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Nim/tools/detect/detect.nim
alaviss 1bdc30bdb1 Make file descriptors from stdlib non-inheritable by default (#13201) 
* io: make file descriptors non-inheritable by default

This prevents file descriptors/handles leakage to child processes
that might cause issues like running out of file descriptors, or potential
security issues like leaking a file descriptor to a restricted file.

While this breaks backward compatibility, I'm rather certain that not
many programs (if any) actually make use of this implementation detail.
A new API `setInheritable` is provided for the few that actually want to
use this functionality.

* io: disable inheritance at file creation time for supported platforms

Some platforms provide extension to fopen-family of functions to allow
for disabling descriptor inheritance atomically during File creation.
This guards against possible leaks when a child process is spawned
before we managed to disable the file descriptor inheritance
(ie. in a multi-threaded program).

* net, nativesockets: make sockets non inheritable by default

With this commit, sockets will no longer leak to child processes when
you don't want it to. Should solves a lot of "address in use" that might
occur when your server has just restarted.

All APIs that create sockets in these modules now expose a `inheritable`
flag that allow users to toggle inheritance for the resulting sockets.
An implementation of `setInheritance()` is also provided for SocketHandle.

While atomically disabling inheritance at creation time is supported on
Windows, it's only implemented by native winsock2, which is too much for
now. This support can be implemented in a future patch.

* posix: add F_DUPFD_CLOEXEC

This command duplicates file descriptor with close-on-exec flag set.

Defined in POSIX.1-2008.

* ioselectors_kqueue: don't leak file descriptors

File descriptors internally used by ioselectors on BSD/OSX are now
shielded from leakage.

* posix: add O_CLOEXEC

This flag allows file descriptors to be open() with close-on-exec flag
set atomically.

This flag is specified in POSIX.1-2008

* tfdleak: test for selectors leakage

Also simplified the test by using handle-type agnostic APIs to test for
validity.

* ioselectors_epoll: mark all fd created close-on-exec

File descriptors from ioselectors should no longer leaks on Linux.

* tfdleak: don't check for selector leakage on Windows

The getFd proc for ioselectors_select returns a hardcoded -1

* io: add NoInheritFlag at compile time

* io: add support for ioctl-based close-on-exec

This allows for the flag to be set/unset in one syscall. While the
performance gains might be negliable, we have one less failure point
to deal with.

* tfdleak: add a test for setInheritable

* stdlib: add nimInheritHandles to restore old behaviors

* memfiles: make file handle not inheritable by default for posix

* io: setInheritable now operates on OS file handle

On Windows, the native handle is the only thing that's inheritable, thus
we can assume that users of this function will already have the handle
available to them. This also allows users to pass down file descriptors
from memfiles on Windows with ease, should that be desired.

With this, nativesockets.setInheritable can be made much simpler.

* changelog: clarify

* nativesockets: document setInheritable return value

* posix_utils: atomically disable fd inheritance for mkstemp
2020-04-20 17:09:59 +02:00

