21 files changed, 839 insertions, 22 deletions

diff --git a/src/cmd/Makefile b/src/cmd/Makefile
index 0cde3ff..7c51ebf 100644
--- a/src/cmd/Makefile
+++ b/src/cmd/Makefile
@@ -22,6 +22,8 @@ all:
 		LIBC_DIR=$(shell pwd)/../$(LIBC_DIR)
 	cd cat/; make LDSCRIPT=$(LDSCRIPT) CC=$(CC) AS=$(AS) LD=$(LD) SYSROOT=$(SYSROOT) \
 		LIBC_DIR=$(shell pwd)/../$(LIBC_DIR)
+	cd mex/; make LDSCRIPT=$(LDSCRIPT) CC=$(CC) AS=$(AS) LD=$(LD) SYSROOT=$(SYSROOT) \
+		LIBC_DIR=$(shell pwd)/../$(LIBC_DIR)
 
 .PHONY: clean
 clean:
@@ -33,3 +35,4 @@ clean:
 	cd login/; make clean
 	cd echo/; make clean
 	cd cat/; make clean
+	cd mex/; make clean
diff --git a/src/cmd/mex/Makefile b/src/cmd/mex/Makefile
new file mode 100644
index 0000000..bc88287
--- /dev/null
+++ b/src/cmd/mex/Makefile
@@ -0,0 +1,18 @@
+include ../../data/build/user.mk
+
+CFILES = $(shell find . -name "*.c")
+CFILES = $(shell find . -name "*.c")
+CFLAGS = -L$(LIBC_DIR) -lc $(INTERNAL_CFLAGS) \
+		 -L../../lib/libwidget -lwidget -L../../lib/libc/ -lc \
+		 -I../../lib/libwidget/include/
+OBJECTS = $(CFILES:%.c=%.o)
+
+$(SYSROOT)/usr/bin/mex: $(OBJECTS)
+	$(LD) $(OBJECTS) -o $@ $(CFLAGS)
+
+%.o: %.c
+	$(CC) $(INTERNAL_CFLAGS) -c $(CFLAGS) $< -o $@
+
+.PHONY: clean
+clean:
+	rm -f *.o *.d
diff --git a/src/cmd/mex/mex.c b/src/cmd/mex/mex.c
new file mode 100644
index 0000000..da501c3
--- /dev/null
+++ b/src/cmd/mex/mex.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <stddef.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#define LINE_LEN 16
+
+static void
+dump_line(const char *line, size_t len)
+{
+    /* The amount of bytes we write */
+    const uint8_t BYTE_COUNT = 2;
+
+    for (size_t i = 0; i < LINE_LEN; ++i) {
+        if (i < len) {
+            printf("%02x", line[i] & 0xFF);
+        } else {
+            printf("  ");
+        }
+
+        /* Put spacing between bytes */
+        if (((i + 1) % BYTE_COUNT) == 0) {
+            printf(" ");
+        }
+    }
+
+    printf(" ");
+    for (size_t i = 0; i < len; ++i) {
+        if (line[i] > 31 && line[i] < 127) {
+            printf("%c", line[i]);
+        } else {
+            printf(".");
+        }
+    }
+
+    printf("\n");
+}
+
+static void
+dump_file(int fd)
+{
+    char buf[LINE_LEN];
+    ssize_t count;
+    size_t offset = 0;
+
+    for (;;) {
+        count = read(fd, buf, sizeof(char) * LINE_LEN);
+        if (count <= 0) {
+            break;
+        }
+
+        printf("%08x: ", offset);
+        offset += LINE_LEN;
+        dump_line(buf, count);
+    }
+}
+
+int
+main(int argc, char **argv)
+{
+    int fd;
+
+    if (__argc < 2) {
+        printf("mex: usage: mex <filename>\n");
+        return -1;
+    }
+
+    if ((fd = open(__argv[1], O_RDONLY)) < 0) {
+        printf("mex: failed to open input\n");
+        return fd;
+    }
+
+    dump_file(fd);
+    close(fd);
+    return 0;
+}
diff --git a/src/lib/libc/include/unistd.h b/src/lib/libc/include/unistd.h
index b668d5b..61b437c 100644
--- a/src/lib/libc/include/unistd.h
+++ b/src/lib/libc/include/unistd.h
@@ -30,6 +30,7 @@
 #ifndef _UNISTD_H
 #define _UNISTD_H 1
 
