diff --git a/include/sched.h b/include/sched.h
index 9062772..3df4c7b 100644
--- a/include/sched.h
+++ b/include/sched.h
@@ -59,6 +59,7 @@ int     sched_yield(void);
 #define CLONE_IO	0x80000000
 int clone (int (*)(void *), void *, int, void *, ...);
 int unshare(int);
+int setns(int, int);
 #endif
 
 #ifdef __cplusplus
diff --git a/include/sys/socket.h b/include/sys/socket.h
index 7024d23..4d64336 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -259,6 +259,10 @@ int sockatmark (int);
 #define SHUT_WR 1
 #define SHUT_RDWR 2
 
+#ifdef _GNU_SOURCE
+int accept4(int, struct sockaddr *__restrict, socklen_t *__restrict, int);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/unistd.h b/include/unistd.h
index b5206a6..4f6953c 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -171,6 +171,7 @@ int daemon(int, int);
 void setusershell(void);
 void endusershell(void);
 char *getusershell(void);
+int acct(const char *);
 #endif
 
 #ifdef _GNU_SOURCE
@@ -181,6 +182,7 @@ int getresuid(uid_t *, uid_t *, uid_t *);
 int getresgid(gid_t *, gid_t *, gid_t *);
 char *get_current_dir_name(void);
 int pipe2(int [2], int);
+int dup3(int, int, int);
 #endif
 
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
diff --git a/src/linux/accept4.c b/src/linux/accept4.c
new file mode 100644
index 0000000..91db284
--- /dev/null
+++ b/src/linux/accept4.c
@@ -0,0 +1,9 @@
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include "syscall.h"
+#include "libc.h"
+
+int accept4(int fd, struct sockaddr *restrict addr, socklen_t *restrict len, int flg)
+{
+        return syscall(SYS_accept4, fd, addr, len, flg);
+}
diff --git a/src/linux/dup3.c b/src/linux/dup3.c
new file mode 100644
index 0000000..e201ef0
--- /dev/null
+++ b/src/linux/dup3.c
@@ -0,0 +1,10 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <errno.h>
+#include "syscall.h"
+
+int dup3(int old, int new, int flags) {
+        int r;
+        while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
+        return __syscall_ret(r);
+}
diff --git a/src/linux/setns.c b/src/linux/setns.c
new file mode 100644
index 0000000..af3eb09
--- /dev/null
+++ b/src/linux/setns.c
@@ -0,0 +1,9 @@
+#define _GNU_SOURCE
+#include <sched.h>
+#include "syscall.h"
+#include "libc.h"
+
+int setns(int fd, int nstype)
+{
+        return syscall(SYS_setns, fd, nstype);
+}
diff --git a/src/unistd/acct.c b/src/unistd/acct.c
new file mode 100644
index 0000000..9384712
--- /dev/null
+++ b/src/unistd/acct.c
@@ -0,0 +1,9 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include "syscall.h"
+#include "libc.h"
+
+int acct(const char *filename)
+{
+        return syscall(SYS_acct, filename);
+}