diff --git a/src/stat/fchmod.c b/src/stat/fchmod.c
index f9b99366e4790b01b1f94f460e657fc9439cd9cc..1b943d440c547dfd81e7269e9d70710bdefc2770 100644
--- a/src/stat/fchmod.c
+++ b/src/stat/fchmod.c
@@ -1,7 +1,15 @@
 #include <sys/stat.h>
+#include <errno.h>
 #include "syscall.h"
 
+void __procfdname(char *, unsigned);
+
 int fchmod(int fd, mode_t mode)
 {
-	return syscall(SYS_fchmod, fd, mode);
+	int ret = __syscall(SYS_fchmod, fd, mode);
+	if (ret != -EBADF || fd < 0) return __syscall_ret(ret);
+
+	char buf[15+3*sizeof(int)];
+	__procfdname(buf, fd);
+	return syscall(SYS_chmod, buf, mode);
 }
diff --git a/src/stat/fstat.c b/src/stat/fstat.c
index 10228f75240c9b38dfadc101125cc03f07780697..29b4243db37307c27c65601ef84fa16177ef669f 100644
--- a/src/stat/fstat.c
+++ b/src/stat/fstat.c
@@ -1,10 +1,18 @@
 #include <sys/stat.h>
+#include <errno.h>
 #include "syscall.h"
 #include "libc.h"
 
-int fstat(int fd, struct stat *buf)
+void __procfdname(char *, unsigned);
+
+int fstat(int fd, struct stat *st)
 {
-	return syscall(SYS_fstat, fd, buf);
+	int ret = __syscall(SYS_fstat, fd, st);
+	if (ret != -EBADF || fd < 0) return __syscall_ret(ret);
+
+	char buf[15+3*sizeof(int)];
+	__procfdname(buf, fd);
+	return syscall(SYS_stat, buf, st);
 }
 
 LFS64(fstat);
diff --git a/src/unistd/fchdir.c b/src/unistd/fchdir.c
index e5595f7749f35f0d959da1fc186e6361e648e90d..9fbc815429e43973311b3cab56ab298224ec1b0a 100644
--- a/src/unistd/fchdir.c
+++ b/src/unistd/fchdir.c
@@ -1,7 +1,15 @@
 #include <unistd.h>
+#include <errno.h>
 #include "syscall.h"
 
+void __procfdname(char *, unsigned);
+
 int fchdir(int fd)
 {
-	return syscall(SYS_fchdir, fd);
+	int ret = __syscall(SYS_fchdir, fd);
+	if (ret != -EBADF || fd < 0) return __syscall_ret(ret);
+
+	char buf[15+3*sizeof(int)];
+	__procfdname(buf, fd);
+	return syscall(SYS_chdir, buf);
 }
diff --git a/src/unistd/fchown.c b/src/unistd/fchown.c
index b05f0be41d9dae32dfd6c82ba96c364fd2606eaf..e1c3198a738cd2cb46f52f13f78892b81b6ab483 100644
--- a/src/unistd/fchown.c
+++ b/src/unistd/fchown.c
@@ -1,7 +1,15 @@
 #include <unistd.h>
+#include <errno.h>
 #include "syscall.h"
 
+void __procfdname(char *, unsigned);
+
 int fchown(int fd, uid_t uid, gid_t gid)
 {
-	return syscall(SYS_fchown, fd, uid, gid);
+	int ret = __syscall(SYS_fchown, fd, uid, gid);
+	if (ret != -EBADF || fd < 0) return __syscall_ret(ret);
+
+	char buf[15+3*sizeof(int)];
+	__procfdname(buf, fd);
+	return syscall(SYS_chown, buf, uid, gid);
 }