879 lines
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Nim
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# Posix detect program
# (c) 2010 Andreas Rumpf
# This program generates:
# * A c program that prints a nim file containing constant variables holding the
# value of many C #define's, on the platform it's currently running at
# * A nim file that contains the same contants, but as nim var:s that fetch the
# value of the constant using importc/header during the C compile phase.
#
# The first file allows nim to know the value of the constant at nim
# compile time, but since the values differ across platform, isn't as portable.
# The second one is more portable, and less semantically correct. It only works
# when there's a backing C compiler available as well, preventing standalone
# compilation.
import os, strutils
const
cc = "gcc -o $# $#.c"
cpp = "gcc -E -o $#.i $#.c"
cfile = """
/* Generated by detect.nim */
#include <stdlib.h>
#include <stdio.h>
$1
int main() {
FILE* f;
f = fopen("$3_$4_consts.nim", "w+");
fputs("# Generated by detect.nim\n\n", f);
$2
fclose(f);
}
"""
ifile = """
/* Generated by detect.nim */
$1
"""
nimfile = """
# Generated by detect.nim
$1
"""
var
cur = ""
found = false
hd = ""
tl = ""
other = ""
proc myExec(cmd: string): bool =
echo "CMD ", cmd
return execShellCmd(cmd) == 0
proc header(s: string) =
cur = s
const testh = "testh"
var f: File
if open(f, addFileExt(testh, "c"), fmWrite):
f.write("#include $1\n" % s)
f.write("int main() { return 0; }\n")
close(f)
found = myExec(cc % [testh.addFileExt(ExeExt), testh])
removeFile(addFileExt(testh, "c"))
addf(other, "\n# $1\n", cur)
if found:
addf(hd, "#include $1\n", cur)
addf(tl, " fprintf(f, \"\\n# $1\\n\");\n", cur)
echo("Found: ", s)
else:
echo("Not found: ", s)
proc main =
const gen = "genconsts"
const pre = "pre"
var f: File
if open(f, addFileExt(gen, "c"), fmWrite):
f.write(cfile % [hd, tl, system.hostOS, system.hostCPU])
close(f)
if open(f, addFileExt(pre, "c"), fmWrite):
f.write(cfile % [hd, tl, system.hostOS, system.hostCPU])
close(f)
if open(f, "other_consts.nim", fmWrite):
f.write(nimfile % [other])
close(f)
if not myExec(cc % [gen.addFileExt(ExeExt), gen]): quit(1)
if not myExec(cpp % [pre.addFileExt(ExeExt), pre]): quit(1)
when defined(windows):
if not myExec(gen.addFileExt(ExeExt)): quit(1)
else:
if not myExec("./" & gen): quit(1)