+#include <sys/seek.h>
 #include <stddef.h>
 
 /* Standard stream file numbers */
@@ -74,4 +75,13 @@ ssize_t write(int fd, const void *buf, size_t count);
  */
 ssize_t read(int fd, void *buf, size_t count);
 
+/*
+ * Reposition the file offset of a file
+ *
+ * @fd: File descriptor to reposition
+ * @offset: Offset to move `fd' to
+ * @whence: How it should be repositioned
+ */
+off_t lseek(int fd, off_t offset, int whence);
+
 #endif  /* _UNISTD_H */
diff --git a/src/lib/libc/src/unistd/lseek.c b/src/lib/libc/src/unistd/lseek.c
new file mode 100644
index 0000000..ade0a1e
--- /dev/null
+++ b/src/lib/libc/src/unistd/lseek.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <errno.h>
+
+off_t
+lseek(int fd, off_t offset, int whence)
+{
+    if (fd < 0) {
+        return -EBADF;
+    }
+
+    return syscall(
+        SYS_lseek,
+        fd,
+        offset,
+        whence
+    );
+}
diff --git a/src/sys/fs/devfs.c b/src/sys/fs/devfs.c
index 7553003..729449a 100644
--- a/src/sys/fs/devfs.c
+++ b/src/sys/fs/devfs.c
@@ -160,7 +160,7 @@ static struct vop devfs_vops = {
     .lookup = devfs_lookup
 };
 
