utmpx api for linux musl + musl few build fixes.

close rust-lang#3190

Author: devnexen

libc-test/semver/linux-gnu.txt

@@ -575,12 +575,12 @@ dlinfo
 dlmopen
 endutxent
 explicit_bzero
+fgetgrent_r
 fgetspent_r
 futimes
 getauxval
 getentropy
 getgrent_r
-fgetgrent_r
 getloadavg
 getpt
 getpwent_r

libc-test/semver/linux-musl.txt

@@ -32,13 +32,22 @@ aio_return
 aio_suspend
 aio_write
 aiocb
+asctime_r
+basename
 clock_adjtime
 copy_file_range
 ctermid
+dirname
+eaccess
+endutxent
+euidaccess
 explicit_bzero
 futimes
 getauxval
 getloadavg
+getutxent
+getutxid
+getutxline
 lio_listio
 ntptimeval
 open_wmemstream
@@ -47,13 +56,10 @@ prlimit
 prlimit64
 process_vm_readv
 process_vm_writev
+pututxline
 pwritev64
 reallocarray
-timex
-euidaccess
-eaccess
-asctime_r
+setutxent
 strftime
 strptime
-dirname
-basename
+timex

src/unix/linux_like/linux/arch/generic/mod.rs

@@ -279,7 +279,11 @@ cfg_if! {
         pub const RLIMIT_NICE: ::c_int = 13;
         pub const RLIMIT_RTPRIO: ::c_int = 14;
         pub const RLIMIT_RTTIME: ::c_int = 15;
+        #[cfg(target_env = "ohos")]
+        // FIXME: is it ?
         pub const RLIM_NLIMITS: ::c_int = 15;
+        #[cfg(target_env = "musl")]
+        pub const RLIM_NLIMITS: ::c_int = 16;
         pub const RLIMIT_NLIMITS: ::c_int = RLIM_NLIMITS;
     }
 }

src/unix/linux_like/linux/musl/b64/x86_64/mod.rs

@@ -671,7 +671,7 @@ pub const MAP_32BIT: ::c_int = 0x0040;
 pub const O_APPEND: ::c_int = 1024;
 pub const O_DIRECT: ::c_int = 0x4000;
 pub const O_DIRECTORY: ::c_int = 0x10000;
-pub const O_LARGEFILE: ::c_int = 0;
+pub const O_LARGEFILE: ::c_int = 0x8000;
 pub const O_NOFOLLOW: ::c_int = 0x20000;
 pub const O_CREAT: ::c_int = 64;
 pub const O_EXCL: ::c_int = 128;

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

@@ -303,7 +303,7 @@ s_no_extra_traits! {
         pub ut_exit: __exit_status,
 
         #[cfg(target_env = "musl")]
-        pub ut_session: ::c_long,
+        pub ut_session: ::c_int,
 
         #[cfg(target_env = "ohos")]
         #[cfg(target_endian = "little")]
@@ -782,6 +782,13 @@ extern "C" {
 
     pub fn dirname(path: *mut ::c_char) -> *mut ::c_char;
     pub fn basename(path: *mut ::c_char) -> *mut ::c_char;
+
+    pub fn getutxent() -> *mut utmpx;
+    pub fn getutxid(ut: *const utmpx) -> *mut utmpx;
+    pub fn getutxline(ut: *const utmpx) -> *mut utmpx;
+    pub fn pututxline(ut: *const utmpx) -> *mut utmpx;
+    pub fn setutxent();
+    pub fn endutxent();
 }
 
 cfg_if! {