# include "config.h"
#endif
-#include <pthread.h>
#include <dlfcn.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "v4l2.h"
-static void *v4l2_handle = NULL;
-static int (*v4l2_fd_open_) (int, int);
-int (*v4l2_close) (int);
-int (*v4l2_ioctl) (int, unsigned long int, ...);
-ssize_t (*v4l2_read) (int, void *, size_t);
-void * (*v4l2_mmap) (void *, size_t, int, int, int, int64_t);
-int (*v4l2_munmap) (void *, size_t);
-
static int fd_open (int fd, int flags)
{
(void) flags;
return fd;
}
+static void *v4l2_handle = NULL;
+
+int (*v4l2_fd_open) (int, int) = fd_open;
+//int (*v4l2_open) (const char *, int, ...) = open;
+//int (*v4l2_dup) (const char *, int, ...) = dup;
+int (*v4l2_close) (int) = close;
+int (*v4l2_ioctl) (int, unsigned long int, ...) = ioctl;
+ssize_t (*v4l2_read) (int, void *, size_t) = read;
+//ssize_t (*v4l2_write) (int, const void *, size_t) = write;
+void * (*v4l2_mmap) (void *, size_t, int, int, int, int64_t) = mmap;
+int (*v4l2_munmap) (void *, size_t) = munmap;
+
+__attribute__((constructor))
static void v4l2_lib_load (void)
{
void *h = dlopen ("libv4l2.so.0", RTLD_LAZY | RTLD_LOCAL);
if (h == NULL)
- goto fallback;
+ return;
- v4l2_fd_open_ = dlsym (h, "v4l2_fd_open");
- v4l2_close = dlsym (h, "v4l2_close");
- v4l2_ioctl = dlsym (h, "v4l2_ioctl");
- v4l2_read = dlsym (h, "v4l2_read");
- v4l2_mmap = dlsym (h, "v4l2_mmap");
- v4l2_munmap = dlsym (h, "v4l2_munmap");
+ void *sym;
+#define SYM(name) \
+ sym = dlsym (h, "v4l2_"#name); \
+ if (sym != NULL) v4l2_##name = sym
- if (v4l2_fd_open_ != NULL && v4l2_close != NULL && v4l2_ioctl != NULL
- && v4l2_read != NULL && v4l2_mmap != NULL && v4l2_munmap != NULL)
- {
- v4l2_handle = h;
- return;
- }
+ SYM(fd_open); /*SYM(open); SYM(dup);*/ SYM(close); SYM(ioctl);
+ SYM(read); /*SYM(write);*/ SYM(mmap); SYM(munmap);
- dlclose (h);
-fallback:
- v4l2_fd_open_ = fd_open;
- v4l2_close = close;
- v4l2_ioctl = ioctl;
- v4l2_read = read;
- v4l2_mmap = mmap;
- v4l2_munmap = munmap;
+ v4l2_handle = h;
}
__attribute__((destructor))
if (v4l2_handle != NULL)
dlclose (v4l2_handle);
}
-
-int v4l2_fd_open (int fd, int flags)
-{
- static pthread_once_t once = PTHREAD_ONCE_INIT;
-
- pthread_once (&once, v4l2_lib_load);
- return v4l2_fd_open_ (fd, flags);
-}