diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index f36fa61cabf49..a2e2dd75bd984 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -354,12 +354,21 @@ extern {
     pub fn kqueue() -> ::c_int;
     pub fn unmount(target: *const ::c_char, arg: ::c_int) -> ::c_int;
     pub fn syscall(num: ::c_int, ...) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam_r50")]
+    pub fn getpwnam_r(name: *const ::c_char,
+                      pwd: *mut passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut passwd) -> ::c_int;
     #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid_r50")]
     pub fn getpwuid_r(uid: ::uid_t,
                       pwd: *mut passwd,
                       buf: *mut ::c_char,
                       buflen: ::size_t,
                       result: *mut *mut passwd) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwent50")]
+    pub fn getpwent() -> *mut passwd;
+    pub fn setpwent();
     pub fn getprogname() -> *const ::c_char;
     pub fn setprogname(name: *const ::c_char);
     pub fn getloadavg(loadavg: *mut ::c_double, nelem: ::c_int) -> ::c_int;
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 314219e78cbe3..d2ae4eaeb0578 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -17,6 +17,13 @@ pub enum DIR {}
 pub enum locale_t {}
 
 s! {
+    pub struct group {
+        pub gr_name: *mut ::c_char,
+        pub gr_passwd: *mut ::c_char,
+        pub gr_gid: ::gid_t,
+        pub gr_mem: *mut *mut ::c_char,
+    }
+
     pub struct utimbuf {
         pub actime: time_t,
         pub modtime: time_t,
@@ -226,6 +233,15 @@ cfg_if! {
 }
 
 extern {
+    pub fn getgrnam(name: *const ::c_char) -> *mut group;
+    pub fn getgrgid(gid: ::gid_t) -> *mut group;
+
+    pub fn endpwent();
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam50")]
+    pub fn getpwnam(name: *const ::c_char) -> *mut passwd;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid50")]
+    pub fn getpwuid(uid: ::uid_t) -> *mut passwd;
+
     pub fn fprintf(stream: *mut ::FILE,
                    format: *const ::c_char, ...) -> ::c_int;
     pub fn printf(format: *const ::c_char, ...) -> ::c_int;
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index 25007fbdf9b42..a909082a5ae48 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -503,6 +503,8 @@ f! {
 }
 
 extern {
+    pub fn setpwent();
+    pub fn getpwent() -> *mut passwd;
     pub fn shm_open(name: *const c_char, oflag: ::c_int,
                     mode: mode_t) -> ::c_int;
     pub fn shmget(key: ::key_t, size: ::size_t, shmflg: ::c_int) -> ::c_int;
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index d625f1b721517..8280141961d1e 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -715,6 +715,11 @@ f! {
 }
 
 extern {
+    pub fn getpwnam_r(name: *const ::c_char,
+                      pwd: *mut passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut passwd) -> ::c_int;
     pub fn getpwuid_r(uid: ::uid_t,
                       pwd: *mut passwd,
                       buf: *mut ::c_char,
diff --git a/src/unix/solaris/mod.rs b/src/unix/solaris/mod.rs
index 5a31e5269bbb3..047051ef6dc5b 100644
--- a/src/unix/solaris/mod.rs
+++ b/src/unix/solaris/mod.rs
@@ -966,10 +966,16 @@ extern {
                        serv: *mut ::c_char,
                        sevlen: ::socklen_t,
                        flags: ::c_int) -> ::c_int;
+    pub fn getpwnam_r(name: *const ::c_char,
+                      pwd: *mut passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::c_int) -> *const passwd;
     pub fn getpwuid_r(uid: ::uid_t,
                       pwd: *mut passwd,
                       buf: *mut ::c_char,
-                      buflen: ::size_t) -> *const passwd;
+                      buflen: ::c_int) -> *const passwd;
+    pub fn setpwent();
+    pub fn getpwent() -> *mut passwd;
     pub fn readdir(dirp: *mut ::DIR) -> *const ::dirent;
     pub fn fdatasync(fd: ::c_int) -> ::c_int;
     pub fn nl_langinfo_l(item: ::nl_item, locale: ::locale_t) -> *mut ::c_char;