Nintendo switch support (#8069)

* Add config section for Nintendo Switch
* Add compiler configuration for Nintendo Switch and it's CPU
* Add specific lib code for Nintendo Switch
* Add GC support for Nintendo Switch
* Update changelog for Nintendo Switch
* Update changelog with more info about fixed paths
* Cleaned up GC memory management a bit
* Relocate docs for Switch
* Rename aarch64NoneElfGcc to nintendoSwitchGCC
* Remove armv8a57
* Fix installer.ini
* Reuse code in linux and amd64
* Add posix defs for nintendo switch
* Add more defined sections for nintendo switch
* Remove old comment
* Add what's not supported for Nintendo Switch docs
* Make nintendoswitch == posix
* Remove DEVKITPRO references from nim.cfg
* Make PR extccomp changes
* Remove Result type alias
* Add separate switch consts file
* Update docs for nintendo switch
* Fix travis errors with undefined consts and add correct wait.h procs

1 files changed, 506 insertions, 0 deletions

diff --git a/lib/posix/posix_nintendoswitch.nim b/lib/posix/posix_nintendoswitch.nim
new file mode 100644
index 000000000..892ea3370
--- /dev/null
+++ b/lib/posix/posix_nintendoswitch.nim
@@ -0,0 +1,506 @@
+#
+#
+#            Nim's Runtime Library
+#        (c) Copyright 2018 Joey Yakimowich-Payne
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+# To be included from posix.nim!
+
+const
+  hasSpawnH = true
+  hasAioH = false
+
+type
+  DIR* {.importc: "DIR", header: "<dirent.h>",
+          incompleteStruct.} = object
+
+const SIG_HOLD* = cast[SigHandler](2)
+
+type
+  SocketHandle* = distinct cint # The type used to represent socket descriptors
+
+type
+  Time* {.importc: "time_t", header: "<time.h>".} = distinct clong
+
+  Timespec* {.importc: "struct timespec",
+               header: "<time.h>", final, pure.} = object ## struct timespec
+    tv_sec*: Time  ## Seconds.
+    tv_nsec*: clong  ## Nanoseconds.
+
+  Dirent* {.importc: "struct dirent",
+            header: "<dirent.h>", final, pure.} = object ## dirent_t struct
+    d_ino*: Ino
+    d_type*: int8  # cuchar really!
+    d_name*: array[256, cchar]
+
+  Tflock* {.importc: "struct flock", final, pure,
+            header: "<fcntl.h>".} = object ## flock type
+    l_type*: cshort   ## Type of lock; F_RDLCK, F_WRLCK, F_UNLCK.
+    l_whence*: cshort ## Flag for starting offset.
+    l_start*: Off     ## Relative offset in bytes.
+    l_len*: Off       ## Size; if 0 then until EOF.
+    l_pid*: Pid      ## Process ID of the process holding the lock;
+                      ## returned with F_GETLK.
+
+  # no struct FTW on linux
+
+  Glob* {.importc: "glob_t", header: "<glob.h>",
+           final, pure.} = object ## glob_t
+    gl_pathc*: cint          ## Count of paths matched by pattern.
+    gl_matchc*: cint          ## Count of paths matching pattern
+    gl_offs*: cint           ## Slots to reserve at the beginning of gl_pathv.
+    gl_flags*: cint
+    gl_pathv*: cstringArray ## Pointer to a list of matched pathnames.
+    gl_errfunc*: pointer
+    gl_closedir*: pointer
+    gl_readdir*: pointer
+    gl_opendir*: pointer
+    gl_lstat*: pointer
+    gl_stat*: pointer
+
+  Group* {.importc: "struct group", header: "<grp.h>",
+            final, pure.} = object ## struct group
+    gr_name*: cstring     ## The name of the group.
+    gr_passwd*: cstring
+    gr_gid*: Gid         ## Numerical group ID.
+    gr_mem*: cstringArray ## Pointer to a null-terminated array of character
+                          ## pointers to member names.
+
+  Iconv* {.importc: "iconv_t", header: "<iconv.h>".} = pointer
+     ## Identifies the conversion from one codeset to another.