-struct vfsops g_devfs_vfops = {
+struct vfsops g_devfs_vfsops = {
     .init = devfs_init,
     .mount = devfs_mount
 };
diff --git a/src/sys/fs/tmpfs.c b/src/sys/fs/tmpfs.c
new file mode 100644
index 0000000..af1537f
--- /dev/null
+++ b/src/sys/fs/tmpfs.c
@@ -0,0 +1,363 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <sys/syslog.h>
+#include <sys/errno.h>
+#include <sys/queue.h>
+#include <sys/param.h>
+#include <os/vnode.h>
+#include <os/kalloc.h>
+#include <string.h>
+
+#define TMPFS_NAMEMAX 128
+#define TMPFS_INIT_SIZE 8
+
+/*
+ * Represents a single tmpfs node
+ */
+struct tmpfs_node {
+    char name[TMPFS_NAMEMAX];
+    char *data;
+    size_t len;
+    size_t real_len;
+    int ref;
+    TAILQ_ENTRY(tmpfs_node) link;
+};
+
+#define tmpfs_ref(TMP_NODEP) \
+    atomic_inc_int(&(TMP_NODEP)->ref)
+
+static TAILQ_HEAD(, tmpfs_node) tmpfs;
+static struct vop tmpfs_vops;
+
+/*
+ * Create a new tmpfs node
+ *
+ * @name: Name of node to create
+ * @np_res: Result pointer is written here
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+static int
+tmpfs_new(const char *name, struct tmpfs_node **np_res)
+{
+    struct tmpfs_node *np;
+    size_t name_len;
+
+    if (name == NULL) {
+        return -EINVAL;
+    }
+
+    name_len = strlen(name);
+    if (name_len > sizeof(np->name) - 1) {
+        return -ENAMETOOLONG;
+    }
+
+    np = kalloc(sizeof(*np));
+    if (np == NULL) {
+        return -ENOMEM;
+    }
+
+    memset(np, 0, sizeof(*np));
+    np->data = kalloc(TMPFS_INIT_SIZE);
+    if (np->data == NULL) {
+        kfree(np);
+        return -ENOMEM;
+    }
+
+    np->real_len = 0;
+    np->len = TMPFS_INIT_SIZE;
+    np->ref = 1;
+    memset(np->data, 0, TMPFS_INIT_SIZE);
+    memcpy(np->name, name, name_len);
+
+    if (np_res != NULL) {
+        *np_res = np;
+    }
+
+    TAILQ_INSERT_TAIL(&tmpfs, np, link);
+    return 0;
+}
+
+/*
+ * Lookup a tmpfs node by name
+ *
+ * @name: Name to lookup
+ * @np_res: Result is written here
+ */
+static int
+tmpfs_byname(const char *name, struct tmpfs_node **np_res)
+{
+    struct tmpfs_node *npcur;
+    int retval = -ENOENT;
+
+    if (name == NULL || np_res == NULL) {
+        return -EINVAL;
+    }
+
+    TAILQ_FOREACH(npcur, &tmpfs, link) {
+        if (npcur == NULL) {
+            continue;
+        }
+
+        if (strcmp(npcur->name, name) == 0) {
+            retval = 0;
+            *np_res = npcur;
+            break;
+        }
+    }
+
+    return retval;
+}
+
+/*
+ * VFS tmpfs lookup callback
+ */
+static int
+tmpfs_lookup(struct vop_lookup_args *args)
+{
+    struct tmpfs_node *np;
+    struct vnode *vp;
+    int error;
+
+    /* Sanity checks */
+    if (args == NULL)
+        return -EINVAL;
+    if (args->name == NULL)
+        return -EINVAL;
+    if (args->vpp == NULL)
+        return -EINVAL;
+
+    error = tmpfs_byname(args->name, &np);
+    if (error < 0) {
+        return error;
+    }
+
+    error = vfs_valloc(&vp, VTYPE_FILE, 0);
+    if (error < 0) {
+        return error;
+    }
+
+    /* Ref that node and give it */
+    tmpfs_ref(np);
+    vp->data = np;
+    vp->vops = &tmpfs_vops;
+    *args->vpp = vp;
+    return 0;
+}
+
+/*
+ * Create a tmpfs node
+ */
+static int
+tmpfs_create(struct vop_create_args *args)
+{
+    struct nameidata *ndp;
+    struct tmpfs_node *np = NULL;
+
+    if (args == NULL) {
+        return -EINVAL;
+    }
+
+    if ((ndp = args->ndp) == NULL) {
+        return -EINVAL;
+    }
+
+    /* Does it already exist? */
+    if (tmpfs_byname(ndp->path, &np) == 0) {
+        return -EEXIST;
+    }
+
+    return tmpfs_new(ndp->path, NULL);
+}
+
+/*
+ * Initialize the temporary filesystem
+ */
+static int
+tmpfs_init(struct fs_info *fip)
+{
+    TAILQ_INIT(&tmpfs);
+    return 0;
+}
+
+/*
+ * Mount the filesystem
+ */
+static int
+tmpfs_mount(struct fs_info *fip, struct mount_args *margs)
+{
+    int error;
+    struct vnode *vp;
+
+    if (fip == NULL || margs == NULL) {
+        return -1;
+    }
+
+    /* Allocate a vnode for this mountpoint */
+    error = vfs_valloc(&margs->vp_res, VTYPE_DIR, 0);
+    if (error < 0) {
+        return error;
+    }
+
+    vp = margs->vp_res;
+    vp->vops = &tmpfs_vops;
+    return 0;
+}
+
+/*
+ * Write to the filesystem
+ */
+static ssize_t
+tmpfs_write(struct vop_rw_data *data)
+{
+    struct vnode *vp;
+    struct tmpfs_node *np;
+    char *dest;
+    void *p;
+    size_t node_len, len;
+    size_t overflow_window;
+
+    if (data == NULL) {
+        return -EINVAL;
+    }
+
+    if ((vp = data->vp) == NULL) {
+        return -EIO;
+    }
+
+    /* We need the vnode for lengths */
+    if ((np = vp->data) == NULL) {
+        return -EIO;
+    }
+
+    /*
+     * Check if there is going to be any overflows
+     * and if so, get the overflow window and expand
+     * the buffer by it.
+     */
+    len = data->len;
+    if ((len + data->off) > np->len) {
+        overflow_window = (len + data->off) - np->len;
+        np->len += overflow_window + 1;
+
+        p = np->data;
+        np->data = krealloc(np->data, np->len);
+        if (np->data == NULL) {
+            np->data = p;
+            return -ENOMEM;
+        }
+    }
+
+    np->real_len += len;
+    node_len = np->len;
+    dest = np->data + data->off;
+    memcpy(dest, data->data, len);
+    return len;
+}
+
+static ssize_t
+tmpfs_read(struct vop_rw_data *data)
+{
+    struct vnode *vp;
+    struct tmpfs_node *np;
+    size_t len;
+    char *dest, *src;
+
+    if (data == NULL) {
+        return -1;
+    }
+
+    if ((vp = data->vp) == NULL) {
+        return -EIO;
+    }
+
+    if ((np = vp->data) == NULL) {
+        return -EIO;
+    }
+
+    /* Return EOF if the offset is too far */
+    len = data->len;
+    if (data->off >= np->real_len) {
+        return 0;   /* EOF */
+    }
+
+    /* Is there any data to read? */
+    if ((len + data->off) > np->len) {
+        len = np->len;
+    }
+    if (len == 0) {
+        return 0;
+    }
+
+    dest = data->data;
+    src = np->data + data->off;
+    memcpy(dest, src, len);
+    return len;
+}
+
+static int
+tmpfs_getattr(struct vnode *vp, struct vattr *res)
+{
+    struct tmpfs_node *np;
+
+    if (vp == NULL || res == NULL) {
+        return -EINVAL;
+    }
+
+    if ((np = vp->data) == NULL) {
+        return -EIO;
+    }
+
+    res->size = np->real_len;
+    return 0;
+}
+
+static int
+tmpfs_reclaim(struct vnode *vp, int flags)
+{
+    return 0;
+}
+
+static struct vop tmpfs_vops = {
+    .lookup = tmpfs_lookup,
+    .create = tmpfs_create,
+    .reclaim = tmpfs_reclaim,
+    .write = tmpfs_write,
+    .read = tmpfs_read,
+    .getattr = tmpfs_getattr
+};
+
+struct vfsops g_tmpfs_vfsops = {
+    .init = tmpfs_init,
+    .mount = tmpfs_mount,
+};
diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index a031872..42dc4c0 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -73,6 +73,11 @@ scret_t sys_read(struct syscall_args *scargs);
  */
 scret_t sys_close(struct syscall_args *scargs);
 
