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intercept.h
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intercept.h
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/* {{{
This file is part of libtraceproc - a library for tracing Pro*C/OCI calls
Copyright (C) 2013 Georg Sauthoff <mail@georg.so>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
}}} */
#ifndef INTERCEPT_H
#define INTERCEPT_H
#define INTERCEPT_SETUP(A) \
static int setup_ ## A() \
{ \
/* clear existing error */ \
dlerror(); \
/* cast workaround, see linux man page example */ \
*(void**) (&fn_table. A) = dlsym(RTLD_NEXT, #A); \
const char *error = dlerror(); \
if (error) { \
fprintf(stderr, "dlsym failed: %s\n", error); \
return -1; \
} \
return 0; \
}
/*
void *handle = dlopen("libclntsh.so", RTLD_LAZY);
if (!handle) {
fprintf(stderr, "dlopen failed: %s\n", dlerror());
exit(23);
}
*/
#endif