Implement support for POSIX thread cancellations

This change makes some miracle modifications to the System Five system
call support, which lets us have safe, correct, and atomic handling of
thread cancellations. It all turned out to be cheaper than anticipated
because it wasn't necessary to modify the system call veneers. We were
able to encode the cancellability of each system call into the magnums
found in libc/sysv/syscalls.sh. Since cancellations are so waq, we are
also supporting a lovely Musl Libc mask feature for raising ECANCELED.

libc/sysv/calls/__sys_accept.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall __sys_accept,0x01e01e21d201e02b,globl,hidden
+.scall __sys_accept,0x81e81ea1d281e82b,globl,hidden

libc/sysv/calls/__sys_accept4.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall __sys_accept4,0xfff05d21dffff120,globl,hidden
+.scall __sys_accept4,0xfff85da1dffff920,globl,hidden

libc/sysv/calls/__sys_connect.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall __sys_connect,0x062062062206202a,globl,hidden
+.scall __sys_connect,0x862862862286282a,globl,hidden

libc/sysv/calls/__sys_fcntl_cp.s

@@ -0,0 +1,2 @@
+.include "o/libc/sysv/macros.internal.inc"
+.scall __sys_fcntl_cp,0x85c85c85c285c848,globl,hidden

libc/sysv/calls/__sys_openat.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall __sys_openat,0x1d41411f321cf101,globl,hidden
+.scall __sys_openat,0x9d49419f329cf901,globl,hidden

libc/sysv/calls/__sys_wait4.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall __sys_wait4,0x1c100b007200703d,globl,hidden
+.scall __sys_wait4,0x9c180b807280783d,globl,hidden

libc/sysv/calls/posix_fallocate.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall posix_fallocate,0x1dffff212fffffff,globl,hidden
+.scall posix_fallocate,0x9dffffa12fffffff,globl,hidden

libc/sysv/calls/sys_clock_nanosleep.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_clock_nanosleep,0x1ddfff0f4ffff0e6,globl,hidden
+.scall sys_clock_nanosleep,0x9ddfff8f4ffff8e6,globl,hidden

libc/sysv/calls/sys_epoll_wait.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_epoll_wait,0xfffffffffffff0e8,globl,hidden
+.scall sys_epoll_wait,0xfffffffffffff8e8,globl,hidden

libc/sysv/calls/sys_fallocate.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_fallocate,0xfffffffffffff11d,globl
+.scall sys_fallocate,0xfffffffffffff91d,globl

libc/sysv/calls/sys_fdatasync.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_fdatasync,0x0f105f22620bb04b,globl,hidden
+.scall sys_fdatasync,0x8f185fa2628bb84b,globl,hidden

libc/sysv/calls/sys_flock.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_flock,0x0830830832083049,globl,hidden
+.scall sys_flock,0x8838838832883849,globl,hidden

libc/sysv/calls/sys_fstatfs.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_fstatfs,0x09e04022c215a08a,globl,hidden
+.scall sys_fstatfs,0x89e840a2c295a88a,globl,hidden

libc/sysv/calls/sys_fsync.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_fsync,0x05f05f05f205f04a,globl,hidden
+.scall sys_fsync,0x85f85f85f285f84a,globl,hidden

libc/sysv/calls/sys_ftruncate.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_ftruncate,0x0c90c91e020c904d,globl,hidden
+.scall sys_ftruncate,0x8c98c99e028c984d,globl,hidden

libc/sysv/calls/sys_getrandom.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_getrandom,0xfff00723321f413e,globl,hidden
+.scall sys_getrandom,0xfff807a3329f493e,globl,hidden

libc/sysv/calls/sys_ioctl_cp.s

@@ -0,0 +1,2 @@
+.include "o/libc/sysv/macros.internal.inc"
+.scall sys_ioctl_cp,0x8368368362836810,globl,hidden

libc/sysv/calls/sys_msgrcv.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_msgrcv,0x0e30e30e32105046,globl
+.scall sys_msgrcv,0x8e38e38e32905846,globl