+
+  Lconv* {.importc: "struct lconv", header: "<locale.h>", final,
+            pure.} = object
+    decimal_point*: cstring
+    thousands_sep*: cstring
+    grouping*: cstring
+    int_curr_symbol*: cstring
+    currency_symbol*: cstring
+    mon_decimal_point*: cstring
+    mon_thousands_sep*: cstring
+    mon_grouping*: cstring
+    positive_sign*: cstring
+    negative_sign*: cstring
+    int_frac_digits*: char
+    frac_digits*: char
+    p_cs_precedes*: char
+    p_sep_by_space*: char
+    n_cs_precedes*: char
+    n_sep_by_space*: char
+    p_sign_posn*: char
+    n_sign_posn*: char
+    int_n_cs_precedes*: char
+    int_n_sep_by_space*: char
+    int_n_sign_posn*: char
+    int_p_cs_precedes*: char
+    int_p_sep_by_space*: char
+    int_p_sign_posn*: char
+
+  Passwd* {.importc: "struct passwd", header: "<pwd.h>",
+             final, pure.} = object ## struct passwd
+    pw_name*: cstring   ## User's login name.
+    pw_passwd*: cstring
+    pw_uid*: Uid        ## Numerical user ID.
+    pw_gid*: Gid        ## Numerical group ID.
+    pw_comment*: cstring
+    pw_gecos*: cstring
+    pw_dir*: cstring    ## Initial working directory.
+    pw_shell*: cstring  ## Program to use as shell.
+
+  Blkcnt* {.importc: "blkcnt_t", header: "<sys/types.h>".} = clong
+    ## used for file block counts
+  Blksize* {.importc: "blksize_t", header: "<sys/types.h>".} = clong
+    ## used for block sizes
+  Clock* {.importc: "clock_t", header: "<sys/types.h>".} = clong
+  ClockId* {.importc: "clockid_t", header: "<sys/types.h>".} = cint
+  Dev* {.importc: "dev_t", header: "<sys/types.h>".} = culong
+  Fsblkcnt* {.importc: "fsblkcnt_t", header: "<sys/types.h>".} = culong
+  Fsfilcnt* {.importc: "fsfilcnt_t", header: "<sys/types.h>".} = culong
+  Gid* {.importc: "gid_t", header: "<sys/types.h>".} = cuint
+  Id* {.importc: "id_t", header: "<sys/types.h>".} = cuint
+  Ino* {.importc: "ino_t", header: "<sys/types.h>".} = culong
+  Key* {.importc: "key_t", header: "<sys/types.h>".} = cint
+  Mode* {.importc: "mode_t", header: "<sys/types.h>".} = cint # cuint really!
+  Nlink* {.importc: "nlink_t", header: "<sys/types.h>".} = culong
+  Off* {.importc: "off_t", header: "<sys/types.h>".} = clong
+  Pid* {.importc: "pid_t", header: "<sys/types.h>".} = cint
+  Pthread_attr* {.importc: "pthread_attr_t", header: "<sys/types.h>",
+                  pure, final.} = object
+    abi: array[56 div sizeof(clong), clong]
+
+  Pthread_barrier* {.importc: "pthread_barrier_t",
+                      header: "<sys/types.h>", pure, final.} = object
+    abi: array[32 div sizeof(clong), clong]
+  Pthread_barrierattr* {.importc: "pthread_barrierattr_t",
+                          header: "<sys/types.h>", pure, final.} = object
+    abi: array[4 div sizeof(cint), cint]
+
+  Pthread_cond* {.importc: "pthread_cond_t", header: "<sys/types.h>",
+                  pure, final.} = object
+    abi: array[48 div sizeof(clonglong), clonglong]
+  Pthread_condattr* {.importc: "pthread_condattr_t",
+                       header: "<sys/types.h>", pure, final.} = object
+    abi: array[4 div sizeof(cint), cint]
+  Pthread_key* {.importc: "pthread_key_t", header: "<sys/types.h>".} = cuint
+  Pthread_mutex* {.importc: "pthread_mutex_t", header: "<sys/types.h>",
+                   pure, final.} = object
+    abi: array[48 div sizeof(clong), clong]
+  Pthread_mutexattr* {.importc: "pthread_mutexattr_t",
+                        header: "<sys/types.h>", pure, final.} = object
+    abi: array[4 div sizeof(cint), cint]
+  Pthread_once* {.importc: "pthread_once_t", header: "<sys/types.h>".} = cint
+  Pthread_rwlock* {.importc: "pthread_rwlock_t",
+                     header: "<sys/types.h>", pure, final.} = object
+    abi: array[56 div sizeof(clong), clong]
+  Pthread_rwlockattr* {.importc: "pthread_rwlockattr_t",
+                         header: "<sys/types.h>".} = object
+    abi: array[8 div sizeof(clong), clong]
+  Pthread_spinlock* {.importc: "pthread_spinlock_t",
+                       header: "<sys/types.h>".} = cint
+  Pthread* {.importc: "pthread_t", header: "<sys/types.h>".} = culong
+  Suseconds* {.importc: "suseconds_t", header: "<sys/types.h>".} = clong
+  #Ttime* {.importc: "time_t", header: "<sys/types.h>".} = int
+  Timer* {.importc: "timer_t", header: "<sys/types.h>".} = pointer
+  Uid* {.importc: "uid_t", header: "<sys/types.h>".} = cuint
+  Useconds* {.importc: "useconds_t", header: "<sys/types.h>".} = cuint
+
+  Utsname* {.importc: "struct utsname",
+              header: "<sys/utsname.h>",
+              final, pure.} = object ## struct utsname
+    sysname*,      ## Name of this implementation of the operating system.
