Initial support for NuttX

Define the essential types that for NuttX OS.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

build.rs

@@ -24,7 +24,9 @@ const ALLOWED_CFGS: &'static [&'static str] = &[
 const CHECK_CFG_EXTRA: &'static [(&'static str, &'static [&'static str])] = &[
     (
         "target_os",
-        &["switch", "aix", "ohos", "hurd", "rtems", "visionos"],
+        &[
+            "switch", "aix", "ohos", "hurd", "rtems", "visionos", "nuttx",
+        ],
     ),
     ("target_env", &["illumos", "wasi", "aix", "ohos"]),
     (

src/unix/mod.rs

@@ -326,8 +326,11 @@ extern "C" {
 }
 
 cfg_if! {
-    if #[cfg(any(target_os = "l4re", target_os = "espidf"))] {
-        // required libraries for L4Re and the ESP-IDF framework are linked externally, ATM
+    if #[cfg(any(target_os = "l4re", target_os = "espidf", target_os = "nuttx"))] {
+        // required libraries are linked externally for these platforms:
+        // * L4Re
+        // * ESP-IDF
+        // * NuttX
     } else if #[cfg(feature = "std")] {
         // cargo build, don't pull in anything extra as the std dep
         // already pulls in all libs.
@@ -1610,6 +1613,9 @@ cfg_if! {
     } else if #[cfg(target_os = "hurd")] {
         mod hurd;
         pub use self::hurd::*;
+    } else if #[cfg(target_os = "nuttx")] {
+        mod nuttx;
+        pub use self::nuttx::*;
     } else {
         // Unknown target_os
     }