#removeFile(addFileExt(gen, "c"))
echo("Success")
proc v(name: string, typ = "cint", no_other = false) =
var n = if name[0] == '_': substr(name, 1) else: name
var t = $typ
if not no_other:
addf(other,
"var $1* {.importc: \"$2\", header: \"$3\".}: $4\n", n, name, cur, t)
if not found: return
case typ
of "pointer":
addf(tl,
"#ifdef $3\n fprintf(f, \"const $1* = cast[$2](%p)\\n\", $3);\n#endif\n",
n, t, name)
of "cstring":
addf(tl,
"#ifdef $3\n fprintf(f, \"const $1* = $2(\\\"%s\\\")\\n\", $3);\n#endif\n",
n, t, name)
of "clong":
addf(tl,
"#ifdef $3\n fprintf(f, \"const $1* = $2(%ld)\\n\", $3);\n#endif\n",
n, t, name)
of "cint", "cshort", "InAddrScalar", "TSa_Family":
addf(tl,
"#ifdef $3\n fprintf(f, \"const $1* = $2(%d)\\n\", $3);\n#endif\n",
n, t, name)
else:
addf(tl,
"#ifdef $3\n fprintf(f, \"const $1* = cast[$2](%d)\\n\", $3);\n#endif\n",
n, t, name)
header("<aio.h>")
v("AIO_ALLDONE")
v("AIO_CANCELED")
v("AIO_NOTCANCELED")
v("LIO_NOP")
v("LIO_NOWAIT")
v("LIO_READ")
v("LIO_WAIT")
v("LIO_WRITE")
header("<dlfcn.h>")
v("RTLD_LAZY")
v("RTLD_NOW")
v("RTLD_GLOBAL")
v("RTLD_LOCAL")
header("<errno.h>")
v("E2BIG")
v("EACCES")
v("EADDRINUSE")
v("EADDRNOTAVAIL")
v("EAFNOSUPPORT")
v("EAGAIN")
v("EALREADY")
v("EBADF")
v("EBADMSG")
v("EBUSY")
v("ECANCELED")
v("ECHILD")
v("ECONNABORTED")
v("ECONNREFUSED")
v("ECONNRESET")
v("EDEADLK")
v("EDESTADDRREQ")
v("EDOM")
v("EDQUOT")
v("EEXIST")
v("EFAULT")
v("EFBIG")
v("EHOSTUNREACH")
v("EIDRM")
v("EILSEQ")
v("EINPROGRESS")
v("EINTR")
v("EINVAL")
v("EIO")
v("EISCONN")
v("EISDIR")
v("ELOOP")
v("EMFILE")
v("EMLINK")
v("EMSGSIZE")
v("EMULTIHOP")
v("ENAMETOOLONG")
v("ENETDOWN")
v("ENETRESET")
v("ENETUNREACH")
v("ENFILE")
v("ENOBUFS")
v("ENODATA")
v("ENODEV")
v("ENOENT")
v("ENOEXEC")
v("ENOLCK")
v("ENOLINK")
v("ENOMEM")
v("ENOMSG")
v("ENOPROTOOPT")
v("ENOSPC")
v("ENOSR")
v("ENOSTR")
v("ENOSYS")
v("ENOTCONN")
v("ENOTDIR")
v("ENOTEMPTY")
v("ENOTSOCK")
v("ENOTSUP")
v("ENOTTY")
v("ENXIO")
v("EOPNOTSUPP")
v("EOVERFLOW")
v("EPERM")
v("EPIPE")
v("EPROTO")
v("EPROTONOSUPPORT")
v("EPROTOTYPE")
v("ERANGE")
v("EROFS")
v("ESPIPE")
v("ESRCH")
v("ESTALE")
v("ETIME")
v("ETIMEDOUT")
v("ETXTBSY")
v("EWOULDBLOCK")
v("EXDEV")
header("<fcntl.h>")
v("F_DUPFD")
v("F_DUPFD_CLOEXEC")
v("F_GETFD")
v("F_SETFD")
v("F_GETFL")
v("F_SETFL")
v("F_GETLK")
v("F_SETLK")
v("F_SETLKW")
v("F_GETOWN")
v("F_SETOWN")
