add musl and glibc wrappers for getdents{,64}

libc-test/semver/dragonfly.txt

@@ -1348,6 +1348,7 @@ freezero
 fsid_t
 fstatfs
 futimes
+getdents
 getdomainname
 getdtablesize
 getentropy

libc-test/semver/freebsd.txt

@@ -1984,6 +1984,7 @@ fsid_t
 fstatfs
 ftok
 futimes
+getdents
 getdomainname
 getdtablesize
 getgrent

libc-test/semver/hurd.txt

@@ -0,0 +1 @@
+getdents64

libc-test/semver/linux-gnu.txt

@@ -604,6 +604,7 @@ fgetpwent_r
 fgetspent_r
 futimes
 getauxval
+getdents64
 getentropy
 getgrent_r
 getloadavg

libc-test/semver/linux-musl.txt

@@ -65,6 +65,8 @@ euidaccess
 explicit_bzero
 futimes
 getauxval
+getdents
+getdents64
 getloadavg
 getutxent
 getutxid

libc-test/semver/netbsd.txt

@@ -1340,6 +1340,7 @@ ftok
 futimes
 getbootfile
 getbyteorder
+getdents
 getdiskrawname
 getdistcookedname
 getdomainname

libc-test/semver/openbsd.txt

@@ -1113,6 +1113,7 @@ ftok
 fusefs_args
 futex
 futimes
+getdents
 getdomainname
 getdtablesize
 getentropy

src/unix/bsd/freebsdlike/dragonfly/mod.rs

@@ -1586,6 +1586,8 @@ extern "C" {
     ) -> c_int;
 
     pub fn closefrom(lowfd: c_int) -> c_int;
+
+    pub fn getdents(fd: c_int, buf: *mut c_char, nbytes: c_int) -> c_int;
 }
 
 #[link(name = "rt")]

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -4818,6 +4818,10 @@ cfg_if! {
     }
 }
 
+extern "C" {
+    pub fn getdents(fd: c_int, buf: *mut c_char, nbytes: usize) -> isize;
+}
+
 extern "C" {
     #[cfg_attr(doc, doc(alias = "__errno_location"))]
     #[cfg_attr(doc, doc(alias = "errno"))]

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

@@ -2957,6 +2957,8 @@ extern "C" {
     pub fn flags_to_string(flags: c_ulong, def: *const c_char) -> c_int;
 
     pub fn kinfo_getvmmap(pid: crate::pid_t, cntp: *mut size_t) -> *mut kinfo_vmentry;
+
+    pub fn getdents(fd: c_int, buf: *mut c_char, nbytes: usize) -> c_int;
 }
 
 #[link(name = "execinfo")]

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

@@ -2074,6 +2074,8 @@ extern "C" {
     pub fn fstatfs(fd: c_int, buf: *mut statfs) -> c_int;
     pub fn getmntinfo(mntbufp: *mut *mut crate::statfs, flags: c_int) -> c_int;
     pub fn getfsstat(buf: *mut statfs, bufsize: size_t, flags: c_int) -> c_int;
+
+    pub fn getdents(fd: c_int, buf: *mut c_void, nbytes: usize) -> c_int;
 }
 
 #[link(name = "execinfo")]

src/unix/hurd/mod.rs

@@ -4282,6 +4282,8 @@ extern "C" {
     pub fn seekdir(dirp: *mut crate::DIR, loc: c_long);
     pub fn telldir(dirp: *mut crate::DIR) -> c_long;
 
+    pub fn getdents64(fd: c_int, buf: *mut c_void, nbytes: usize) -> isize;
+
     pub fn dirfd(dirp: *mut crate::DIR) -> c_int;
 
     #[link_name = "__xpg_strerror_r"]

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

@@ -1346,6 +1346,13 @@ extern "C" {
     pub fn mempcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
 }
 
+extern "C" {
+    // There is no glibc wrapper for the getdents system call, and getdents64() is only available
+    // from 2.30 onwards.
+    /// `buffer` points to a buffer of [`crate::dirent64`] structs.
+    pub fn getdents64(fd: c_int, buffer: *mut c_void, nbytes: usize) -> isize;
+}
+
 cfg_if! {
     if #[cfg(any(
         target_arch = "x86",

src/unix/linux_like/linux/musl/lfs64.rs

@@ -198,6 +198,11 @@ pub unsafe extern "C" fn readdir64_r(
     crate::readdir_r(dirp, entry as *mut _, result as *mut _)
 }
 
+#[inline]
+pub unsafe extern "C" fn getdents64(fd: c_int, buf: *mut crate::dirent64, len: usize) -> c_int {
+    crate::getdents(fd, buf as *mut _, len)
+}
+
 #[inline]
 pub unsafe extern "C" fn sendfile64(
     out_fd: c_int,

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

@@ -971,6 +971,10 @@ extern "C" {
     pub fn utmpxname(file: *const c_char) -> c_int;
 }
 
+extern "C" {
+    pub fn getdents(fd: c_int, buf: *mut crate::dirent, len: usize) -> c_int;
+}
+
 // Alias <foo> to <foo>64 to mimic glibc's LFS64 support
 mod lfs64;
 pub use self::lfs64::*;