Where can i find __ioctl?

Question

In the android sdk path sdk/bionic/libc/bionic/ there are the C API resource code, such as fork.c, ioctl.c etc.. when open ioctl.c:

#include <stdarg.h> extern int __ioctl(int, int, void *); int ioctl(int fd, int request, ...) { va_list ap; void * arg; enter code here va_start(ap, request); arg = va_arg(ap, void *); va_end(ap); return __ioctl(fd, request, arg); }

extern int __ioctl(int, int, void *); this means __ioctl(int, int, void *) has been defined somewhere. So I want to know where is the original defined place. Thanks a lot!

madCdan · Accepted Answer · 2013-10-05 07:00:11Z

As mentioned, the _ioctl is just a wrapper to a syscall, implemented in asm. In the AOSP code, it can be found in bionic/libc/arch-XXX/syscalls/_ioctl.S where arch-XXX is arch-arm, arch-x86 or arch-mips depending on your target architecture.

R.. GitHub STOP HELPING ICE · Accepted Answer · 2013-10-05 04:45:24Z

It may be elsewhere in the bionic tree (grep is your friend), or automatically generated as part of the build process, but either way, it's completely uninteresting. It's just a syscall wrapper. All of the interesting work is in the kernel.

Collectives™ on Stack Overflow

Where can i find __ioctl?

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related