v("FD_CLOEXEC")
v("F_RDLCK")
v("F_UNLCK")
v("F_WRLCK")
v("O_CREAT")
v("O_EXCL")
v("O_NOCTTY")
v("O_TRUNC")
v("O_APPEND")
v("O_DSYNC")
v("O_NONBLOCK")
v("O_RSYNC")
v("O_SYNC")
v("O_ACCMODE")
v("O_RDONLY")
v("O_RDWR")
v("O_WRONLY")
v("O_CLOEXEC")
v("POSIX_FADV_NORMAL")
v("POSIX_FADV_SEQUENTIAL")
v("POSIX_FADV_RANDOM")
v("POSIX_FADV_WILLNEED")
v("POSIX_FADV_DONTNEED")
v("POSIX_FADV_NOREUSE")
header("<fenv.h>")
v("FE_DIVBYZERO")
v("FE_INEXACT")
v("FE_INVALID")
v("FE_OVERFLOW")
v("FE_UNDERFLOW")
v("FE_ALL_EXCEPT")
v("FE_DOWNWARD")
v("FE_TONEAREST")
v("FE_TOWARDZERO")
v("FE_UPWARD")
v("FE_DFL_ENV")
header("<fmtmsg.h>")
v("MM_HARD")
v("MM_SOFT")
v("MM_FIRM")
v("MM_APPL")
v("MM_UTIL")
v("MM_OPSYS")
v("MM_RECOVER")
v("MM_NRECOV")
v("MM_HALT")
v("MM_ERROR")
v("MM_WARNING")
v("MM_INFO")
v("MM_NOSEV")
v("MM_PRINT")
v("MM_CONSOLE")
v("MM_OK")
v("MM_NOTOK")
v("MM_NOMSG")
v("MM_NOCON")
header("<fnmatch.h>")
v("FNM_NOMATCH")
v("FNM_PATHNAME")
v("FNM_PERIOD")
v("FNM_NOESCAPE")
v("FNM_NOSYS")
header("<ftw.h>")
v("FTW_F")
v("FTW_D")
v("FTW_DNR")
v("FTW_DP")
v("FTW_NS")
v("FTW_SL")
v("FTW_SLN")
v("FTW_PHYS")
v("FTW_MOUNT")
v("FTW_DEPTH")
v("FTW_CHDIR")
header("<glob.h>")
v("GLOB_APPEND")
v("GLOB_DOOFFS")
v("GLOB_ERR")
v("GLOB_MARK")
v("GLOB_NOCHECK")
v("GLOB_NOESCAPE")
v("GLOB_NOSORT")
v("GLOB_ABORTED")
v("GLOB_NOMATCH")
v("GLOB_NOSPACE")
v("GLOB_NOSYS")
header("<langinfo.h>")
v("CODESET")
v("D_T_FMT")
v("D_FMT")
v("T_FMT")
v("T_FMT_AMPM")
v("AM_STR")
v("PM_STR")
v("DAY_1")
v("DAY_2")
v("DAY_3")
v("DAY_4")
v("DAY_5")
v("DAY_6")
v("DAY_7")
v("ABDAY_1")
v("ABDAY_2")
v("ABDAY_3")
v("ABDAY_4")
v("ABDAY_5")
v("ABDAY_6")
v("ABDAY_7")
v("MON_1")
v("MON_2")
v("MON_3")
v("MON_4")
v("MON_5")
v("MON_6")
v("MON_7")
v("MON_8")
v("MON_9")
v("MON_10")
v("MON_11")
v("MON_12")
v("ABMON_1")
v("ABMON_2")
v("ABMON_3")
v("ABMON_4")
v("ABMON_5")
v("ABMON_6")
v("ABMON_7")
v("ABMON_8")
v("ABMON_9")
v("ABMON_10")
v("ABMON_11")
v("ABMON_12")
v("ERA")
v("ERA_D_FMT")
v("ERA_D_T_FMT")
v("ERA_T_FMT")
v("ALT_DIGITS")
v("RADIXCHAR")
v("THOUSEP")
v("YESEXPR")
v("NOEXPR")
v("CRNCYSTR")
header("<locale.h>")
v("LC_ALL")
v("LC_COLLATE")
v("LC_CTYPE")
v("LC_MESSAGES")
v("LC_MONETARY")
v("LC_NUMERIC")
v("LC_TIME")
header("<netdb.h>")
v("IPPORT_RESERVED")
v("HOST_NOT_FOUND")
v("NO_DATA")
v("NO_RECOVERY")
v("TRY_AGAIN")
v("AI_PASSIVE")
v("AI_CANONNAME")
v("AI_NUMERICHOST")
