What is __ ?

nm libSystem.dylib 0000000000048020 t ___posix_spawn

Answer: a libSystem internal symbol (aka implementation detail). What are you trying to do ?

Nothing, I want to look at __posix_spawn() source when I learn libc implementation. So does it means __posix_spawn() prototype in libc is posix_spawn() prototype in xnu? For example if I want to call function from kernel or implement wrapper I need to insert __ ?

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