+/*
+ * Seek a file descriptor
+ */
+scret_t sys_lseek(struct syscall_args *scargs);
+
 #ifdef _NEED_UNIX_SCTAB
 scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_none]   = NULL,
@@ -89,7 +94,8 @@ scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_waitpid] = sys_waitpid,
     [SYS_dmsio] = sys_dmsio,
     [SYS_read] = sys_read,
-    [SYS_close] = sys_close
+    [SYS_close] = sys_close,
+    [SYS_lseek] = sys_lseek
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h
index a6a2ac5..b773de9 100644
--- a/src/sys/include/os/filedesc.h
+++ b/src/sys/include/os/filedesc.h
@@ -30,6 +30,7 @@
 #ifndef _OS_FILEDESC_H_
 #define _OS_FILEDESC_H_ 1
 
+#include <sys/seek.h>
 #include <sys/types.h>
 #include <os/vnode.h>
 
@@ -117,4 +118,13 @@ ssize_t write(int fd, const void *buf, size_t count);
  */
 ssize_t read(int fd, void *buf, size_t count);
 
+/*
+ * Reposition the file offset of a file
+ *
+ * @fd: File descriptor to reposition
+ * @offset: Offset to move `fd' to
+ * @whence: How it should be repositioned
+ */
+off_t lseek(int fd, off_t offset, int whence);
+
 #endif  /* !_OS_FILEDESC_H_ */
diff --git a/src/sys/include/os/kalloc.h b/src/sys/include/os/kalloc.h
index 143c4f9..aaaaa74 100644
--- a/src/sys/include/os/kalloc.h
+++ b/src/sys/include/os/kalloc.h
@@ -48,6 +48,14 @@
 void *kalloc(size_t sz);
 
 /*
+ * Reallocates memory pool created by `dynalloc()'
+ *
+ * @old_ptr: Pointer to old pool.
+ * @newsize: Size of new pool.
+ */
+void *krealloc(void *old_ptr, size_t newsize);
+
+/*
  * Free a chunk of memory given to by
  * `ptr'
  *
diff --git a/src/sys/include/os/vnode.h b/src/sys/include/os/vnode.h
index 1bef1e2..77cadb2 100644
--- a/src/sys/include/os/vnode.h
+++ b/src/sys/include/os/vnode.h
@@ -32,6 +32,7 @@
 
 #include <sys/types.h>
 #include <sys/atomic.h>
+#include <sys/namei.h>
 
 /* Forward declarations */
 struct vnode;
@@ -83,12 +84,33 @@ struct vop_rw_data {
 };
 
