32d9eeeecf
From kettenis@ People have suggested using pthread_atfork(3) before, but discarded the idea because it involves linking with -lpthread, which has other undesirable consequences. However: * Most systems actually have pthread_atfork(3) in libc. I verified this on OS X and Solaris. I believe this is the case on Linux systems that use musl as well. * On Linux systems that use glibc, this isn't the case. However, those systems have __register_atfork(3), which is fully documented in the "Linux Standard Base Core Specification". ok kettenis@ deraadt@ beck@
15 lines
482 B
C
15 lines
482 B
C
#include <pthread.h>
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static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
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#define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx)
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#define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx)
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#ifdef __GLIBC__
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extern void *__dso_handle;
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extern int __register_atfork(void (*)(void), void(*)(void), void (*)(void), void *);
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#define _ARC4_ATFORK(f) __register_atfork(NULL, NULL, (f), __dso_handle)
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#else
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#define _ARC4_ATFORK(f) pthread_atfork(NULL, NULL, (f))
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#endif
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