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[libc] Add syscall.h

This is the set of needed syscalls that system has to supply.

--- /dev/null

+++ b/libc/src/syscall.h

@@ -1,0 +1,11 @@

+/* See LICENSE file for copyright and license details. */

+

+extern void *_brk(void *addr);

+extern int _open(char *path, int flags, int perm);

+extern int _close(int fd);

+extern int _read(int fd, void *buf, size_t n);

+extern int _write(int fd, void *buf, size_t n);

+extern int _lseek(int fd, long off, int whence);

+extern void _Exit(int status);

+extern int raise(int sig);

+extern void (*signal(int sig, void (*func)(int)))(int);