Add optional zerocopy trait derives

Author: joshlf

Cargo.toml

@@ -130,6 +130,7 @@ cargo-args = ["-Zbuild-std=core"]
 
 [dependencies]
 rustc-std-workspace-core = { version = "1.0.0", optional = true }
+zerocopy = { version = "0.7.15", optional = true, features = ["derive"] }
 
 [features]
 default = ["std"]

src/lib.rs

@@ -24,6 +24,10 @@
 #![cfg_attr(feature = "rustc-dep-of-std", no_core)]
 #![cfg_attr(libc_const_extern_fn_unstable, feature(const_extern_fn))]
 
+#[cfg(feature = "zerocopy")]
+#[macro_use]
+extern crate zerocopy;
+
 #[macro_use]
 mod macros;
 

src/unix/aix/mod.rs

@@ -71,24 +71,29 @@ e! {
 }
 
 s! {
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct fsid_t {
         pub val: [::c_uint; 2],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct fsid64_t {
         pub val: [::uint64_t; 2],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct timezone {
         pub tz_minuteswest: ::c_int,
         pub tz_dsttime: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct ip_mreq {
         pub imr_multiaddr: in_addr,
         pub imr_interface: in_addr,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct dirent {
         pub d_offset: ::c_ulong,
         pub d_ino: ::ino_t,
@@ -97,6 +102,7 @@ s! {
         pub d_name: [::c_char; 256]
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct termios {
         pub c_iflag: ::tcflag_t,
         pub c_oflag: ::tcflag_t,
@@ -105,6 +111,7 @@ s! {
         pub c_cc: [::cc_t; ::NCCS]
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct flock64 {
         pub l_type: ::c_short,
         pub l_whence: ::c_short,
@@ -125,6 +132,7 @@ s! {
         pub msg_flags: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct statvfs64 {
         pub f_bsize: ::blksize64_t,
         pub f_frsize: ::blksize64_t,
@@ -171,6 +179,7 @@ s! {
         pub int_n_sign_posn: ::c_char,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct tm {
         pub tm_sec: ::c_int,
         pub tm_min: ::c_int,
@@ -195,22 +204,26 @@ s! {
         pub ai_eflags: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct in_addr {
         pub s_addr: in_addr_t
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct ip_mreq_source {
         pub imr_multiaddr: in_addr,
         pub imr_sourceaddr: in_addr,
         pub imr_interface: in_addr,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr {
         pub sa_len: ::c_uchar,
         pub sa_family: sa_family_t,
         pub sa_data: [::c_char; 14],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr_dl {
         pub sdl_len: ::c_uchar,
         pub sdl_family: ::c_uchar,
@@ -222,6 +235,7 @@ s! {
         pub sdl_data: [::c_char; 120],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr_in {
         pub sin_len: ::c_uchar,
         pub sin_family: sa_family_t,
@@ -230,6 +244,7 @@ s! {
         pub sin_zero: [::c_char; 8]
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr_in6 {
         pub sin6_len: ::c_uchar,
         pub sin6_family: ::c_uchar,
@@ -239,6 +254,7 @@ s! {
         pub sin6_scope_id: ::uint32_t
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr_storage {
         pub __ss_len: ::c_uchar,
         pub ss_family: sa_family_t,
@@ -247,17 +263,20 @@ s! {
         __ss_pad2: [::c_char; 1265],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sockaddr_un {
         pub sun_len: ::c_uchar,
         pub sun_family: sa_family_t,
         pub sun_path: [::c_char; 1023]
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct st_timespec {
         pub tv_sec: ::time_t,
         pub tv_nsec: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct statfs64 {
         pub f_version: ::c_int,
         pub f_type: ::c_int,
@@ -289,6 +308,7 @@ s! {
         pub pw_shell: *mut ::c_char
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct utsname {
         pub sysname: [::c_char; 32],
         pub nodename: [::c_char; 32],
@@ -297,12 +317,14 @@ s! {
         pub machine: [::c_char; 32],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct xutsname {
         pub nid: ::c_uint,
         pub reserved: ::c_int,
         pub longnid: ::c_ulonglong,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct cmsghdr {
         pub cmsg_len: ::socklen_t,
         pub cmsg_level: ::c_int,
@@ -318,10 +340,12 @@ s! {
     }
 
