isatty syscall

src/arch/x86_64/syscall.asm

@@ -9,7 +9,8 @@ extern syscall_open
 extern syscall_read
 extern syscall_lseek
 extern syscall_close
-func_count equ 8
+extern syscall_isatty
+func_count equ 9
 
 
 func_table:
@@ -21,6 +22,7 @@ func_table:
 	dq syscall_read
 	dq syscall_lseek
 	dq syscall_close
+	dq syscall_isatty
 section .text
 global asm_syscall_entry
 

src/fs/vfs.c

@@ -78,6 +78,15 @@ int vfs_write(int* error, vnode_t* node, void* buff, size_t count, size_t offset
 	
 }
 
+int vfs_isatty(vnode_t* node){
+	
+	if(GETTYPE(node->st.st_mode) != TYPE_CHARDEV)
+		return ENOTTY;
+	
+	return devman_isatty(node->st.st_rdev);
+	
+}
+
 int vfs_read(int* error, vnode_t* node, void* buff, size_t count, size_t offset){
 	
 	int type = GETTYPE(node->st.st_mode);

src/include/kernel/devman.h

@@ -7,11 +7,13 @@
 typedef struct{
 	int (*read)(int* error, int minor, void* buff, size_t count, size_t offset);
 	int (*write)(int* error, int minor, void* buff, size_t count, size_t offset);
+	int (*isatty)(int minor);
 } devcalls;
 
 int devman_read(int *error, int dev, void* buff, size_t count, size_t offset);
 int devman_write(int *error, int dev, void* buff, size_t count, size_t offset);
 int devman_newdevice(char* name, int type, int major, int minor, devcalls* calls);
+int devman_isatty(int dev);
 void devman_init();
 
 #endif

src/include/kernel/vfs.h

@@ -67,6 +67,7 @@ int vfs_mkdir(dirnode_t* ref, char* path, mode_t mode);
 int vfs_create(dirnode_t* ref, char* path, mode_t mode);
 int vfs_write(int* error, vnode_t* node, void* buff, size_t count, size_t offset);
 int vfs_read(int* error, vnode_t* node, void* buff, size_t count, size_t offset);
+int vfs_isatty(vnode_t* node);
 
 void vfs_init();
 dirnode_t* vfs_root();

src/sys/devman.c

@@ -47,6 +47,15 @@ int devman_read(int *error, int dev, void* buff, size_t count, size_t offset){
 
 }
 
+int devman_isatty(int dev){
+	
+	if(major(dev) > highestmajor)
+		return ENOTTY;
+	
+	return majorcalls[major(dev)]->isatty(minor(dev));
+	
+}
+
 void devman_init(){
 	
 	devfs_init();

src/sys/syscalls/isatty.c

@@ -0,0 +1,38 @@
+#include <kernel/syscalls.h>
+#include <kernel/fd.h>
+#include <kernel/vfs.h>
+#include <arch/cls.h>
+#include <kernel/sched.h>
+#include <arch/spinlock.h>
+
+syscallret syscall_isatty(int ifd){
+	
+	syscallret retv;
+        retv.ret = -1;
+	
+	proc_t* proc = arch_getcls()->thread->proc;
+
+        fd_t* fd = proc->fds + ifd;
+
+        spinlock_acquire(&proc->fdlock);
+        
+	if(proc->fdcount <= ifd || fd->node == NULL){
+                spinlock_release(&proc->fdlock);
+                retv.errno = EBADF;
+                return retv;
+        }
+
+        spinlock_acquire(&fd->lock);
+        spinlock_release(&proc->fdlock);
+
+	int ret = vfs_isatty(fd->node);
+	
+	retv.errno = ret;
+
+	retv.ret = retv.errno == ENOTTY ? 0 : 1;
+
+	spinlock_release(&fd->lock);
+
+	return retv;
+	
+}