src/unix/nuttx/mod.rs

@@ -0,0 +1,210 @@
+use c_void;
+use timespec;
+
+pub type blkcnt_t = u64;
+pub type blksize_t = i16;
+pub type c_char = i8;
+pub type c_long = isize;
+pub type c_ulong = usize;
+pub type cc_t = u8;
+pub type clock_t = i64;
+pub type dev_t = i32;
+pub type fsblkcnt_t = u64;
+pub type locale_t = *mut i8;
+pub type mode_t = u32;
+pub type nfds_t = u32;
+pub type off_t = i64;
+pub type pthread_key_t = i32;
+pub type pthread_mutexattr_t = u8;
+pub type pthread_rwlockattr_t = i32;
+pub type pthread_t = i32;
+pub type rlim_t = i64;
+pub type sa_family_t = u16;
+pub type socklen_t = u32;
+pub type speed_t = usize;
+pub type suseconds_t = i32;
+pub type tcflag_t = u32;
+pub type time_t = i64;
+pub type wchar_t = i32;
+
+s! {
+    pub struct stat {
+        pub st_dev: dev_t,
+        pub st_ino: u64,
+        pub st_mode: mode_t,
+        pub st_nlink: u64,
+        pub st_uid: u32,
+        pub st_gid: u32,
+        pub st_rdev: dev_t,
+        pub st_size: off_t,
+        pub st_atim: timespec,
+        pub st_mtim: timespec,
+        pub st_ctim: timespec,
+        pub st_blksize: blksize_t,
+        pub st_blocks: i64,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct sockaddr {
+        pub sa_family: sa_family_t,
+        pub sa_data: [u8; 14],
+    }
+
+    pub struct passwd {
+        pub pw_name: *const c_char,
+        pub pw_uid: u32,
+        pub pw_gid: u32,
+        pub pw_gecos: *const c_char,
+        pub pw_dir: *const c_char,
+        pub pw_shell: *const c_char,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__]
+    }
+
+    pub struct sem_t { __val: [usize; __SEM_SIZE__] }
+
+    pub struct pthread_attr_t { __val: [usize; __PTHREAD_ATTR_SIZE__] }
+
+    pub struct pthread_mutex_t { __val: [usize; __PTHREAD_MUTEX_SIZE__] }
+
+    pub struct pthread_cond_t { __val: [usize; __PTHREAD_COND_SIZE__] }
+
+    pub struct pthread_condattr_t { __val: [usize; __PTHREAD_CONDATTR_SIZE__] }
+
+    pub struct Dl_info {
+        pub dli_fname: *const c_char,
+        pub dli_fbase: *mut c_void,
+        pub dli_sname: *const c_char,
+        pub dli_saddr: *mut c_void,
+    }
+
+    pub struct lconv {
+        pub decimal_point: *const c_char,
+        pub thousands_sep: *const c_char,
+        pub grouping: *const c_char,
+        pub int_curr_symbol: *const c_char,
+        pub currency_symbol: *const c_char,
+        pub mon_decimal_point: *const c_char,
+        pub mon_thousands_sep: *const c_char,
+        pub mon_grouping: *const c_char,
+        pub positive_sign: *const c_char,
+        pub negative_sign: *const c_char,
+        pub int_frac_digits: i8,
+        pub frac_digits: i8,
+        pub p_cs_precedes: i8,
+        pub p_sep_by_space: i8,
+        pub n_cs_precedes: i8,
+        pub n_sep_by_space: i8,
+        pub p_sign_posn: i8,
+        pub n_sign_posn: i8,
+        pub int_n_cs_precedes: i8,
+        pub int_n_sep_by_space: i8,
+        pub int_n_sign_posn: i8,
+        pub int_p_cs_precedes: i8,
+        pub int_p_sep_by_space: i8,
+        pub int_p_sign_posn: i8,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct tm {
+        pub tm_sec: i32,
+        pub tm_min: i32,
+        pub tm_hour: i32,
+        pub tm_mday: i32,
+        pub tm_mon: i32,
+        pub tm_year: i32,
+        pub tm_wday: i32,
+        pub tm_yday: i32,
+        pub tm_isdst: i32,
+        pub tm_gmtoff: isize,
+        pub tm_zone: *const i8,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct addrinfo {
+        pub ai_flags: i32,
+        pub ai_family: i32,
+        pub ai_socktype: i32,
+        pub ai_protocol: i32,
+        pub ai_addrlen: socklen_t,
+        pub ai_addr: *mut sockaddr,
+        pub ai_canonname: *mut c_char,
+        pub ai_next: *mut addrinfo,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct pthread_rwlock_t {
+        __val: [usize; __PTHREAD_RWLOCK_SIZE__],
+    }
+
+    pub struct statvfs {
+        pub f_bsize: usize,
+        pub f_frsize: usize,
+        pub f_blocks: fsblkcnt_t,
+        pub f_bfree: fsblkcnt_t,
+        pub f_bavail: fsblkcnt_t,
+        pub f_files: fsblkcnt_t,
+        pub f_ffree: fsblkcnt_t,
+        pub f_favail: fsblkcnt_t,
+        pub f_fsid: usize,
+        pub f_flag: usize,
+        pub f_namemax: usize,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct dirent {
+        pub d_type: u8,
+        pub d_name: [u8; __NAME_MAX__ + 1],
+    }
+
+    pub struct fd_set {
+        __val: [u32; __FDSET_SIZE__],
+    }
+
+    pub struct sigset_t {
+        __val: [u32; __SIGSET_SIZE__],
+    }
+
+    pub struct sigaction {
+        pub sa_handler: usize,
+        pub sa_mask: sigset_t,
+        pub sa_flags: i32,
+        pub sa_user: usize,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct termios {
+        pub c_iflag: tcflag_t,
+        pub c_oflag: tcflag_t,
+        pub c_cflag: tcflag_t,
+        pub c_lflag: tcflag_t,
+        pub c_cc: [cc_t; 12],
+        pub c_speed: speed_t,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+}
+
+// Reserved two pointer size for reserved area for some structures.
+// This ensures that the size of these structures is large enough
+// if more fields are added in the NuttX side.
+//
+// These structures are that defined by POSIX but only necessary fields are included,
+// for example, struct passwd, https://pubs.opengroup.org/onlinepubs/009695399/basedefs/pwd.h.html,
+// POSIX only defines following fields in struct passwd:
+// char    *pw_name   User's login name.
+// uid_t    pw_uid    Numerical user ID.
+// gid_t    pw_gid    Numerical group ID.
+// char    *pw_dir    Initial working directory.
+// char    *pw_shell  Program to use as shell.
+// Other fields can be different depending on the implementation.
+
+const __DEFAULT_RESERVED_SIZE__: usize = 2;
+
+const __PTHREAD_ATTR_SIZE__: usize = 5;
+const __PTHREAD_MUTEX_SIZE__: usize = 9;
+const __PTHREAD_COND_SIZE__: usize = 7;
+const __PTHREAD_CONDATTR_SIZE__: usize = 5;
+const __PTHREAD_RWLOCK_SIZE__: usize = 17;
+const __SEM_SIZE__: usize = 6;
+const __NAME_MAX__: usize = 64;
+const __FDSET_SIZE__: usize = 10;
+const __SIGSET_SIZE__: usize = 8;