     // Should be union with another 'sival_int'
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sigval64 {
         pub sival_ptr: ::c_ulonglong,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sigevent64 {
         pub sigev_value: sigval64,
         pub sigev_signo: ::c_int,
@@ -335,6 +359,7 @@ s! {
         pub sevt_signo: signal_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct poll_ctl {
         pub cmd: ::c_short,
         pub events: ::c_short,
@@ -353,11 +378,13 @@ s! {
         pub bytes_sent: ::uint64_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct mmsghdr {
         pub msg_hdr: ::msghdr,
         pub msg_len: ::c_uint,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sched_param {
         pub sched_priority: ::c_int,
         pub sched_policy: ::c_int,
@@ -371,6 +398,7 @@ s! {
         pub __pad: [::c_int; 4],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct posix_spawnattr_t {
         pub posix_attr_flags: ::c_short,
         pub posix_attr_pgroup: ::pid_t,
@@ -388,6 +416,7 @@ s! {
         pub gl_ptx: *mut ::c_void,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct mallinfo {
         pub arena: ::c_ulong,
         pub ordblks: ::c_int,
@@ -401,11 +430,13 @@ s! {
         pub keepcost: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct utmp_exit_status {
         pub e_termination: ::c_short,
         pub e_exit: ::c_short,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct utmp {
         pub ut_user: [::c_char; 256],
         pub ut_id: [::c_char; 14],
@@ -420,6 +451,7 @@ s! {
         pub __reservedV: [::c_int; 6],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct regmatch_t {
         pub rm_so: regoff_t,
         pub rm_eo: regoff_t,
@@ -439,11 +471,13 @@ s! {
         pub __unused: [*mut ::c_void; 34],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct rlimit64 {
         pub rlim_cur: rlim64_t,
         pub rlim_max: rlim64_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct shmid_ds {
         pub shm_perm: ipc_perm,
         pub shm_segsz: ::size_t,
@@ -462,6 +496,7 @@ s! {
         pub shm_reserved1: ::int64_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct stat64 {
         pub st_dev: dev_t,
         pub st_ino: ino_t,
@@ -494,6 +529,7 @@ s! {
         pub mnt_passno: ::c_int,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct ipc_perm {
         pub uid: ::uid_t,
         pub gid: ::gid_t,
@@ -510,13 +546,15 @@ s! {
         pub data: *mut ::c_void,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct mq_attr {
         pub mq_flags: ::c_long,
         pub mq_maxmsg: ::c_long,
         pub mq_msgsize: ::c_long,
         pub mq_curmsgs: ::c_long,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct sembuf {
         pub sem_num: ::c_ushort,
         pub sem_op: ::c_short,
@@ -528,6 +566,7 @@ s! {
         pub if_name: *mut ::c_char,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct itimerspec {
         pub it_interval: ::timespec,
         pub it_value: ::timespec,

src/unix/align.rs

@@ -1,4 +1,5 @@
 s! {
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     #[repr(align(4))]
     pub struct in6_addr {
         pub s6_addr: [u8; 16],

src/unix/mod.rs

@@ -59,18 +59,21 @@ s! {
         pub gr_mem: *mut *mut ::c_char,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct utimbuf {
         pub actime: time_t,
         pub modtime: time_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct timeval {
         pub tv_sec: time_t,
         pub tv_usec: suseconds_t,
     }
 
     // linux x32 compatibility
     // See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct timespec {
         pub tv_sec: time_t,
         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
@@ -79,11 +82,13 @@ s! {
         pub tv_nsec: ::c_long,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct rlimit {
         pub rlim_cur: rlim_t,
         pub rlim_max: rlim_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct rusage {
         pub ru_utime: timeval,
         pub ru_stime: timeval,
@@ -134,6 +139,7 @@ s! {
         __reserved: [c_long; 16],
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct ipv6_mreq {
         pub ipv6mr_multiaddr: in6_addr,
         #[cfg(target_os = "android")]
@@ -155,19 +161,22 @@ s! {
         pub iov_len: ::size_t,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct pollfd {
         pub fd: ::c_int,
         pub events: ::c_short,
         pub revents: ::c_short,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct winsize {
         pub ws_row: ::c_ushort,
         pub ws_col: ::c_ushort,
         pub ws_xpixel: ::c_ushort,
         pub ws_ypixel: ::c_ushort,
     }
 
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct linger {
         pub l_onoff: ::c_int,
         pub l_linger: ::c_int,
@@ -179,12 +188,14 @@ s! {
     }
 
     // <sys/time.h>
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct itimerval {
         pub it_interval: ::timeval,
         pub it_value: ::timeval,
     }
 
     // <sys/times.h>
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct tms {
         pub tms_utime: ::clock_t,
         pub tms_stime: ::clock_t,

src/unix/no_align.rs

@@ -1,4 +1,5 @@
 s! {
+    #[cfg_attr(feature = "zerocopy", derive(FromZeroes, FromBytes, AsBytes))]
     pub struct in6_addr {
         pub s6_addr: [u8; 16],
         __align: [u32; 0],