 /*
+ * Arguments to create an entry within a
+ * filesystem
+ *
+ * @ndp: Path component to create
+ */
+struct vop_create_args {
+    struct nameidata *ndp;
+};
+
+/*
+ * Represents attributes of a vnode
+ *
+ * @size: File size in bytes
+ */
+struct vattr {
+    size_t size;
+};
+
+/*
  * Represents operations that can be performed on
  * a specific vnode. These are implemented as callbacks
  */
 struct vop {
+    int(*getattr)(struct vnode *vp, struct vattr *res);
     int(*lookup)(struct vop_lookup_args *args);
     int(*reclaim)(struct vnode *vp, int flags);
+    int(*create)(struct vop_create_args *args);
     ssize_t(*write)(struct vop_rw_data *data);
     ssize_t(*read)(struct vop_rw_data *data);
 };
@@ -176,4 +198,27 @@ ssize_t vop_read(struct vnode *vp, char *data, off_t off, size_t len);
  */
 int vop_reclaim(struct vnode *vp, int flags);
 
+/*
+ * Create a node within a specific filesystem or
+ * directory
+ *
+ * @vp: Vnode of parent directory
+ * @ndp: Namei descriptor of path component
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value on failure.
+ */
+int vop_create(struct vnode *vp, struct nameidata *ndp);
+
+/*
+ * Get the attributes of a file
+ *
+ * @vp: Vnode of file to get attributes of
+ * @res: Result of file to get attr of
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int vop_getattr(struct vnode *vp, struct vattr *res);
+
 #endif  /* !_OS_VNODE_H_ */
diff --git a/src/sys/include/sys/fcntl.h b/src/sys/include/sys/fcntl.h
index 30d2ec4..1ab3e71 100644
--- a/src/sys/include/sys/fcntl.h
+++ b/src/sys/include/sys/fcntl.h
@@ -43,6 +43,7 @@
 #define O_RDONLY    0x00
 #define O_RDWR      BIT(1)
 #define O_WRONLY    BIT(2)
+#define O_CREAT     BIT(3)
 
 /* File access mode flags */
 #define O_ACCMODE (O_RDWR | O_WRONLY)
diff --git a/src/sys/include/sys/mount.h b/src/sys/include/sys/mount.h
index 6d041ee..5f6fa6b 100644
--- a/src/sys/include/sys/mount.h
+++ b/src/sys/include/sys/mount.h
@@ -42,6 +42,7 @@
  */
 #define MOUNT_INITRD "initrd"   /* Initial ramdisk */
 #define MOUNT_DEVFS  "devfs"    /* Device filesystem */
+#define MOUNT_TMPFS  "tmpfs"    /* Temporary filesystem */
 
 /*
  * The mount system call
@@ -65,7 +66,8 @@ struct mount;
 
 /* Filesystem vfsops */
 extern struct vfsops g_omar_vfsops;
-extern struct vfsops g_devfs_vfops;
+extern struct vfsops g_devfs_vfsops;
+extern struct vfsops g_tmpfs_vfsops;
 
 /*
  * Represents a mountpoint
@@ -133,7 +135,6 @@ struct fs_info {
  */
 #define FS_ATTR_IMAGE BIT(0)    /* Is an image kind e.g., OSMORA OMAR */
 
-
 /*
  * VFS operations vector
  *
diff --git a/src/sys/include/sys/namei.h b/src/sys/include/sys/namei.h
index 58307b1..9e78a4c 100644
--- a/src/sys/include/sys/namei.h
+++ b/src/sys/include/sys/namei.h
@@ -32,6 +32,8 @@
 
 #include <os/vnode.h>
 
+#define NAMEI_CREATE BIT(0)     /* Create as we go */
+
 /*
  * Represents namei data that can be used for
  * looking up files
diff --git a/src/sys/include/sys/seek.h b/src/sys/include/sys/seek.h
new file mode 100644
index 0000000..1edc50b
--- /dev/null
+++ b/src/sys/include/sys/seek.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_SEEK_H_
+#define _SYS_SEEK_H_ 1
+
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+#endif  /* !_SYS_SEEK_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index 77b7505..c97d5ea 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -58,6 +58,7 @@
 #define SYS_dmsio       0x0D    /* DMS I/O */
 #define SYS_read        0x0E    /* read a file descriptor */
 #define SYS_close       0x0F    /* close a file */
+#define SYS_lseek       0x10    /* seek to end of file */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;
diff --git a/src/sys/os/os_filedes.c b/src/sys/os/os_filedes.c
index 95452af..36748a6 100644
--- a/src/sys/os/os_filedes.c
+++ b/src/sys/os/os_filedes.c
@@ -160,8 +160,10 @@ fd_open(const char *path, mode_t mode)
 {
     struct filedesc *fd;
     struct nameidata nd;
+    struct vop_create_args creat_args;
     struct proc *self = proc_self();
     struct vnode *vp;
+    uint32_t namei_flags = 0;
     int error;
 