+      nodename*,   ## Name of this node within the communications
+                   ## network to which this node is attached, if any.
+      release*,    ## Current release level of this implementation.
+      version*,    ## Current version level of this release.
+      machine*,    ## Name of the hardware type on which the
+                   ## system is running.
+      domainname*: array[65, char]
+
+  Sem* {.importc: "sem_t", header: "<semaphore.h>", final, pure.} = object
+    abi: array[32 div sizeof(clong), clong]
+
+  Stat* {.importc: "struct stat",
+           header: "<sys/stat.h>", final, pure.} = object ## struct stat
+    st_dev*: Dev          ## Device ID of device containing file.
+    st_ino*: Ino          ## File serial number.
+    st_mode*: Mode        ## Mode of file (see below).
+    st_nlink*: Nlink      ## Number of hard links to the file.
+    st_uid*: Uid          ## User ID of file.
+    st_gid*: Gid          ## Group ID of file.
+    st_rdev*: Dev         ## Device ID (if file is character or block special).
+    st_size*: Off         ## For regular files, the file size in bytes.
+                           ## For symbolic links, the length in bytes of the
+                           ## pathname contained in the symbolic link.
+                           ## For a shared memory object, the length in bytes.
+                           ## For a typed memory object, the length in bytes.
+                           ## For other file types, the use of this field is
+                           ## unspecified.
+    when StatHasNanoseconds:
+      st_atim*: Timespec  ## Time of last access.
+      pad1: clong
+      st_mtim*: Timespec  ## Time of last data modification.
+      pad2: clong
+      st_ctim*: Timespec  ## Time of last status change.
+      pad3: clong
+    else:
+      st_atime*: Time     ## Time of last access.
+      pad1: clong
+      st_mtime*: Time     ## Time of last data modification.
+      pad2: clong
+      st_ctime*: Time     ## Time of last status change.
+      pad3: clong
+    st_blksize*: Blksize   ## A file system-specific preferred I/O block size
+                           ## for this object. In some file system types, this
+                           ## may vary from file to file.
+    st_blocks*: Blkcnt     ## Number of blocks allocated for this object.
+    reserved: array[2, clong]
+
+  
+
+  Statvfs* {.importc: "struct statvfs", header: "<sys/statvfs.h>",
+              final, pure.} = object ## struct statvfs
+    f_bsize*: culong        ## File system block size.
+    f_frsize*: culong       ## Fundamental file system block size.
+    f_blocks*: Fsblkcnt  ## Total number of blocks on file system
+                         ## in units of f_frsize.
+    f_bfree*: Fsblkcnt   ## Total number of free blocks.
+    f_bavail*: Fsblkcnt  ## Number of free blocks available to
+                         ## non-privileged process.
+    f_files*: Fsfilcnt   ## Total number of file serial numbers.
+    f_ffree*: Fsfilcnt   ## Total number of free file serial numbers.
+    f_favail*: Fsfilcnt  ## Number of file serial numbers available to
+                         ## non-privileged process.
+    f_fsid*: culong         ## File system ID.
+    f_flag*: culong         ## Bit mask of f_flag values.
+    f_namemax*: culong      ## Maximum filename length.
+
+  # No Posix_typed_mem_info
+
+  Tm* {.importc: "struct tm", header: "<time.h>",
+         final, pure.} = object ## struct tm
+    tm_sec*: cint   ## Seconds [0,60].
