Auto merge of #934 - ctrlcctrlv:master, r=alexcrichton

Add passwd/group APIs needed for nix-rust/nix#864

Hope I did this right. I only added platforms I could personally test. . .

cc: @gnzlbg

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "libc"
-version = "0.2.37"
+version = "0.2.38"
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"

libc-test/build.rs

@@ -664,6 +664,9 @@ fn main() {
             // the symbol.
             "uname" if freebsd => true,
 
+            // FIXME: need to upgrade FreeBSD version; see https://github.com/rust-lang/libc/issues/938
+            "setgrent" if freebsd => true,
+
             // aio_waitcomplete's return type changed between FreeBSD 10 and 11.
             "aio_waitcomplete" if freebsd => true,
 

src/unix/bsd/mod.rs

@@ -388,6 +388,10 @@ extern {
     pub fn getpwent() -> *mut passwd;
     pub fn setpwent();
     pub fn endpwent();
+    pub fn setgrent();
+    pub fn endgrent();
+    pub fn getgrent() -> *mut ::group;
+
     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;

src/unix/bsd/netbsdlike/mod.rs

@@ -637,6 +637,15 @@ extern {
                         groups: *mut ::gid_t,
                         ngroups: *mut ::c_int) -> ::c_int;
     pub fn initgroups(name: *const ::c_char, basegid: ::gid_t) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwent_r50")]
+    pub fn getpwent_r(pwd: *mut ::passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut ::passwd) -> ::c_int;
+    pub fn getgrent_r(grp: *mut ::group,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut ::group) -> ::c_int;
     pub fn fexecve(fd: ::c_int, argv: *const *const ::c_char,
                    envp: *const *const ::c_char)
                    -> ::c_int;

src/unix/notbsd/linux/mod.rs

@@ -1468,9 +1468,13 @@ extern {
     pub fn setpwent();
     pub fn endpwent();
     pub fn getpwent() -> *mut passwd;
+    pub fn setgrent();
+    pub fn endgrent();
+    pub fn getgrent() -> *mut ::group;
     pub fn setspent();
     pub fn endspent();
     pub fn getspent() -> *mut spwd;
+
     pub fn getspnam(__name: *const ::c_char) -> *mut spwd;
 
     pub fn shm_open(name: *const c_char, oflag: ::c_int,

src/unix/notbsd/linux/other/mod.rs

@@ -867,6 +867,19 @@ extern {
     pub fn mallinfo() -> ::mallinfo;
     pub fn malloc_usable_size(ptr: *mut ::c_void) -> ::size_t;
     pub fn getauxval(type_: ::c_ulong) -> ::c_ulong;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getpwent_r50")]
+    #[cfg_attr(target_os = "solaris", link_name = "__posix_getpwent_r")]
+    pub fn getpwent_r(pwd: *mut ::unix::notbsd::linux::passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut ::unix::notbsd
+                                        ::linux::passwd) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__getgrent_r50")]
+    #[cfg_attr(target_os = "solaris", link_name = "__posix_getgrent_r")]
+    pub fn getgrent_r(grp: *mut ::group,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut ::group) -> ::c_int;
 }
 
 cfg_if! {

src/unix/solaris/mod.rs

@@ -1434,6 +1434,16 @@ extern {
                       buf: *mut ::c_char,
                       buflen: ::size_t,
                       result: *mut *mut passwd) -> ::c_int;
+    #[cfg_attr(target_os = "solaris", link_name = "__posix_getpwent_r")]
+    pub fn getpwent_r(pwd: *mut passwd,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut passwd) -> ::c_int;
+    #[cfg_attr(target_os = "solaris", link_name = "__posix_getgrent_r")]
+    pub fn getgrent_r(grp: *mut ::group,
+                      buf: *mut ::c_char,
+                      buflen: ::size_t,
+                      result: *mut *mut ::group) -> ::c_int;
     #[cfg_attr(target_os = "solaris", link_name = "__posix_sigwait")]
     pub fn sigwait(set: *const sigset_t,
                    sig: *mut ::c_int) -> ::c_int;