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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
static const char *munge(const char *n) {
static const char *e = NULL;
static size_t elen;
if (!e) {
e = getenv("WIX");
if (!e)
return n;
elen = strlen(e);
}
const char *last_slash = strrchr(n, '/');
if (!last_slash)
return n;
if (last_slash - n > elen && !strncmp(last_slash - elen, e, elen))
return last_slash - elen;
return n;
}
#define dofunc(rettype,sym,proto,proto2) \
rettype sym proto { \
rettype (*real) proto; \
real = dlsym(RTLD_NEXT, #sym); \
fname = munge(fname); \
return real proto2; \
}
dofunc(int,open,(const char *fname,int flags,mode_t mode),(fname,flags,mode))
dofunc(int,open64,(const char *fname,int flags,mode_t mode),(fname,flags,mode))
dofunc(int,__open,(const char *fname,int flags,mode_t mode),(fname,flags,mode))
dofunc(int,__open64,(const char *fname,int flags,mode_t mode),(fname,flags,mode))
dofunc(int,stat,(const char *fname,struct stat *sbuf),(fname,sbuf))
dofunc(int,lstat,(const char *fname,struct stat *sbuf),(fname,sbuf))
dofunc(int,access,(const char *fname,int mode),(fname,mode))
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