Shared libraries error

[shrikar archak]

Hi all,
I am trying to have a version of open system call which is something like this
here When i want to induce error it should not call the open instead should return error
in our case controlled by OPEN_INDEX other wise the usual open system call should be called.


int open(const char * path, int flags, mode_t mode) {
    action a;
    int old_errno;
    int rv;

    if (fig_error(OPEN_INDEX, &a)) {
        log(INJECTED, "open(%s %d %d) Induced error - going to return %d, errno = %d\n", path, flags, mode, a.ret, a.err);
        errno = a.err;
        return (int) a.ret;
    } else {
        rv = (int) __libc_open(path, flags, mode);
        old_errno = errno;
        log(ALL, "open(%s %d %d) library returning %d, errno = %d\n", path, flags, mode, rv, errno);        errno = old_errno;
        return rv;
    }

}

once i preload this library i get this error
This snippet taken from fault injection in GLibc.

shrikar at shrikar-desktop:~/fig/src$ ls
ls: symbol lookup error: /home/shrikar/fig/src/libfig.so: undefined symbol: __libc_open

i have compiled the shared library with -shared -ldl option

Thanks
Shrikar

 				
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