meta: move photon/libc to root

libc/sys/horizon/unistd.h

@@ -0,0 +1,24 @@
+#ifndef SYS_LINUX_UNISTD_H_
+#define SYS_LINUX_UNISTD_H_
+
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <mio/types.h>
+
+struct stat;
+struct pollfd;
+
+extern int open(const char *pathname, int flags, ...);
+extern int openat(int dirfd, const char *pathname, int flags, ...);
+
+extern ssize_t read(int fd, void *buf, size_t count);
+extern ssize_t write(int fd, const void *buf, size_t count);
+extern int close(int fd);
+
+extern off_t lseek(int fd, off_t off, int whence);
+
+extern pid_t getpid(void);
+extern pid_t gettid(void);
+
+#endif