     /* We need the current proc */
@@ -180,12 +182,21 @@ fd_open(const char *path, mode_t mode)
     }
 
     /*
+     * If we are creating a new file, we'll need to
+     * get the parent vnode so that we can use the
+     * create vop.
+     */
+    if (ISSET(mode, O_CREAT)) {
+        namei_flags |= NAMEI_CREATE;
+    }
+
+    /*
      * Now we try to do the lookup, we'll need
      * the vnode for file references to be
      * useful
      */
     nd.path = path;
-    nd.flags = 0;
+    nd.flags = namei_flags;
     nd.vp_res = &vp;
     error = namei(&nd);
     if (error < 0) {
@@ -348,6 +359,44 @@ read(int fd, void *buf, size_t count)
     return retval;
 }
 
+off_t
+lseek(int fd, off_t offset, int whence)
+{
+    struct filedesc *fdp;
+    struct proc *self = proc_self();
+    struct vattr attr;
+    int error;
+
+    if (fd < 0) {
+        return -EBADF;
+    }
+
+    fdp = fd_get(self, fd);
+    if (fdp == NULL) {
+        return -EBADF;
+    }
+
+    /* Could not get vnode attributes */
+    error = vop_getattr(fdp->vp, &attr);
+    if (error < 0) {
+        return 0;
+    }
+
+    switch (whence) {
+    case SEEK_SET:
+        fdp->off = offset;
+        break;
+    case SEEK_CUR:
+        fdp->off += offset;
+        break;
+    case SEEK_END:
+        fdp->off = attr.size;
+        break;
+    }
+
+    return fdp->off;
+}
+
 /*
  * ARG0: Path
  * ARG1: Mode
@@ -367,3 +416,18 @@ sys_open(struct syscall_args *scargs)
 
     return fd_open(pathbuf, mode);
 }
+
+/*
+ * ARG0: Fd
+ * ARG1: Offset
+ * ARG2: Whence
+ */
+scret_t
+sys_lseek(struct syscall_args *scargs)
+{
+    int fd = SCARG(scargs, int, 0);
+    off_t off = SCARG(scargs, off_t, 1);
+    int whence = SCARG(scargs, int, 2);
+
+    return lseek(fd, off, whence);
+}
diff --git a/src/sys/os/os_kalloc.c b/src/sys/os/os_kalloc.c
index 53e2e13..a5e48e5 100644
--- a/src/sys/os/os_kalloc.c
+++ b/src/sys/os/os_kalloc.c
@@ -64,6 +64,17 @@ kalloc(size_t sz)
     return tmp;
 }
 
+void *
+krealloc(void *old_ptr, size_t newsize)
+{
+    void *tmp;
+
+    spinlock_acquire(&lock);
+    tmp = tlsf_realloc(tlsf_ctx, old_ptr, newsize);
+    spinlock_release(&lock);
+    return tmp;
+}
+
 /*
  * Memory deallocation
  */
diff --git a/src/sys/os/vfs_init.c b/src/sys/os/vfs_init.c
index 80d8559..1b6f815 100644
--- a/src/sys/os/vfs_init.c
+++ b/src/sys/os/vfs_init.c
@@ -39,7 +39,8 @@
  */
 static struct fs_info fstab[] = {
     { MOUNT_INITRD, &g_omar_vfsops, 0 },
-    { MOUNT_DEVFS, &g_devfs_vfops, 0 }
+    { MOUNT_DEVFS, &g_devfs_vfsops, 0 },
+    { MOUNT_TMPFS, &g_tmpfs_vfsops, 0 }
 };
 
