Auto merge of #726 - JayH5:init-get-groups, r=alexcrichton

Add getgrouplist(), add initgroups() to BSD platforms

Author: bors

src/unix/bsd/apple/mod.rs

@@ -1798,6 +1798,10 @@ extern {
     pub fn fremovexattr(filedes: ::c_int, name: *const ::c_char,
                         flags: ::c_int) -> ::c_int;
 
+    pub fn getgrouplist(name: *const ::c_char,
+                        basegid: ::c_int,
+                        groups: *mut ::c_int,
+                        ngroups: *mut ::c_int) -> ::c_int;
     pub fn initgroups(user: *const ::c_char, basegroup: ::c_int) -> ::c_int;
 
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),

src/unix/bsd/freebsdlike/mod.rs

@@ -964,6 +964,11 @@ extern {
     pub fn setutxent();
     pub fn setresgid(rgid: ::gid_t, egid: ::gid_t, sgid: ::gid_t) -> ::c_int;
     pub fn setresuid(ruid: ::uid_t, euid: ::uid_t, suid: ::uid_t) -> ::c_int;
+    pub fn getgrouplist(name: *const ::c_char,
+                        basegid: ::gid_t,
+                        groups: *mut ::gid_t,
+                        ngroups: *mut ::c_int) -> ::c_int;
+    pub fn initgroups(name: *const ::c_char, basegid: ::gid_t) -> ::c_int;
 }
 
 #[link(name = "util")]

src/unix/bsd/netbsdlike/mod.rs

@@ -616,6 +616,12 @@ extern {
     pub fn pthread_mutex_timedlock(lock: *mut pthread_mutex_t,
                                    abstime: *const ::timespec) -> ::c_int;
     pub fn pipe2(fds: *mut ::c_int, flags: ::c_int) -> ::c_int;
+
+    pub fn getgrouplist(name: *const ::c_char,
+                        basegid: ::gid_t,
+                        groups: *mut ::gid_t,
+                        ngroups: *mut ::c_int) -> ::c_int;
+    pub fn initgroups(name: *const ::c_char, basegid: ::gid_t) -> ::c_int;
 }
 
 cfg_if! {

src/unix/notbsd/mod.rs

@@ -880,6 +880,10 @@ extern {
     pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
     pub fn setgroups(ngroups: ::size_t,
                      ptr: *const ::gid_t) -> ::c_int;
+    pub fn getgrouplist(user: *const ::c_char,
+                        group: ::gid_t,
+                        groups: *mut ::gid_t,
+                        ngroups: *mut ::c_int) -> ::c_int;
     pub fn initgroups(user: *const ::c_char, group: ::gid_t) -> ::c_int;
     pub fn sched_setscheduler(pid: ::pid_t,
                               policy: ::c_int,