v("AI_NUMERICSERV")
v("AI_V4MAPPED")
v("AI_ALL")
v("AI_ADDRCONFIG")
v("NI_NOFQDN")
v("NI_NUMERICHOST")
v("NI_NAMEREQD")
v("NI_NUMERICSERV")
v("NI_NUMERICSCOPE")
v("NI_DGRAM")
v("EAI_AGAIN")
v("EAI_BADFLAGS")
v("EAI_FAIL")
v("EAI_FAMILY")
v("EAI_MEMORY")
v("EAI_NONAME")
v("EAI_SERVICE")
v("EAI_SOCKTYPE")
v("EAI_SYSTEM")
v("EAI_OVERFLOW")
header("<net/if.h>")
v("IF_NAMESIZE")
header("<netinet/in.h>")
v("IPPROTO_IP")
v("IPPROTO_IPV6")
v("IPPROTO_ICMP")
v("IPPROTO_RAW")
v("IPPROTO_TCP")
v("IPPROTO_UDP")
v("INADDR_ANY", "InAddrScalar")
v("INADDR_LOOPBACK", "InAddrScalar")
v("INADDR_BROADCAST", "InAddrScalar")
v("INET_ADDRSTRLEN")
v("INET6_ADDRSTRLEN")
v("IPV6_JOIN_GROUP")
v("IPV6_LEAVE_GROUP")
v("IPV6_MULTICAST_HOPS")
v("IPV6_MULTICAST_IF")
v("IPV6_MULTICAST_LOOP")
v("IPV6_UNICAST_HOPS")
v("IPV6_V6ONLY")
header("<netinet/tcp.h>")
v("TCP_NODELAY")
header("<nl_types.h>")
v("NL_SETD")
v("NL_CAT_LOCALE")
header("<poll.h>")
v("POLLIN", "cshort")
v("POLLRDNORM", "cshort")
v("POLLRDBAND", "cshort")
v("POLLPRI", "cshort")
v("POLLOUT", "cshort")
v("POLLWRNORM", "cshort")
v("POLLWRBAND", "cshort")
v("POLLERR", "cshort")
v("POLLHUP", "cshort")
v("POLLNVAL", "cshort")
header("<pthread.h>")
v("PTHREAD_BARRIER_SERIAL_THREAD")
v("PTHREAD_CANCEL_ASYNCHRONOUS")
v("PTHREAD_CANCEL_ENABLE")
v("PTHREAD_CANCEL_DEFERRED")
v("PTHREAD_CANCEL_DISABLE")
#v("PTHREAD_CANCELED")
#v("PTHREAD_COND_INITIALIZER")
v("PTHREAD_CREATE_DETACHED")
v("PTHREAD_CREATE_JOINABLE")
v("PTHREAD_EXPLICIT_SCHED")
v("PTHREAD_INHERIT_SCHED")
v("PTHREAD_MUTEX_DEFAULT")
v("PTHREAD_MUTEX_ERRORCHECK")
#v("PTHREAD_MUTEX_INITIALIZER")
v("PTHREAD_MUTEX_NORMAL")
v("PTHREAD_MUTEX_RECURSIVE")
#v("PTHREAD_ONCE_INIT")
v("PTHREAD_PRIO_INHERIT")
v("PTHREAD_PRIO_NONE")
v("PTHREAD_PRIO_PROTECT")
v("PTHREAD_PROCESS_SHARED")
v("PTHREAD_PROCESS_PRIVATE")
v("PTHREAD_SCOPE_PROCESS")
v("PTHREAD_SCOPE_SYSTEM")
header("<sched.h>")
v("SCHED_FIFO")
v("SCHED_RR")
v("SCHED_SPORADIC")
v("SCHED_OTHER")
header("<semaphore.h>")
v("SEM_FAILED", "pointer")
header("<signal.h>")
v("SIGEV_NONE")
v("SIGEV_SIGNAL")
v("SIGEV_THREAD")
v("SIGABRT")
v("SIGALRM")
v("SIGBUS")
v("SIGCHLD")
v("SIGCONT")
v("SIGFPE")
v("SIGHUP")
v("SIGILL")
v("SIGINT")
v("SIGKILL")
v("SIGPIPE")
v("SIGQUIT")
v("SIGSEGV")
v("SIGSTOP")
v("SIGTERM")
v("SIGTSTP")
v("SIGTTIN")
v("SIGTTOU")
v("SIGUSR1")
v("SIGUSR2")
v("SIGPOLL")