 /*
diff --git a/src/sys/os/vfs_namei.c b/src/sys/os/vfs_namei.c
index 1425c30..d417db8 100644
--- a/src/sys/os/vfs_namei.c
+++ b/src/sys/os/vfs_namei.c
@@ -46,10 +46,13 @@ namei(struct nameidata *ndp)
     struct vnode *vp;
     struct vop *vops;
     struct vop_lookup_args lookup;
+    struct vop_create_args create;
+    struct nameidata nd_create;
     struct fs_info *fip;
     char namebuf[NAME_MAX];
+    size_t root_len;
     const char *p, *pcur;
-    size_t len, i = 0;
+    size_t i = 0;
     int error;
 
     if (ndp == NULL) {
@@ -61,23 +64,35 @@ namei(struct nameidata *ndp)
         return -EINVAL;
     }
 
-    error = mount_lookup("/", &mp);
+    /* Get rid of leading slashes */
+    pcur = p;
+    while (*pcur == '/') {
+        ++pcur;
+    }
+
+    /* Wait until we get the '/' */
+    while (*pcur != '/' && *pcur != '\0') {
+        ++pcur;
+    }
+
+    /* Copy the root path e.g., /tmp */
+    root_len = (size_t)(pcur - p);
+    memcpy(namebuf, p, root_len);
+    error = mount_lookup(namebuf, &mp);
+
     if (error < 0) {
-        printf("namei: failed to get rootfs\n");
+        error = mount_lookup("/", &mp);
+    }
+    if (error < 0) {
+        printf("namei: could not get mount %s\n", namebuf);
         return error;
     }
 
-    vp = mp->vp;
     fip = mp->fs;
-
-    if ((vops = vp->vops) == NULL) {
-        printf("namei: failed to get vops\n");
+    if ((vp = mp->vp) == NULL) {
         return -EIO;
     }
-
-    /* We need vops->lookup() */
-    if (vops->lookup == NULL) {
-        printf("namei: vops does not have lookup op\n");
+    if ((vops = vp->vops) == NULL) {
         return -EIO;
     }
 
@@ -101,10 +116,7 @@ namei(struct nameidata *ndp)
         }
     }
 
-    printf("namei: f: %s\n", ndp->path);
-    printf("namei: d: /\n", ndp->path);
 
-    pcur = p;
     while (*pcur != '\0') {
         /* Get out of the slashes */
         while (*pcur == '/')
@@ -123,7 +135,35 @@ namei(struct nameidata *ndp)
         }
 
         i = 0;
-        printf("namei: n %s\n", namebuf);
+
+        /* Get the vops */
+        vp = mp->vp;
+        if ((vops = vp->vops) == NULL) {
+            return -EIO;
+        }
+
+        /* Create as we go? */
+        if (ISSET(ndp->flags, NAMEI_CREATE)) {
+            if (vops->create == NULL)
+                return -EIO;
+
+            nd_create.path = namebuf;
+            create.ndp = &nd_create;
+            error = vops->create(&create);
+            if (error < 0)
+                return error;
+        }
+
+        /* Do the lookup */
+        lookup.dirvp = vp;
+        lookup.vpp = &vp;
+        lookup.name = namebuf;
+        error = vops->lookup(&lookup);
+        if (error < 0) {
+            return -ENOENT;
+        }
     }
-    return -ENOENT;
+
+    *ndp->vp_res = vp;
+    return 0;
 }
diff --git a/src/sys/os/vfs_subr.c b/src/sys/os/vfs_subr.c
index 6cb7767..2ae18af 100644
--- a/src/sys/os/vfs_subr.c
+++ b/src/sys/os/vfs_subr.c
@@ -224,3 +224,45 @@ vop_reclaim(struct vnode *vp, int flags)
 
     return vops->reclaim(vp, flags);
 }
+
+int
+vop_create(struct vnode *vp, struct nameidata *ndp)
+{
+    struct vop *vops;
+    struct vop_create_args args;
+
+    if (vp == NULL || ndp == NULL) {
+        return -EINVAL;
+    }
+
+    if ((vops = vp->vops) == NULL) {
+        return -EIO;
+    }
+
+    if (vops->create == NULL) {
+        return -EIO;
+    }
+
+    args.ndp = ndp;
+    return vops->create(&args);
+}
+
+int
+vop_getattr(struct vnode *vp, struct vattr *res)
+{
+    struct vop *vops;
+
+    if (vp == NULL || res == NULL) {
+        return -EINVAL;
+    }
+
+    if ((vops = vp->vops) == NULL) {
+        return -EIO;
+    }
+
+    if (vops->getattr == NULL) {
+        return -EIO;
+    }
+
+    return vops->getattr(vp, res);
+}