+    tm_min*: cint   ## Minutes [0,59].
+    tm_hour*: cint  ## Hour [0,23].
+    tm_mday*: cint  ## Day of month [1,31].
+    tm_mon*: cint   ## Month of year [0,11].
+    tm_year*: cint  ## Years since 1900.
+    tm_wday*: cint  ## Day of week [0,6] (Sunday =0).
+    tm_yday*: cint  ## Day of year [0,365].
+    tm_isdst*: cint ## Daylight Savings flag.
+
+  Itimerspec* {.importc: "struct itimerspec", header: "<time.h>",
+                 final, pure.} = object ## struct itimerspec
+    it_interval*: Timespec  ## Timer period.
+    it_value*: Timespec     ## Timer expiration.
+
+  Sig_atomic* {.importc: "sig_atomic_t", header: "<signal.h>".} = cint
+    ## Possibly volatile-qualified integer type of an object that can be
+    ## accessed as an atomic entity, even in the presence of asynchronous
+    ## interrupts.
+  Sigset* {.importc: "sigset_t", header: "<signal.h>", final.} = culong
+
+  SigEvent* {.importc: "struct sigevent",
+               header: "<signal.h>", final, pure.} = object ## struct sigevent
+    sigev_notify*: cint           ## Notification type.
+    sigev_signo*: cint            ## Signal number.
+    sigev_value*: SigVal          ## Signal value.
+
+  SigVal* {.importc: "union sigval",
+             header: "<signal.h>", final, pure.} = object ## struct sigval
+    sival_int*: cint    ## integer signal value
+    sival_ptr*: pointer ## pointer signal value;
+
+  Sigaction* {.importc: "struct sigaction",
+                header: "<signal.h>", final, pure.} = object ## struct sigaction
+    sa_handler*: proc (x: cint) {.noconv.}  ## Pointer to a signal-catching
+                                            ## function or one of the macros
+                                            ## SIG_IGN or SIG_DFL.
+    sa_mask*: Sigset ## Set of signals to be blocked during execution of
+                      ## the signal handling function.
+    sa_flags*: cint   ## Special flags.
+
+  Stack* {.importc: "stack_t",
+            header: "<signal.h>", final, pure.} = object ## stack_t
+    ss_sp*: pointer  ## Stack base or pointer.
+    ss_flags*: cint  ## Flags.
+    ss_size*: csize  ## Stack size.
+
+  SigInfo* {.importc: "siginfo_t",
+              header: "<signal.h>", final, pure.} = object ## siginfo_t
+    si_signo*: cint    ## Signal number.
+    si_code*: cint     ## Signal code.
+    si_value*: SigVal  ## Signal value.
+
+  Nl_item* {.importc: "nl_item", header: "<langinfo.h>".} = cint
+
+  Sched_param* {.importc: "struct sched_param",
+                  header: "<sched.h>",
+                  final, pure.} = object ## struct sched_param
+    sched_priority*: cint
+
+  Timeval* {.importc: "struct timeval", header: "<sys/select.h>",
+             final, pure.} = object ## struct timeval
+    tv_sec*: Time       ## Seconds.
+    tv_usec*: Suseconds ## Microseconds.
+  TFdSet* {.importc: "fd_set", header: "<sys/select.h>",
+           final, pure.} = object
+    abi: array[((64+(sizeof(clong) * 8)-1) div (sizeof(clong) * 8)), clong]
+
+proc si_pid*(info: SigInfo): Pid =
+  ## This might not be correct behavior. si_pid doesn't exist in Switch's
+  ## devkitpro headers
+  raise newException(OSError, "Nintendo switch cannot get si_pid!")
+
+type
+  Taiocb* {.importc: "struct aiocb", header: "<aio.h>",
+            final, pure.} = object ## struct aiocb
+    aio_fildes*: cint         ## File descriptor.
+    aio_lio_opcode*: cint     ## Operation to be performed.
+    aio_reqprio*: cint        ## Request priority offset.
+    aio_buf*: pointer         ## Location of buffer.
+    aio_nbytes*: csize        ## Length of transfer.
+    aio_sigevent*: SigEvent   ## Signal number and value.
+    next_prio: pointer
+    abs_prio: cint
+    policy: cint
+    error_Code: cint
+    return_value: clong
+    aio_offset*: Off          ## File offset.