v("SIGPROF")
v("SIGSYS")
v("SIGTRAP")
v("SIGURG")
v("SIGVTALRM")
v("SIGXCPU")
v("SIGXFSZ")
v("SA_NOCLDSTOP")
v("SIG_BLOCK")
v("SIG_UNBLOCK")
v("SIG_SETMASK")
v("SA_ONSTACK")
v("SA_RESETHAND")
v("SA_RESTART")
v("SA_SIGINFO")
v("SA_NOCLDWAIT")
v("SA_NODEFER")
v("SS_ONSTACK")
v("SS_DISABLE")
v("MINSIGSTKSZ")
v("SIGSTKSZ")
v("SIG_HOLD", "Sighandler")
v("SIG_DFL", "Sighandler")
v("SIG_ERR", "Sighandler")
v("SIG_IGN", "Sighandler")
header("<sys/ipc.h>")
v("IPC_CREAT")
v("IPC_EXCL")
v("IPC_NOWAIT")
v("IPC_PRIVATE")
v("IPC_RMID")
v("IPC_SET")
v("IPC_STAT")
header("<sys/mman.h>")
v("PROT_READ")
v("PROT_WRITE")
v("PROT_EXEC")
v("PROT_NONE")
v("MAP_ANONYMOUS")
v("MAP_FIXED_NOREPLACE")
v("MAP_NORESERVE")
v("MAP_SHARED")
v("MAP_PRIVATE")
v("MAP_FIXED")
v("MS_ASYNC")
v("MS_SYNC")
v("MS_INVALIDATE")
v("MCL_CURRENT")
v("MCL_FUTURE")
v("MAP_FAILED", "pointer")
v("POSIX_MADV_NORMAL")
v("POSIX_MADV_SEQUENTIAL")
v("POSIX_MADV_RANDOM")
v("POSIX_MADV_WILLNEED")
v("POSIX_MADV_DONTNEED")
v("POSIX_TYPED_MEM_ALLOCATE")
v("POSIX_TYPED_MEM_ALLOCATE_CONTIG")
v("POSIX_TYPED_MEM_MAP_ALLOCATABLE")
v("MAP_POPULATE", no_other = true)
header("<sys/resource.h>")
v("RLIMIT_NOFILE")
header("<sys/select.h>")
v("FD_SETSIZE")
header("<sys/socket.h>")
v("MSG_CTRUNC")
v("MSG_DONTROUTE")
v("MSG_EOR")
v("MSG_OOB")
v("SCM_RIGHTS")
v("SO_ACCEPTCONN")
v("SO_BROADCAST")
v("SO_DEBUG")
v("SO_DONTROUTE")
v("SO_ERROR")
v("SO_KEEPALIVE")
v("SO_LINGER")
v("SO_OOBINLINE")
v("SO_RCVBUF")
v("SO_RCVLOWAT")
v("SO_RCVTIMEO")
v("SO_REUSEADDR")
v("SO_SNDBUF")
v("SO_SNDLOWAT")
v("SO_SNDTIMEO")
v("SO_TYPE")
v("SOCK_DGRAM")
v("SOCK_RAW")
v("SOCK_SEQPACKET")
v("SOCK_STREAM")
v("SOCK_CLOEXEC", no_other = true)
v("SOL_SOCKET")
v("SOMAXCONN")
v("SO_REUSEPORT", no_other = true)
v("MSG_NOSIGNAL", no_other = true)
v("MSG_PEEK")
v("MSG_TRUNC")
v("MSG_WAITALL")
v("AF_INET", "TSa_Family")
v("AF_INET6", "TSa_Family")
v("AF_UNIX", "TSa_Family")
v("AF_UNSPEC", "TSa_Family")
v("SHUT_RD")
v("SHUT_RDWR")
v("SHUT_WR")
header("<sys/stat.h>")
v("S_IFBLK")
v("S_IFCHR")
v("S_IFDIR")
v("S_IFIFO")
v("S_IFLNK")
v("S_IFMT")
v("S_IFREG")
v("S_IFSOCK")
v("S_IRGRP")
v("S_IROTH")
v("S_IRUSR")
v("S_IRWXG")
v("S_IRWXO")
v("S_IRWXU")
v("S_ISGID")
v("S_ISUID")
v("S_ISVTX")
v("S_IWGRP")
v("S_IWOTH")
v("S_IWUSR")
v("S_IXGRP")
v("S_IXOTH")
v("S_IXUSR")
header("<sys/statvfs.h>")
v("ST_RDONLY")
v("ST_NOSUID")
