17 files changed, 366 insertions, 4 deletions
diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index a031872..5df3c51 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -31,12 +31,15 @@
 #define _UNIX_SYSCALL_H_ 1
 
 #include <sys/proc.h>
+#include <sys/socket.h>
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <sys/syscall.h>
+#include <os/ucred.h>
 #include <os/iotap.h>
 #include <os/reboot.h>
 #include <dms/dms.h>
+#include <vm/map.h>
 
 /*
  * Exit the current process - exit(2) syscall
@@ -73,6 +76,11 @@ 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 +97,12 @@ 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,
+    [SYS_socket] = sys_socket,
+    [SYS_listen] = sys_listen,
+    [SYS_seteuid] = sys_seteuid,
+    [SYS_mmap] = sys_mmap
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/fs/devfs.h b/src/sys/include/fs/devfs.h
index ea96cdd..68c910f 100644
--- a/src/sys/include/fs/devfs.h
+++ b/src/sys/include/fs/devfs.h
@@ -45,6 +45,7 @@ struct devfs_node;
 struct dev_iobuf {
     void *buf;
     size_t count;
+    off_t off;
 };
 
 /*
diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h
index a6a2ac5..95400ed 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>
 
@@ -51,6 +52,18 @@ struct filedesc {
 };
 
 /*
+ * Allocate a file descriptor from a specific process's
+ * file descriptor table
+ *
+ * @procp: Process to allocate fd from
+ * @fd_res: Result pointer is written here
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value upon failure
+ */
+int fd_alloc(struct proc *procp, struct filedesc **fd_res);
+
+/*
  * Duplicate a file descriptor
  *
  * @procp: Process to duplicate from
@@ -62,6 +75,18 @@ struct filedesc {
 struct filedesc *fd_dup(struct proc *procp, int fd);
 
 /*
+ * Look up a file descriptor that belongs to a specific
+ * process by using its fd number
+ *
+ * @procp: Process to look up
+ * @fd: File descriptor number
+ *
+ * Returns the file descriptor pointer on success,
+ * otherwise a less than zero value on failure
+ */
+struct filedesc *fd_get(struct proc *procp, int fd);
+
+/*
  * Initialize a process file descriptor table
  * and set up standard streams
  *
@@ -117,4 +142,13 @@ 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/ucred.h b/src/sys/include/os/ucred.h
new file mode 100644
index 0000000..6e3e4b4
--- /dev/null
+++ b/src/sys/include/os/ucred.h
@@ -0,0 +1,61 @@
+/*
+ * 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 _OS_UCRED_H_
+#define _OS_UCRED_H_ 1
+
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/ucred.h>
+#include <sys/proc.h>
+
+/*
+ * Initialize user credientials
+ *
+ * @proc: Current process
+ * @cred: credientials to initialize
+ *
+ * XXX: 'proc' being NULL drops the creds to root
+ *
+ * Returns zero on success, otherwise a less
+ * than zero value on failure.
+ */
+int ucred_init(struct proc *proc, struct ucred *cred);
+
+/*
+ * Set effective user ID
+ */
+int seteuid(uid_t euid);
+
+/*
+ * Set EUID system call
+ */
+scret_t sys_seteuid(struct syscall_args *scargs);
+
+#endif  /* !_OS_UCRED_H_ */
diff --git a/src/sys/include/os/vnode.h b/src/sys/include/os/vnode.h
index 1bef1e2..9d8a3e6 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;
@@ -43,12 +44,16 @@ struct vop;
  * @VTYPE_NONE: Vnode is yet to be assigned a type
  * @VTYPE_FILE: Vnode references a file
  * @VTYPE_DIR:  Vnode references a directory
+ * @VTYPE_SOCK: Vnode references a socket
+ * @VTYPE_CDEV: Vnode references a character device
  * @__N_VTYPE:  Number of valid nodes on the system
  */
 typedef enum {
     VTYPE_NONE,
     VTYPE_FILE,
     VTYPE_DIR,
+    VTYPE_SOCK,
+    VTYPE_CDEV,
     __N_VTYPE
 } vtype_t;
 
@@ -83,12 +88,35 @@ struct vop_rw_data {
 };
 
 /*
+ * Arguments to create an entry within a
+ * filesystem
+ *
+ * @ndp: Path component to create
+ * @vtype: Vnode type
+ */
+struct vop_create_args {
+    struct nameidata *ndp;
+    vtype_t vtype;
+};
+
+/*
+ * 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 +204,28 @@ 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
+ * @type: Vnode type to create with
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value on failure.
+ */
+int vop_create(struct vnode *vp, struct nameidata *ndp, vtype_t type);
+
+/*
+ * 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/mman.h b/src/sys/include/sys/mman.h
index 7ae1ed2..0ad4959 100644
--- a/src/sys/include/sys/mman.h
+++ b/src/sys/include/sys/mman.h
@@ -30,7 +30,11 @@
 #ifndef _SYS_MMAN_H_
 #define _SYS_MMAN_H_ 1
 
+#include <sys/types.h>
 #include <sys/param.h>
+#if !defined(_KERNEL)
+#include <stddef.h>
+#endif  /* !_KERNEL */
 
