syscalls: fcntl stub

src/sys/syscalls/fcntl.c

@@ -0,0 +1,50 @@
+#include <kernel/syscalls.h>
+#include <kernel/fd.h>
+#include <arch/cls.h>
+
+#define F_DUPFD  0
+#define F_GETFD  1
+#define F_SETFD  2
+#define F_GETFL  3
+#define F_SETFL  4
+
+#define UNKNOWN "astral: unknown fcntl\n"
+
+syscallret syscall_fcntl(int ifd, int cmd, uint64_t arg){
+	
+	syscallret retv;
+	retv.ret = -1;
+	
+	fd_t* fd = NULL;
+
+	if(cmd != F_DUPFD){
+		retv.errno = fd_access(&arch_getcls()->thread->proc->fdtable, &fd, ifd);
+		if(retv.errno)
+			return retv;
+	}
+
+
+	switch(cmd){
+		case F_GETFD: // no fd flags implemented
+		case F_SETFD:
+			retv.ret = 0;
+			break;
+		case F_GETFL:
+			retv.ret = fd->flags;
+			break;
+		case F_SETFL: // no useful status flags implemented
+			retv.ret = 0;
+			break;
+		default:
+			console_write(UNKNOWN, strlen(UNKNOWN));
+			retv.errno = EINVAL;
+			return retv;
+	}
+
+	if(fd)
+		fd_release(fd);
+
+	retv.errno = 0;
+	return retv;
+
+}