SysV shared memory APIs

Author: Alexander Polakov

libc-test/build.rs

@@ -111,6 +111,8 @@ fn main() {
 
     if linux {
         cfg.header("sys/xattr.h");
+        cfg.header("sys/ipc.h");
+        cfg.header("sys/shm.h");
     }
 
     if linux || android {
@@ -235,7 +237,7 @@ fn main() {
             "TCP_COOKIE_TRANSACTIONS" |
             "RLIMIT_RTTIME" if musl => true,
             // work around super old mips toolchain
-            "SCHED_IDLE" => mips,
+            "SCHED_IDLE" | "SHM_NORESERVE" => mips,
 
             _ => false,
         }

src/unix/notbsd/linux/mips.rs

@@ -99,6 +99,32 @@ s! {
         __unused4: *mut ::c_void,
         __unused5: *mut ::c_void,
     }
+
+    pub struct ipc_perm {
+        pub __key: ::key_t,
+        pub uid: ::uid_t,
+        pub gid: ::gid_t,
+        pub cuid: ::uid_t,
+        pub cgid: ::gid_t,
+        pub mode: ::c_uint,
+        pub __seq: ::c_ushort,
+        __pad1: ::c_ushort,
+        __unused1: ::c_ulong,
+        __unused2: ::c_ulong
+    }
+
+    pub struct shmid_ds {
+        pub shm_perm: ::ipc_perm,
+        pub shm_segsz: ::size_t,
+        pub shm_atime: ::time_t,
+        pub shm_dtime: ::time_t,
+        pub shm_ctime: ::time_t,
+        pub shm_cpid: ::pid_t,
+        pub shm_lpid: ::pid_t,
+        pub shm_nattch: ::shmatt_t,
+        __unused4: ::c_ulong,
+        __unused5: ::c_ulong
+    }
 }
 
 pub const BUFSIZ: ::c_uint = 8192;

src/unix/notbsd/linux/mod.rs

@@ -11,6 +11,8 @@ pub type blkcnt64_t = i64;
 pub type rlim64_t = u64;
 pub type fsblkcnt_t = ::c_ulong;
 pub type fsfilcnt_t = ::c_ulong;
+pub type key_t = ::c_int;
+pub type shmatt_t = ::c_ulong;
 
 pub enum fpos64_t {} // TODO: fill this out with a struct
 
@@ -287,9 +289,36 @@ pub const SCHED_RR: ::c_int = 2;
 pub const SCHED_BATCH: ::c_int = 3;
 pub const SCHED_IDLE: ::c_int = 5;
 
+pub const IPC_CREAT: ::c_int = 0o1000;
+pub const IPC_EXCL: ::c_int = 0o2000;
+pub const IPC_NOWAIT: ::c_int = 0o4000;
+
+pub const IPC_RMID: ::c_int = 0;
+pub const IPC_SET: ::c_int = 1;
+pub const IPC_STAT: ::c_int = 2;
+pub const IPC_INFO: ::c_int = 3;
+
+pub const SHM_R: ::c_int = 0o400;
+pub const SHM_W: ::c_int = 0o200;
+
+pub const SHM_RDONLY: ::c_int = 0o10000;
+pub const SHM_RND: ::c_int = 0o20000;
+pub const SHM_REMAP: ::c_int = 0o40000;
+pub const SHM_EXEC: ::c_int = 0o100000;
+
+pub const SHM_LOCK: ::c_int = 11;
+pub const SHM_UNLOCK: ::c_int = 12;
+
+pub const SHM_HUGETLB: ::c_int = 0o4000;
+pub const SHM_NORESERVE: ::c_int = 0o10000;
+
 extern {
     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;
+    pub fn shmat(shmid: ::c_int, shmaddr: *const ::c_void, shmflg: ::c_int) -> *mut ::c_void;
+    pub fn shmdt(shmaddr: *const ::c_void) -> ::c_int;
+    pub fn shmctl(shmid: ::c_int, cmd: ::c_int, buf: *mut ::shmid_ds) -> ::c_int;
     pub fn mprotect(addr: *mut ::c_void, len: ::size_t, prot: ::c_int)
                     -> ::c_int;
     pub fn __errno_location() -> *mut ::c_int;

src/unix/notbsd/linux/musl.rs

@@ -82,6 +82,31 @@ s! {
         pub _pad: [::c_int; 29],
         _align: [usize; 0],
     }
+
+    pub struct ipc_perm {
+        pub __ipc_perm_key: ::key_t,
+        pub uid: ::uid_t,
+        pub gid: ::gid_t,
+        pub cuid: ::uid_t,
+        pub cgid: ::gid_t,
+        pub mode: ::mode_t,
+        pub __seq: ::c_int,
+        __unused1: ::c_long,
+        __unused2: ::c_long
+    }
+
+    pub struct shmid_ds {
+        pub shm_perm: ::ipc_perm,
+        pub shm_segsz: ::size_t,
+        pub shm_atime: ::time_t,
+        pub shm_dtime: ::time_t,
+        pub shm_ctime: ::time_t,
+        pub shm_cpid: ::pid_t,
+        pub shm_lpid: ::pid_t,
+        pub shm_nattch: ::c_ulong,
+        __pad1: ::c_ulong,
+        __pad2: ::c_ulong,
+    }
 }
 
 pub const BUFSIZ: ::c_uint = 1024;

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

@@ -252,3 +252,38 @@ cfg_if! {
         // ...
     }
 }
+
+s! {
+    pub struct ipc_perm {
+        pub __key: ::key_t,
+        pub uid: ::uid_t,
+        pub gid: ::gid_t,
+        pub cuid: ::uid_t,
+        pub cgid: ::gid_t,
+        pub mode: ::c_ushort,
+        __pad1: ::c_ushort,
+        pub __seq: ::c_ushort,
+        __pad2: ::c_ushort,
+        __unused1: ::c_ulong,
+        __unused2: ::c_ulong
+    }
+
+    pub struct shmid_ds {
+        pub shm_perm: ::ipc_perm,
+        pub shm_segsz: ::size_t,
+        pub shm_atime: ::time_t,
+        #[cfg(target_pointer_width = "32")]
+        __unused1: ::c_ulong,
+        pub shm_dtime: ::time_t,
+        #[cfg(target_pointer_width = "32")]
+        __unused2: ::c_ulong,
+        pub shm_ctime: ::time_t,
+        #[cfg(target_pointer_width = "32")]
+        __unused3: ::c_ulong,
+        pub shm_cpid: ::pid_t,
+        pub shm_lpid: ::pid_t,
+        pub shm_nattch: ::shmatt_t,
+        __unused4: ::c_ulong,
+        __unused5: ::c_ulong
+    }
+}