 #define PROT_READ   BIT(0)
 #define PROT_WRITE  BIT(1)
@@ -39,4 +43,9 @@
 #define PROT_USER   BIT(3)
 #endif  /* _KERNEL */
 
+/*
+ * Map memory pages
+ */
+void *mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
+
 #endif  /* !_SYS_MMAN_H_ */
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/proc.h b/src/sys/include/sys/proc.h
index a547233..b188d50 100644
--- a/src/sys/include/sys/proc.h
+++ b/src/sys/include/sys/proc.h
@@ -30,6 +30,7 @@
 #ifndef _SYS_PROC_H_
 #define _SYS_PROC_H_
 
+#include <sys/ucred.h>
 #include <sys/types.h>
 #include <sys/syscall.h>
 #include <sys/cdefs.h>
@@ -91,6 +92,7 @@ struct proc {
     struct penv_blk *envblk;
     struct ptrbox *envblk_box;
     struct proc *parent;
+    struct ucred cred;
     mac_level_t level;
     struct spinlock maplist_lock;
     sigtab_t sigtab;
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/socket.h b/src/sys/include/sys/socket.h
new file mode 100644
index 0000000..0ca041f
--- /dev/null
+++ b/src/sys/include/sys/socket.h
@@ -0,0 +1,83 @@
+/*
+ * 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_SOCKET_H_
+#define _SYS_SOCKET_H_ 1
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+/* Address family defines */
+#define AF_UNIX     0x00        /* Local comms / IPC */
+#define AF_LOCAL    AF_UNIX     /* AF_UNIX alias */
+
+/* Socket type defines */
+#define SOCK_STREAM  0x00
+#define SOCK_DGRAM   0x01
+
+/*
+ * Get a socket as a file descriptor
+ *
+ * @domain: Socket domain (AF_*)
+ * @type: Socket type SOCK_*
+ *
+ * Returns file descriptor on success, otherwise
+ * a less than zero value on failure
+ */
+int socket(int domain, int type, int protocol);
+
+/*
+ * @socket: Socket to listen on
+ * @backlog: Max connections
+ */
+int listen(int socket, int backlog);
+
+#if defined(_KERNEL)
+
+/*
+ * Kernel representation of a socket
+ *
+ * @backlog: Maximum connections (< 0 means socket not active)
+ */
+struct ksocket {
+    int backlog;
+};
+
+/*
+ * Socket syscall
+ */
+scret_t sys_socket(struct syscall_args *scargs);
+
+/*
+ * Listen syscall
+ */
+scret_t sys_listen(struct syscall_args *scargs);
+
+#endif  /* _KERNEL */
+#endif  /* !_SYS_SOCKET_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index 77b7505..ee6ef48 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -58,6 +58,11 @@
 #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 */
+#define SYS_socket      0x11    /* get a socket fd */
+#define SYS_listen      0x12    /* listen on a socket */
+#define SYS_seteuid     0x13    /* set effective UID */
+#define SYS_mmap        0x14    /* map a virtual address */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;
diff --git a/src/sys/include/sys/types.h b/src/sys/include/sys/types.h
index b1d5994..745eed7 100644
--- a/src/sys/include/sys/types.h
+++ b/src/sys/include/sys/types.h
@@ -96,7 +96,6 @@ typedef __size_t uintptr_t;
 typedef __size_t off_t;
 typedef int pid_t;
 typedef int dev_t;
-typedef __uint32_t uid_t;
 typedef __uint32_t mode_t;
 typedef __uint32_t ino_t;
 typedef __uint32_t nlink_t;
diff --git a/src/sys/include/sys/ucred.h b/src/sys/include/sys/ucred.h
new file mode 100644
index 0000000..ab44b6c
--- /dev/null
+++ b/src/sys/include/sys/ucred.h
@@ -0,0 +1,48 @@
+/*
+ * 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_UCRED_H_
+#define _SYS_UCRED_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * Represents current user credientials
+ *
+ * @euid: Effective user ID
+ * @ruid: Real user ID
+ * @suid: Saved UID
+ */
+struct ucred {
+    uid_t euid;
+    uid_t ruid;
+    uid_t suid;
+};
+
+#endif  /* !_SYS_UCRED_H_ */
diff --git a/src/sys/include/vm/map.h b/src/sys/include/vm/map.h
index 69d7d73..8183b62 100644
--- a/src/sys/include/vm/map.h
+++ b/src/sys/include/vm/map.h
@@ -31,6 +31,7 @@
 #define _VM_MAP_H_  1
 
 #include <sys/types.h>
+#include <sys/syscall.h>
 #include <sys/mman.h>
 #include <machine/vas.h>    /* standard */
 #include <vm/mmu.h>
@@ -52,4 +53,9 @@
  */
 int vm_map(struct vm_vas *vas, struct mmu_map *spec, size_t len, int prot);
 
+/*
+ * POSIX mmap syscall
+ */
+scret_t sys_mmap(struct syscall_args *scargs);
+
 #endif  /* !_VM_MAP_H_ */