header("<sys/wait.h>")
v("WNOHANG")
v("WUNTRACED")
#v("WEXITSTATUS")
#v("WSTOPSIG")
#v("WTERMSIG")
v("WEXITED")
v("WSTOPPED")
v("WCONTINUED")
v("WNOWAIT")
v("P_ALL")
v("P_PID")
v("P_PGID")
header("<spawn.h>")
v("POSIX_SPAWN_RESETIDS")
v("POSIX_SPAWN_SETPGROUP")
v("POSIX_SPAWN_SETSCHEDPARAM")
v("POSIX_SPAWN_SETSCHEDULER")
v("POSIX_SPAWN_SETSIGDEF")
v("POSIX_SPAWN_SETSIGMASK")
v("POSIX_SPAWN_USEVFORK", no_other = true)
header("<stdio.h>")
v("_IOFBF")
v("_IONBF")
header("<time.h>")
v("CLOCKS_PER_SEC", "clong")
v("CLOCK_PROCESS_CPUTIME_ID")
v("CLOCK_THREAD_CPUTIME_ID")
v("CLOCK_REALTIME")
v("TIMER_ABSTIME")
v("CLOCK_MONOTONIC")
header("<unistd.h>")
v("_POSIX_ASYNC_IO")
v("_POSIX_PRIO_IO")
v("_POSIX_SYNC_IO")
v("F_OK")
v("R_OK")
v("W_OK")
v("X_OK")
v("_CS_PATH")
v("_CS_POSIX_V6_ILP32_OFF32_CFLAGS")
v("_CS_POSIX_V6_ILP32_OFF32_LDFLAGS")
v("_CS_POSIX_V6_ILP32_OFF32_LIBS")
v("_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS")
v("_CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS")
v("_CS_POSIX_V6_ILP32_OFFBIG_LIBS")
v("_CS_POSIX_V6_LP64_OFF64_CFLAGS")
v("_CS_POSIX_V6_LP64_OFF64_LDFLAGS")
v("_CS_POSIX_V6_LP64_OFF64_LIBS")
v("_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS")
v("_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS")
v("_CS_POSIX_V6_LPBIG_OFFBIG_LIBS")
v("_CS_POSIX_V6_WIDTH_RESTRICTED_ENVS")
v("F_LOCK")
v("F_TEST")
v("F_TLOCK")
v("F_ULOCK")
v("_PC_2_SYMLINKS")
v("_PC_ALLOC_SIZE_MIN")
v("_PC_ASYNC_IO")
v("_PC_CHOWN_RESTRICTED")
v("_PC_FILESIZEBITS")
v("_PC_LINK_MAX")
v("_PC_MAX_CANON")
v("_PC_MAX_INPUT")
v("_PC_NAME_MAX")
v("_PC_NO_TRUNC")
v("_PC_PATH_MAX")
v("_PC_PIPE_BUF")
v("_PC_PRIO_IO")
v("_PC_REC_INCR_XFER_SIZE")
v("_PC_REC_MIN_XFER_SIZE")
v("_PC_REC_XFER_ALIGN")
v("_PC_SYMLINK_MAX")
v("_PC_SYNC_IO")
v("_PC_VDISABLE")
v("_SC_2_C_BIND")
v("_SC_2_C_DEV")
v("_SC_2_CHAR_TERM")
v("_SC_2_FORT_DEV")
v("_SC_2_FORT_RUN")
v("_SC_2_LOCALEDEF")
v("_SC_2_PBS")
v("_SC_2_PBS_ACCOUNTING")
v("_SC_2_PBS_CHECKPOINT")
v("_SC_2_PBS_LOCATE")
v("_SC_2_PBS_MESSAGE")
v("_SC_2_PBS_TRACK")
v("_SC_2_SW_DEV")
v("_SC_2_UPE")
v("_SC_2_VERSION")
v("_SC_ADVISORY_INFO")
v("_SC_AIO_LISTIO_MAX")
v("_SC_AIO_MAX")
v("_SC_AIO_PRIO_DELTA_MAX")
v("_SC_ARG_MAX")
v("_SC_ASYNCHRONOUS_IO")
v("_SC_ATEXIT_MAX")
v("_SC_BARRIERS")
v("_SC_BC_BASE_MAX")
v("_SC_BC_DIM_MAX")
v("_SC_BC_SCALE_MAX")
v("_SC_BC_STRING_MAX")
v("_SC_CHILD_MAX")
