syscalls: isatty

kernel-src/arch/x86-64/syscall.asm

@@ -22,6 +22,7 @@ extern syscall_dup3
 extern syscall_fcntl
 extern syscall_chdir
 extern syscall_pipe2
+extern syscall_isatty
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -46,7 +47,8 @@ dq syscall_dup3
 dq syscall_fcntl
 dq syscall_chdir
 dq syscall_pipe2
-syscallcount equ 23
+dq syscall_isatty
+syscallcount equ 24
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/arch/x86-64/syscalllog.c

@@ -2,7 +2,7 @@
 #include <arch/e9.h>
 #include <arch/cpu.h>
 
-#define SYSCALL_COUNT 23
+#define SYSCALL_COUNT 24
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -28,7 +28,8 @@ static char *name[] = {
 	"dup3",
 	"fcntl",
 	"chdir",
-	"pipe2"
+	"pipe2",
+	"isatty"
 };
 
 static char *args[] = {
@@ -55,6 +56,7 @@ static char *args[] = {
 	"fd %d cmd %d arg %lu", // fcntl
 	"path %s", // chdir
 	"flags %d", // pipe2
+	"fd %d", // isatty
 };
 
 __attribute__((no_caller_saved_registers)) void arch_syscall_log(int syscall, uint64_t a1, uint64_t a2, uint64_t a3, uint64_t a4, uint64_t a5, uint64_t a6) {

kernel-src/fs/devfs.c

@@ -183,6 +183,14 @@ int devfs_access(vnode_t *node, mode_t mode, cred_t *cred) {
 	return 0;
 }
 
+int devfs_isatty(vnode_t *node) {
+	devnode_t *devnode = (devnode_t *)node;
+	if (devnode->master)
+		devnode = devnode->master;
+
+	return devnode->devops->isatty ? devnode->devops->isatty(devnode->attr.rdevminor) : ENOTTY;
+}
+
 int devfs_inactive(vnode_t *node) {
 	VOP_LOCK(node);
 	devnode_t *devnode = (devnode_t *)node;
@@ -304,7 +312,8 @@ static vops_t vnops = {
 	.inactive = devfs_enodev,
 	.mmap = devfs_mmap,
 	.munmap = devfs_munmap,
-	.getdents = devfs_getdents
+	.getdents = devfs_getdents,
+	.isatty = devfs_isatty
 };
 
 static void ctor(scache_t *cache, void *obj) {

kernel-src/include/kernel/devfs.h

@@ -16,6 +16,7 @@ typedef struct {
 	int (*poll)(int minor, int events);
 	int (*mmap)(int minor, void *addr, uintmax_t offset, int flags);
 	int (*munmap)(int minor, void *addr, uintmax_t offset, int flags);
+	int (*isatty)(int minor);
 } devops_t;
 
 typedef struct devnode_t {

kernel-src/include/kernel/vfs.h

@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <kernel/abi.h>
 #include <time.h>
+#include <errno.h>
 
 typedef struct {
 	uid_t uid;
@@ -90,6 +91,7 @@ typedef struct vops_t {
 	int (*mmap)(vnode_t *node, void *addr, uintmax_t offset, int flags, cred_t *cred);
 	int (*munmap)(vnode_t *node, void *addr, uintmax_t offset, int flags, cred_t *cred);
 	int (*getdents)(vnode_t *node, dent_t *buffer, size_t count, uintmax_t offset, size_t *readcount);
+	int (*isatty)(vnode_t *node);
 } vops_t;
 
 #define VFS_MOUNT(vfs, mp, b, d) (vfs)->ops->mount(vfs, mp, b, d)
@@ -116,7 +118,8 @@ typedef struct vops_t {
 #define VOP_MMAP(v, a, o, f, c) (v)->ops->mmap(v, a, o, f, c)
 #define VOP_MUNMAP(v, a, o, f, c) (v)->ops->munmap(v, a, o, f, c)
 #define VOP_GETDENTS(v, b, c, o, rc) (v)->ops->getdents(v, b, c, o, rc)
-#define VOP_POLL(v, p) (v)->ops->poll(v, p);
+#define VOP_POLL(v, p) (v)->ops->poll(v, p)
+#define VOP_ISATTY(v) ((v)->ops->isatty ? (v)->ops->isatty(v) : ENOTTY)
 #define VOP_HOLD(v) __atomic_add_fetch(&(v)->refcount, 1, __ATOMIC_SEQ_CST)
 #define VOP_RELEASE(v) {\
 		if (__atomic_sub_fetch(&(v)->refcount, 1, __ATOMIC_SEQ_CST) == 0) {\

kernel-src/io/console.c

@@ -153,9 +153,14 @@ static int write(int minor, void *buffer, size_t size, uintmax_t offset, int fla
 	return 0;
 }
 
+static int isatty(int minor) {
+	return 0;
+}
+
 static devops_t devops = {
 	.write = write,
-	.read = read
+	.read = read,
+	.isatty = isatty
 };
 
 void console_init() {

kernel-src/sys/syscalls/isatty.c

@@ -0,0 +1,25 @@
+#include <kernel/syscalls.h>
+#include <kernel/vfs.h>
+#include <kernel/file.h>
+
+syscallret_t syscall_isatty(context_t *context, int fd) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	// mlibc expects isatty to return 1 if a terminal and 0 if not.
+	int e = VOP_ISATTY(file->vnode);
+
+	ret.errno = e;
+	ret.ret = e ? 0 : 1;
+
+	fd_release(file);
+
+	return ret;
+}

patches/mlibc/jinx-working-patch.patch

@@ -133,7 +133,7 @@ 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..e76adfd
+index 0000000..6b6d167
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
 @@ -0,0 +1,246 @@
@@ -372,8 +372,8 @@ index 0000000..e76adfd
 +	}
 +	
 +	int sys_isatty(int fd) {
-+		// TODO UNSTUB
++		long ret;
-+		return 0;
++		return syscall(SYSCALL_ISATTY, &ret, fd);
 +	}
 +
 +	int sys_clock_get(int clock, time_t *secs, long *nanos) {
@@ -402,10 +402,10 @@ index 0000000..990eca0
 +#endif
 diff --git mlibc-workdir/sysdeps/astral/include/astral/syscall.h mlibc-workdir/sysdeps/astral/include/astral/syscall.h
 new file mode 100644
-index 0000000..e432092
+index 0000000..09c7dd4
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/include/astral/syscall.h
-@@ -0,0 +1,46 @@
+@@ -0,0 +1,47 @@
 +#ifndef _SYSCALL_H_INCLUDE
 +#define _SYSCALL_H_INCLUDE
 +
@@ -432,6 +432,7 @@ index 0000000..e432092
 +#define SYSCALL_FCNTL 20
 +#define SYSCALL_CHDIR 21
 +#define SYSCALL_PIPE2 22
++#define SYSCALL_ISATTY 23
 +
 +#include <stddef.h>
 +#include <stdint.h>