Auto merge of #867 - Susurrus:ucreds, r=alexcrichton

Ucreds

I'm not positive on the `SOCKCREDSIZE()` implementation, but we'll see what CI says I guess.

Author: bors

src/dox.rs

@@ -146,5 +146,6 @@ mod imp {
 
     pub mod mem {
         pub fn size_of_val<T>(_: &T) -> usize { 4 }
+        pub fn size_of<T>(_: &T) -> usize { 4 }
     }
 }

src/unix/bsd/freebsdlike/mod.rs

@@ -159,6 +159,15 @@ s! {
         pub int_p_sign_posn: ::c_char,
         pub int_n_sign_posn: ::c_char,
     }
+
+    pub struct cmsgcred {
+        pub cmcred_pid: ::pid_t,
+        pub cmcred_uid: ::uid_t,
+        pub cmcred_euid: ::uid_t,
+        pub cmcred_gid: ::gid_t,
+        pub cmcred_ngroups: ::c_short,
+        pub cmcred_groups: [::gid_t; CMGROUP_MAX],
+    }
 }
 
 pub const AIO_LISTIO_MAX: ::c_int = 16;
@@ -934,6 +943,8 @@ pub const OCRNL: ::tcflag_t = 0x10;
 pub const ONOCR: ::tcflag_t = 0x20;
 pub const ONLRET: ::tcflag_t = 0x40;
 
+pub const CMGROUP_MAX: usize = 16;
+
 f! {
     pub fn WIFCONTINUED(status: ::c_int) -> bool {
         status == 0x13

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -1,3 +1,5 @@
+use dox::mem;
+
 pub type clock_t = ::c_uint;
 pub type suseconds_t = ::c_int;
 pub type dev_t = u64;
@@ -281,6 +283,16 @@ s! {
         pub ifm_index: ::c_ushort,
         pub ifm_data: if_data,
     }
+
+    pub struct sockcred {
+        pub sc_pid: ::pid_t,
+        pub sc_uid: ::uid_t,
+        pub sc_euid: ::uid_t,
+        pub sc_gid: ::gid_t,
+        pub sc_egid: ::gid_t,
+        pub sc_ngroups: ::c_int,
+        pub sc_groups: [::gid_t; 1],
+    }
 }
 
 pub const AT_FDCWD: ::c_int = -100;
@@ -910,12 +922,21 @@ pub const SOCK_NONBLOCK: ::c_int = 0x20000000;
 // http://cvsweb.netbsd.org/bsdweb.cgi/src/include/dirent.h?rev=1.36
 f! {
     pub fn dirfd(dirp: *mut ::DIR) -> ::c_int {
-        unsafe { *(dirp as *const ::c_int) }
+        *(dirp as *const ::c_int)
     }
 
     pub fn WIFCONTINUED(status: ::c_int) -> bool {
         status == 0xffff
     }
+
+    pub fn SOCKCREDSIZE(ngrps: usize) -> usize {
+        let ngrps = if ngrps > 0 {
+            ngrps - 1
+        } else {
+            0
+        };
+        mem::size_of::<sockcred>() + mem::size_of::<::gid_t>() * ngrps
+    }
 }
 
 extern {

src/unix/notbsd/linux/mod.rs

@@ -448,6 +448,12 @@ s! {
         pub p_memsz: Elf64_Xword,
         pub p_align: Elf64_Xword,
     }
+
+    pub struct ucred {
+        pub pid: ::pid_t,
+        pub uid: ::uid_t,
+        pub gid: ::gid_t,
+    }
 }
 
 pub const ABDAY_1: ::nl_item = 0x20000;

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

@@ -75,12 +75,6 @@ s! {
         pub mem_unit: ::c_uint,
         pub __reserved: [::c_char; 256],
     }
-
-    pub struct ucred {
-        pub pid: ::pid_t,
-        pub uid: ::uid_t,
-        pub gid: ::gid_t,
-    }
 }
 
 pub const SFD_CLOEXEC: ::c_int = 0x080000;

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

@@ -104,12 +104,6 @@ s! {
         __unused5: *mut ::c_void,
     }
 
-    pub struct ucred {
-        pub pid: ::pid_t,
-        pub uid: ::uid_t,
-        pub gid: ::gid_t,
-    }
-
     pub struct statfs {
         pub f_type: __fsword_t,
         pub f_bsize: __fsword_t,

src/unix/notbsd/linux/s390x.rs

@@ -221,12 +221,6 @@ s! {
         __unused5: *mut ::c_void,
     }
 
-    pub struct ucred {
-        pub pid: ::pid_t,
-        pub uid: ::uid_t,
-        pub gid: ::gid_t,
-    }
-
     pub struct flock {
         pub l_type: ::c_short,
         pub l_whence: ::c_short,