Move auxvec constants into linux_like/mod.rs

Author: workingjubilee

src/unix/linux_like/auxvec.rs

@@ -1196,13 +1196,53 @@ pub const POSIX_FADV_RANDOM: ::c_int = 1;
 pub const POSIX_FADV_SEQUENTIAL: ::c_int = 2;
 pub const POSIX_FADV_WILLNEED: ::c_int = 3;
 
-pub const AT_FDCWD: ::c_int = -100;
-pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x100;
-pub const AT_REMOVEDIR: ::c_int = 0x200;
-pub const AT_SYMLINK_FOLLOW: ::c_int = 0x400;
-pub const AT_NO_AUTOMOUNT: ::c_int = 0x800;
-pub const AT_EMPTY_PATH: ::c_int = 0x1000;
-pub const AT_RECURSIVE: ::c_int = 0x8000;
+// flags for "at"-suffixed file operations, e.g. execveat, openat
+pub const AT_FDCWD: ::c_int = -100; // used instead of dirfd
+pub const AT_REMOVEDIR: ::c_int = 0x200; // unlinkat
+pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x100; // fstatat
+pub const AT_NO_AUTOMOUNT: ::c_int = 0x800; // fstatat
+pub const AT_SYMLINK_FOLLOW: ::c_int = 0x400; // linkat
+pub const AT_EMPTY_PATH: ::c_int = 0x1000; // linkat
+pub const AT_RECURSIVE: ::c_int = 0x8000; // mount_setattr
+
+// not to be confused with this completely unrelated list:
+// keys to the values in the ELF auxiliary vector, usable with getauxval
+// found at uapi/linux/auxvec.h in the kernel and elf/elf.h in musl and glibc
+pub const AT_NULL: ::c_ulong = 0;
+pub const AT_IGNORE: ::c_ulong = 1;
+pub const AT_EXECFD: ::c_ulong = 2;
+pub const AT_PHDR: ::c_ulong = 3;
+pub const AT_PHENT: ::c_ulong = 4;
+pub const AT_PHNUM: ::c_ulong = 5;
+pub const AT_PAGESZ: ::c_ulong = 6;
+pub const AT_BASE: ::c_ulong = 7;
+pub const AT_FLAGS: ::c_ulong = 8;
+pub const AT_ENTRY: ::c_ulong = 9;
+pub const AT_NOTELF: ::c_ulong = 10;
+pub const AT_UID: ::c_ulong = 11;
+pub const AT_EUID: ::c_ulong = 12;
+pub const AT_GID: ::c_ulong = 13;
+pub const AT_EGID: ::c_ulong = 14;
+pub const AT_PLATFORM: ::c_ulong = 15;
+pub const AT_HWCAP: ::c_ulong = 16;
+pub const AT_CLKTCK: ::c_ulong = 17;
+
+pub const AT_SECURE: ::c_ulong = 23;
+pub const AT_BASE_PLATFORM: ::c_ulong = 24;
+pub const AT_RANDOM: ::c_ulong = 25;
+pub const AT_HWCAP2: ::c_ulong = 26;
+
+pub const AT_EXECFN: ::c_ulong = 31;
+
+// defined in arch/<arch>/include/uapi/asm/auxvec.h but has the same value
+// wherever it is defined, so glibc and musl also define it universally
+// unsupported values return ENOENT so it's relatively "safe" to define
+pub const AT_SYSINFO_EHDR: ::c_ulong = 33;
+
+pub const AT_MINSIGSTKSZ: ::c_ulong = 51;
+// getauxval AT_* values should be current for all "architecture-neutral" ones as of
+// Linux headers: include/uapi/linux/auxvec.h    kernel 6.1
+// Android NDK: libc/kernel/uapi/linux/auxvec.h  NDK 25 (updated ~5.14)
 
 pub const LOG_CRON: ::c_int = 9 << 3;
 pub const LOG_AUTHPRIV: ::c_int = 10 << 3;