+    reserved: array[32, uint8]
+
+type
+  Tposix_spawnattr* {.importc: "posix_spawnattr_t",
+                      header: "<spawn.h>", final, pure.} = object
+  Tposix_spawn_file_actions* {.importc: "posix_spawn_file_actions_t",
+                               header: "<spawn.h>", final, pure.} = object
+
+# from sys/un.h
+const Sockaddr_un_path_length* = 108
+
+type
+  Socklen* {.importc: "socklen_t", header: "<sys/socket.h>".} = cuint
+  # cushort really
+  TSa_Family* {.importc: "sa_family_t", header: "<sys/socket.h>".} = cshort
+
+  SockAddr* {.importc: "struct sockaddr", header: "<sys/socket.h>",
+              pure, final.} = object ## struct sockaddr
+    sa_len: cuchar
+    sa_family*: TSa_Family         ## Address family.
+    sa_data*: array[14, char] ## Socket address (variable-length data).
+
+  Sockaddr_storage* {.importc: "struct sockaddr_storage",
+                       header: "<sys/socket.h>",
+                       pure, final.} = object ## struct sockaddr_storage
+    ss_len: cuchar
+    ss_family*: TSa_Family ## Address family.
+    ss_padding1: array[64 - sizeof(cuchar) - sizeof(cshort), char]
+    ss_align: clonglong
+    ss_padding2: array[
+      128 - sizeof(cuchar) - sizeof(cshort) -
+      (64 - sizeof(cuchar) - sizeof(cshort)) - 64, char]
+
+  Tif_nameindex* {.importc: "struct if_nameindex", final,
+                   pure, header: "<net/if.h>".} = object ## struct if_nameindex
+    if_index*: cuint   ## Numeric index of the interface.
+    if_name*: cstring ## Null-terminated name of the interface.
+
+
+  IOVec* {.importc: "struct iovec", pure, final,
+            header: "<sys/socket.h>".} = object ## struct iovec
+    iov_base*: pointer ## Base address of a memory region for input or output.
+    iov_len*: csize    ## The size of the memory pointed to by iov_base.
+
+  Tmsghdr* {.importc: "struct msghdr", pure, final,
+             header: "<sys/socket.h>".} = object  ## struct msghdr
+    msg_name*: pointer  ## Optional address.
+    msg_namelen*: Socklen  ## Size of address.
+    msg_iov*: ptr IOVec    ## Scatter/gather array.
+    msg_iovlen*: csize   ## Members in msg_iov.
+    msg_control*: pointer  ## Ancillary data; see below.
+    msg_controllen*: csize ## Ancillary data buffer len.
+    msg_flags*: cint ## Flags on received message.
+
+
+  Tcmsghdr* {.importc: "struct cmsghdr", pure, final,
+              header: "<sys/socket.h>".} = object ## struct cmsghdr
+    cmsg_len*: csize ## Data byte count, including the cmsghdr.
+    cmsg_level*: cint   ## Originating protocol.
+    cmsg_type*: cint    ## Protocol-specific type.
+
+  TLinger* {.importc: "struct linger", pure, final,
+             header: "<sys/socket.h>".} = object ## struct linger
+    l_onoff*: cint  ## Indicates whether linger option is enabled.
+    l_linger*: cint ## Linger time, in seconds.
+    # data follows...
+
+  InPort* = uint16
+  InAddrScalar* = uint32
+
+  InAddrT* {.importc: "in_addr_t", pure, final,
+             header: "<netinet/in.h>".} = uint32
+
+  InAddr* {.importc: "struct in_addr", pure, final,
+             header: "<netinet/in.h>".} = object ## struct in_addr
+    s_addr*: InAddrScalar
+
+  Sockaddr_in* {.importc: "struct sockaddr_in", pure, final,
+                  header: "<netinet/in.h>".} = object ## struct sockaddr_in
+    sin_len*: cushort
+    sin_family*: TSa_Family ## AF_INET.
+    sin_port*: InPort      ## Port number.
+    sin_addr*: InAddr      ## IP address.
+    sin_zero: array[8, uint8]
+
+  In6Addr* {.importc: "struct in6_addr", pure, final,
+              header: "<netinet/in.h>".} = object ## struct in6_addr
+    s6_addr*: array[0..15, char]
+
+  Sockaddr_in6* {.importc: "struct sockaddr_in6", pure, final,
+                   header: "<netinet/in.h>".} = object ## struct sockaddr_in6
+    sin6_family*: TSa_Family ## AF_INET6.
