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linux-user: identify running binary in /proc/self/exe

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Some applications like to test /proc/self/exe to find
out who they are. Fake the result of readlink() for
them. Use realpath() to return full path to binary
(which the links /proc/self/exe are)

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6485 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-01-30 20:09:01 +00:00
parent 04a6dfebb6
commit d088d664f2
3 changed files with 16 additions and 3 deletions
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15
linux-user/syscall.c
View file

@ -4410,13 +4410,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#endif
case TARGET_NR_readlink:
{
void *p2;
void *p2, *temp;
p = lock_user_string(arg1);
p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (!p || !p2)
ret = -TARGET_EFAULT;
else
ret = get_errno(readlink(path(p), p2, arg3));
else {
if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) {
char real[PATH_MAX];
temp = realpath(exec_path,real);
ret = (temp==NULL) ? get_errno(-1) : strlen(real) ;
snprintf((char *)p2, arg3, "%s", real);
}
else
ret = get_errno(readlink(path(p), p2, arg3));
break;
}
unlock_user(p2, arg2, ret);
unlock_user(p, arg1, 0);
}