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Added hack to patch the glibc errno_location to jump to our function, 

based on a patch by Marcus Meissner.
This commit is contained in:
Alexandre Julliard 2003-04-03 03:50:56 +00:00
parent 6a9cea957a
commit ff152b650f
1 changed files with 22 additions and 1 deletions
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23
scheduler/sysdeps.c
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@ -411,6 +411,22 @@ int *__h_errno_location(void)
#endif /* HAVE_NPTL */
#if defined(__linux__) && defined(__i386__)
static inline void writejump( const char *symbol, void *dest )
{
unsigned char *addr = wine_dlsym( RTLD_NEXT, symbol, NULL, 0 );
if (!addr) return;
/* write a relative jump at the function address */
mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC|PROT_WRITE);
addr[0] = 0xe9;
*(int *)(addr+1) = (unsigned char *)dest - (addr + 5);
mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC);
}
#endif
/***********************************************************************
* SYSDEPS_InitErrno
*
@ -421,7 +437,12 @@ void SYSDEPS_InitErrno(void)
#ifndef HAVE_NPTL
errno_location_ptr = thread_errno_location;
h_errno_location_ptr = thread_h_errno_location;
#endif
# if defined(__linux__) && defined(__i386__)
writejump( "__errno_location", thread_errno_location );
writejump( "__h_errno_location", thread_h_errno_location );
# endif
#endif /* HAVE_NPTL */
}