tty: add ttyname ioctl

kernel-src/io/tty.c

@@ -295,6 +295,8 @@ static int poll(int minor, polldata_t *data, int events) {
 #define TIOCSCTTY 0x540E
 #define TIOCGPGRP 0x540F
 #define TIOCSPGRP 0x5410
+#define TTY_IOCTL_NAME 0x771101141113l
+#define TTY_NAME_MAX 32
 
 int tty_ioctl(tty_t *tty, unsigned long req, void *arg, int *result) {
 	switch (req) {
@@ -350,6 +352,11 @@ int tty_ioctl(tty_t *tty, unsigned long req, void *arg, int *result) {
 			PROC_RELEASE(proc);
 			return error;
 		}
+		case TTY_IOCTL_NAME: {
+			size_t len = min(strlen(tty->name) + 1, TTY_NAME_MAX);
+			memcpy(arg, tty->name, len);
+			break;
+		}
 		default:
 			return ENOTTY;
 	}

patches/mlibc/jinx-working-patch.patch

@@ -192,10 +192,10 @@ index 0000000..e5b087a
 +
 diff --git mlibc-workdir/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
 new file mode 100644
-index 0000000..e94f84f
+index 0000000..0755fba
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
-@@ -0,0 +1,694 @@
+@@ -0,0 +1,714 @@
 +#include <bits/ensure.h>
 +#include <mlibc/debug.hpp>
 +#include <mlibc/all-sysdeps.hpp>
@@ -284,6 +284,26 @@ index 0000000..e94f84f
 +		return ENOSYS;
 +	}
 +
++	#ifndef MLIBC_BUILDING_RTLD
++	#define TTY_IOCTL_NAME 0x771101141113l
++	#define TTY_NAME_MAX 32
++	#define TTY_PREFIX "/dev/"
++
++	
++	int sys_ttyname(int fd, char * buffer, size_t size) {
++		size_t prefixlen = strlen(TTY_PREFIX);
++		if (size < TTY_NAME_MAX + prefixlen) {
++			mlibc::panicLogger() << "ttyname size too small" << frg::endlog;
++			__builtin_unreachable();
++		}
++
++		strcpy(buffer, TTY_PREFIX);
++
++		int res;
++		return sys_ioctl(fd, TTY_IOCTL_NAME, (void *)(buffer + prefixlen), &res);
++	}
++	#endif
++
 +	int sys_fsync(int fd) {
 +		long ret;
 +		return syscall(SYSCALL_FSYNC, &ret, fd);