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diff --git a/cmd/parse-syscall-annotations/syscall.go b/cmd/parse-syscall-annotations/syscall.go
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+++ b/cmd/parse-syscall-annotations/syscall.go
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+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This program will take a single golang source file, or a directory containing
+// many source files and produce a JSON output which represent any comments
+// containing compatibility metadata.
+
+// Command parse-syscall-annotations parses syscall annotations from Godoc and
+// generates a JSON file with the parsed syscall info.
+
+package main
+
+// ReverseSyscallMap is a map of syscall name (lowercase) to number
+var ReverseSyscallMap map[string]int
+
+// SyscallMap is a map of syscall number to syscall name (lowercase)
+var SyscallMap = map[int]string{
+	0:   "read",
+	1:   "write",
+	2:   "open",
+	3:   "close",
+	4:   "stat",
+	5:   "fstat",
+	6:   "lstat",
+	7:   "poll",
+	8:   "lseek",
+	9:   "mmap",
+	10:  "mprotect",
+	11:  "munmap",
+	12:  "brk",
+	13:  "rtsigaction",
+	14:  "rtsigprocmask",
+	15:  "rtsigreturn",
+	16:  "ioctl",
+	17:  "pread64",
+	18:  "pwrite64",
+	19:  "readv",
+	20:  "writev",
+	21:  "access",
+	22:  "pipe",
+	23:  "select",
+	24:  "schedyield",
+	25:  "mremap",
+	26:  "msync",
+	27:  "mincore",
+	28:  "madvise",
+	29:  "shmget",
+	30:  "shmat",
+	31:  "shmctl",
+	32:  "dup",
+	33:  "dup2",
+	34:  "pause",
+	35:  "nanosleep",
+	36:  "getitimer",
+	37:  "alarm",
+	38:  "setitimer",
+	39:  "getpid",
+	40:  "sendfile",
+	41:  "socket",
+	42:  "connect",
+	43:  "accept",
+	44:  "sendto",
+	45:  "recvfrom",
+	46:  "sendmsg",
+	47:  "recvmsg",
+	48:  "shutdown",
+	49:  "bind",
+	50:  "listen",
+	51:  "getsockname",
+	52:  "getpeername",
+	53:  "socketpair",
+	54:  "setsockopt",
+	55:  "getsockopt",
+	56:  "clone",
+	57:  "fork",
+	58:  "vfork",
+	59:  "execve",
+	60:  "exit",
+	61:  "wait4",
+	62:  "kill",
+	63:  "uname",
+	64:  "semget",
+	65:  "semop",
+	66:  "semctl",
+	67:  "shmdt",
+	68:  "msgget",
+	69:  "msgsnd",
+	70:  "msgrcv",
+	71:  "msgctl",
+	72:  "fcntl",
+	73:  "flock",
+	74:  "fsync",
+	75:  "fdatasync",
+	76:  "truncate",
+	77:  "ftruncate",
+	78:  "getdents",
+	79:  "getcwd",
+	80:  "chdir",
+	81:  "fchdir",
+	82:  "rename",
+	83:  "mkdir",
+	84:  "rmdir",
+	85:  "creat",
+	86:  "link",
+	87:  "unlink",
+	88:  "symlink",
+	89:  "readlink",
+	90:  "chmod",
+	91:  "fchmod",
+	92:  "chown",
+	93:  "fchown",
+	94:  "lchown",
+	95:  "umask",
+	96:  "gettimeofday",
+	97:  "getrlimit",
+	98:  "getrusage",
+	99:  "sysinfo",
+	100: "times",
+	101: "ptrace",
+	102: "getuid",
+	103: "syslog",
+	104: "getgid",
+	105: "setuid",
+	106: "setgid",
+	107: "geteuid",
+	108: "getegid",
+	109: "setpgid",
+	110: "getppid",
+	111: "getpgrp",
+	112: "setsid",
+	113: "setreuid",
+	114: "setregid",
+	115: "getgroups",
+	116: "setgroups",
+	117: "setresuid",
+	118: "getresuid",
+	119: "setresgid",
+	120: "getresgid",
+	121: "getpgid",
+	122: "setfsuid",
+	123: "setfsgid",
+	124: "getsid",
+	125: "capget",
+	126: "capset",
+	127: "rtsigpending",
+	128: "rtsigtimedwait",
+	129: "rtsigqueueinfo",
+	130: "rtsigsuspend",
+	131: "sigaltstack",
+	132: "utime",
+	133: "mknod",
+	134: "uselib",
+	135: "setpersonality",
+	136: "ustat",
+	137: "statfs",
+	138: "fstatfs",
+	139: "sysfs",
+	140: "getpriority",
+	141: "setpriority",
+	142: "schedsetparam",
+	143: "schedgetparam",
+	144: "schedsetscheduler",
+	145: "schedgetscheduler",
+	146: "schedgetprioritymax",
+	147: "schedgetprioritymin",
+	148: "schedrrgetinterval",
+	149: "mlock",
+	150: "munlock",