+    sin6_port*: InPort      ## Port number.
+    sin6_flowinfo*: uint32    ## IPv6 traffic class and flow information.
+    sin6_addr*: In6Addr     ## IPv6 address.
+    sin6_scope_id*: uint32    ## Set of interfaces for a scope.
+
+  Hostent* {.importc: "struct hostent", pure, final,
+              header: "<netdb.h>".} = object ## struct hostent
+    h_name*: cstring           ## Official name of the host.
+    h_aliases*: cstringArray   ## A pointer to an array of pointers to
+                               ## alternative host names, terminated by a
+                               ## null pointer.
+    h_addrtype*: cint          ## Address type.
+    h_length*: cint            ## The length, in bytes, of the address.
+    h_addr_list*: cstringArray ## A pointer to an array of pointers to network
+                               ## addresses (in network byte order) for the
+                               ## host, terminated by a null pointer.
+
+  Tnetent* {.importc: "struct netent", pure, final,
+              header: "<netdb.h>".} = object ## struct netent
+    n_name*: cstring         ## Official, fully-qualified (including the
+                             ## domain) name of the host.
+    n_aliases*: cstringArray ## A pointer to an array of pointers to
+                             ## alternative network names, terminated by a
+                             ## null pointer.
+    n_addrtype*: cint        ## The address type of the network.
+    n_net*: uint32            ## The network number, in host byte order.
+
+  Protoent* {.importc: "struct protoent", pure, final,
+              header: "<netdb.h>".} = object ## struct protoent
+    p_name*: cstring         ## Official name of the protocol.
+    p_aliases*: cstringArray ## A pointer to an array of pointers to
+                             ## alternative protocol names, terminated by
+                             ## a null pointer.
+    p_proto*: cint           ## The protocol number.
+
+  Servent* {.importc: "struct servent", pure, final,
+             header: "<netdb.h>".} = object ## struct servent
+    s_name*: cstring         ## Official name of the service.
+    s_aliases*: cstringArray ## A pointer to an array of pointers to
+                             ## alternative service names, terminated by
+                             ## a null pointer.
+    s_port*: cint            ## The port number at which the service
+                             ## resides, in network byte order.
+    s_proto*: cstring        ## The name of the protocol to use when
+                             ## contacting the service.
+
+  AddrInfo* {.importc: "struct addrinfo", pure, final,
+              header: "<netdb.h>".} = object ## struct addrinfo
+    ai_flags*: cint         ## Input flags.
+    ai_family*: cint        ## Address family of socket.
+    ai_socktype*: cint      ## Socket type.
+    ai_protocol*: cint      ## Protocol of socket.
+    ai_addrlen*: Socklen   ## Length of socket address.
+    ai_canonname*: cstring  ## Canonical name of service location.
+    ai_addr*: ptr SockAddr ## Socket address of socket.
+    ai_next*: ptr AddrInfo ## Pointer to next in list.
+
+  TPollfd* {.importc: "struct pollfd", pure, final,
+             header: "<poll.h>".} = object ## struct pollfd
+    fd*: cint        ## The following descriptor being polled.
+    events*: cshort  ## The input event flags (see below).
+    revents*: cshort ## The output event flags (see below).
+
+  Tnfds* {.importc: "nfds_t", header: "<poll.h>".} = culong
+
+var
+  errno* {.importc, header: "<errno.h>".}: cint ## error variable
+  h_errno* {.importc, header: "<netdb.h>".}: cint
+  daylight* {.importc: "_daylight", header: "<time.h>".}: cint
+  timezone* {.importc: "_timezone", header: "<time.h>".}: clong
+
+# Regenerate using detect.nim!
+include posix_nintendoswitch_consts
+
+const POSIX_SPAWN_USEVFORK* = cint(0x40)  # needs _GNU_SOURCE!
+
+# <sys/wait.h>
+proc WEXITSTATUS*(s: cint): cint =  (s shr 8) and 0xff
+proc WIFEXITED*(s:cint) : bool = (s and 0xff) == 0
+proc WTERMSIG*(s:cint): cint = s and 0x7f
+proc WSTOPSIG*(s:cint): cint = WEXITSTATUS(s)
+proc WIFSIGNALED*(s:cint) : bool = ((s and 0x7f) > 0) and ((s and 0x7f) < 0x7f)
+proc WIFSTOPPED*(s:cint) : bool = (s and 0xff) == 0x7f