v("_SC_CLK_TCK")
v("_SC_CLOCK_SELECTION")
v("_SC_COLL_WEIGHTS_MAX")
v("_SC_CPUTIME")
v("_SC_DELAYTIMER_MAX")
v("_SC_EXPR_NEST_MAX")
v("_SC_FSYNC")
v("_SC_GETGR_R_SIZE_MAX")
v("_SC_GETPW_R_SIZE_MAX")
v("_SC_HOST_NAME_MAX")
v("_SC_IOV_MAX")
v("_SC_IPV6")
v("_SC_JOB_CONTROL")
v("_SC_LINE_MAX")
v("_SC_LOGIN_NAME_MAX")
v("_SC_MAPPED_FILES")
v("_SC_MEMLOCK")
v("_SC_MEMLOCK_RANGE")
v("_SC_MEMORY_PROTECTION")
v("_SC_MESSAGE_PASSING")
v("_SC_MONOTONIC_CLOCK")
v("_SC_MQ_OPEN_MAX")
v("_SC_MQ_PRIO_MAX")
v("_SC_NGROUPS_MAX")
v("_SC_OPEN_MAX")
v("_SC_PAGESIZE") # Synonym for _SC_PAGE_SIZE
v("_SC_PRIORITIZED_IO")
v("_SC_PRIORITY_SCHEDULING")
v("_SC_RAW_SOCKETS")
v("_SC_RE_DUP_MAX")
v("_SC_READER_WRITER_LOCKS")
v("_SC_REALTIME_SIGNALS")
v("_SC_REGEXP")
v("_SC_RTSIG_MAX")
v("_SC_SAVED_IDS")
v("_SC_SEM_NSEMS_MAX")
v("_SC_SEM_VALUE_MAX")
v("_SC_SEMAPHORES")
v("_SC_SHARED_MEMORY_OBJECTS")
v("_SC_SHELL")
v("_SC_SIGQUEUE_MAX")
v("_SC_SPAWN")
v("_SC_SPIN_LOCKS")
v("_SC_SPORADIC_SERVER")
v("_SC_SS_REPL_MAX")
v("_SC_STREAM_MAX")
v("_SC_SYMLOOP_MAX")
v("_SC_SYNCHRONIZED_IO")
v("_SC_THREAD_ATTR_STACKADDR")
v("_SC_THREAD_ATTR_STACKSIZE")
v("_SC_THREAD_CPUTIME")
v("_SC_THREAD_DESTRUCTOR_ITERATIONS")
v("_SC_THREAD_KEYS_MAX")
v("_SC_THREAD_PRIO_INHERIT")
v("_SC_THREAD_PRIO_PROTECT")
v("_SC_THREAD_PRIORITY_SCHEDULING")
v("_SC_THREAD_PROCESS_SHARED")
v("_SC_THREAD_SAFE_FUNCTIONS")
v("_SC_THREAD_SPORADIC_SERVER")
v("_SC_THREAD_STACK_MIN")
v("_SC_THREAD_THREADS_MAX")
v("_SC_THREADS")
v("_SC_TIMEOUTS")
v("_SC_TIMER_MAX")
v("_SC_TIMERS")
v("_SC_TRACE")
v("_SC_TRACE_EVENT_FILTER")
v("_SC_TRACE_EVENT_NAME_MAX")
v("_SC_TRACE_INHERIT")
v("_SC_TRACE_LOG")
v("_SC_TRACE_NAME_MAX")
v("_SC_TRACE_SYS_MAX")
v("_SC_TRACE_USER_EVENT_MAX")
v("_SC_TTY_NAME_MAX")
v("_SC_TYPED_MEMORY_OBJECTS")
v("_SC_TZNAME_MAX")
v("_SC_V6_ILP32_OFF32")
v("_SC_V6_ILP32_OFFBIG")
v("_SC_V6_LP64_OFF64")
v("_SC_V6_LPBIG_OFFBIG")
v("_SC_VERSION")
v("_SC_XBS5_ILP32_OFF32")
v("_SC_XBS5_ILP32_OFFBIG")
v("_SC_XBS5_LP64_OFF64")
v("_SC_XBS5_LPBIG_OFFBIG")
v("_SC_XOPEN_CRYPT")
v("_SC_XOPEN_ENH_I18N")
v("_SC_XOPEN_LEGACY")
v("_SC_XOPEN_REALTIME")
v("_SC_XOPEN_REALTIME_THREADS")
v("_SC_XOPEN_SHM")
v("_SC_XOPEN_STREAMS")
v("_SC_XOPEN_UNIX")
v("_SC_XOPEN_VERSION")
v("_SC_NPROCESSORS_ONLN")
v("SEEK_SET")
v("SEEK_CUR")
v("SEEK_END")
main()
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