+	151: "mlockall",
+	152: "munlockall",
+	153: "vhangup",
+	154: "modifyldt",
+	155: "pivotroot",
+	156: "sysctl",
+	157: "prctl",
+	158: "archprctl",
+	159: "adjtimex",
+	160: "setrlimit",
+	161: "chroot",
+	162: "sync",
+	163: "acct",
+	164: "settimeofday",
+	165: "mount",
+	166: "umount2",
+	167: "swapon",
+	168: "swapoff",
+	169: "reboot",
+	170: "sethostname",
+	171: "setdomainname",
+	172: "iopl",
+	173: "ioperm",
+	174: "createmodule",
+	175: "initmodule",
+	176: "deletemodule",
+	177: "getkernelsyms",
+	178: "querymodule",
+	179: "quotactl",
+	180: "nfsservctl",
+	181: "getpmsg",
+	182: "putpmsg",
+	183: "afssyscall",
+	184: "tuxcall",
+	185: "security",
+	186: "gettid",
+	187: "readahead",
+	188: "setxattr",
+	189: "lsetxattr",
+	190: "fsetxattr",
+	191: "getxattr",
+	192: "lgetxattr",
+	193: "fgetxattr",
+	194: "listxattr",
+	195: "llistxattr",
+	196: "flistxattr",
+	197: "removexattr",
+	198: "lremovexattr",
+	199: "fremovexattr",
+	200: "tkill",
+	201: "time",
+	202: "futex",
+	203: "schedsetaffinity",
+	204: "schedgetaffinity",
+	205: "setthreadarea",
+	206: "iosetup",
+	207: "iodestroy",
+	208: "iogetevents",
+	209: "iosubmit",
+	210: "iocancel",
+	211: "getthreadarea",
+	212: "lookupdcookie",
+	213: "epollcreate",
+	214: "epollctlold",
+	215: "epollwaitold",
+	216: "remapfilepages",
+	217: "getdents64",
+	218: "settidaddress",
+	219: "restartsyscall",
+	220: "semtimedop",
+	221: "fadvise64",
+	222: "timercreate",
+	223: "timersettime",
+	224: "timergettime",
+	225: "timergetoverrun",
+	226: "timerdelete",
+	227: "clocksettime",
+	228: "clockgettime",
+	229: "clockgetres",
+	230: "clocknanosleep",
+	231: "exitgroup",
+	232: "epollwait",
+	233: "epollctl",
+	234: "tgkill",
+	235: "utimes",
+	236: "vserver",
+	237: "mbind",
+	238: "setmempolicy",
+	239: "getmempolicy",
+	240: "mqopen",
+	241: "mqunlink",
+	242: "mqtimedsend",
+	243: "mqtimedreceive",
+	244: "mqnotify",
+	245: "mqgetsetattr",
+	246: "kexec_load",
+	247: "waitid",
+	248: "addkey",
+	249: "requestkey",
+	250: "keyctl",
+	251: "ioprioset",
+	252: "ioprioget",
+	253: "inotifyinit",
+	254: "inotifyaddwatch",
+	255: "inotifyrmwatch",
+	256: "migratepages",
+	257: "openat",
+	258: "mkdirat",
+	259: "mknodat",
+	260: "fchownat",
+	261: "futimesat",
+	262: "fstatat",
+	263: "unlinkat",
+	264: "renameat",
+	265: "linkat",
+	266: "symlinkat",
+	267: "readlinkat",
+	268: "fchmodat",
+	269: "faccessat",
+	270: "pselect",
+	271: "ppoll",
+	272: "unshare",
+	273: "setrobustlist",
+	274: "getrobustlist",
+	275: "splice",
+	276: "tee",
+	277: "syncfilerange",
+	278: "vmsplice",
+	279: "movepages",
+	280: "utimensat",
+	281: "epollpwait",
+	282: "signalfd",
+	283: "timerfdcreate",
+	284: "eventfd",
+	285: "fallocate",
+	286: "timerfdsettime",
+	287: "timerfdgettime",
+	288: "accept4",
+	289: "signalfd4",
+	290: "eventfd2",
+	291: "epollcreate1",
+	292: "dup3",
+	293: "pipe2",
+	294: "inotifyinit1",
+	295: "preadv",
+	296: "pwritev",
+	297: "rttgsigqueueinfo",
+	298: "perfeventopen",
+	299: "recvmmsg",
+	300: "fanotifyinit",
+	301: "fanotifymark",
+	302: "prlimit64",
+	303: "nametohandleat",
+	304: "openbyhandleat",
+	305: "clockadjtime",
+	306: "syncfs",
+	307: "sendmmsg",
+	308: "setns",
+	309: "getcpu",
+	310: "processvmreadv",
+	311: "processvmwritev",
+	312: "kcmp",
+	313: "finitmodule",
+	314: "schedsetattr",
+	315: "schedgetattr",
+	316: "renameat2",
+	317: "seccomp",
+	318: "getrandom",
+	319: "memfdcreate",
+	320: "kexecfileload",
+	321: "bpf",
+	322: "execveat",
+	323: "userfaultfd",
+	324: "membarrier",
+	325: "mlock2",
+	// syscalls after 325 are "backports" from versions of linux after 4.4.
+	326: "copyfilerange",
+	327: "preadv2",
+	328: "pwritev2",
+}