libc/sysv/calls/sys_msgsnd.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_msgsnd,0x0e20e20e22104045,globl
+.scall sys_msgsnd,0x8e28e28e22904845,globl

libc/sysv/calls/sys_msync.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_msync,0x115100041204101a,globl,hidden
+.scall sys_msync,0x915900841284181a,globl,hidden

libc/sysv/calls/sys_nanosleep.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_nanosleep,0x1ae05b0f0ffff023,globl,hidden
+.scall sys_nanosleep,0x9ae85b8f0ffff823,globl,hidden

libc/sysv/calls/sys_open.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_open,0x0050050052005002,globl,hidden
+.scall sys_open,0x8058058052805802,globl,hidden

libc/sysv/calls/sys_poll.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_poll,0x0d10fc0d120e6007,globl,hidden
+.scall sys_poll,0x8d18fc8d128e6807,globl,hidden

libc/sysv/calls/sys_ppoll.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_ppoll,0xfff06d221ffff10f,globl,hidden
+.scall sys_ppoll,0xfff86da21ffff90f,globl,hidden

libc/sysv/calls/sys_pread.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_pread,0x0ad0ad1db2099011,globl,hidden
+.scall sys_pread,0x8ad8ad9db2899811,globl,hidden

libc/sysv/calls/sys_preadv.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_preadv,0x12110b121221c127,globl,hidden
+.scall sys_preadv,0x92190b9212a1c927,globl,hidden

libc/sysv/calls/sys_pselect.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_pselect,0x1b406e20a218a10e,globl,hidden
+.scall sys_pselect,0x9b486ea0a298a90e,globl,hidden

libc/sysv/calls/sys_pwrite.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_pwrite,0x0ae0ae1dc209a012,globl,hidden
+.scall sys_pwrite,0x8ae8ae9dc289a812,globl,hidden

libc/sysv/calls/sys_pwritev.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_pwritev,0x12210c122221d128,globl,hidden
+.scall sys_pwritev,0x92290c9222a1d928,globl,hidden

libc/sysv/calls/sys_read.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_read,0x0030030032003000,globl,hidden
+.scall sys_read,0x8038038032803800,globl,hidden

libc/sysv/calls/sys_readv.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_readv,0x0780780782078013,globl,hidden
+.scall sys_readv,0x8788788782878813,globl,hidden

libc/sysv/calls/sys_recvfrom.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_recvfrom,0x01d01d01d201d02d,globl,hidden
+.scall sys_recvfrom,0x81d81d81d281d82d,globl,hidden

libc/sysv/calls/sys_recvmsg.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_recvmsg,0x01b01b01b201b02f,globl,hidden
+.scall sys_recvmsg,0x81b81b81b281b82f,globl,hidden

libc/sysv/calls/sys_select.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_select,0x1a104705d205d017,globl,hidden
+.scall sys_select,0x9a184785d285d817,globl,hidden

libc/sysv/calls/sys_sendmsg.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_sendmsg,0x01c01c01c201c02e,globl,hidden
+.scall sys_sendmsg,0x81c81c81c281c82e,globl,hidden

libc/sysv/calls/sys_sendto.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_sendto,0x085085085208502c,globl,hidden
+.scall sys_sendto,0x885885885288582c,globl,hidden

libc/sysv/calls/sys_sigsuspend.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_sigsuspend,0x12606f155206f082,globl,hidden
+.scall sys_sigsuspend,0x92686f955286f882,globl,hidden

libc/sysv/calls/sys_sigtimedwait.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_sigtimedwait,0x1affff159ffff080,globl,hidden
+.scall sys_sigtimedwait,0x9affff959ffff880,globl,hidden

libc/sysv/calls/sys_statfs.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_statfs,0x09d03f22b2159089,globl,hidden
+.scall sys_statfs,0x89d83fa2b2959889,globl,hidden

libc/sysv/calls/sys_truncate.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_truncate,0x0c80c81df20c804c,globl,hidden
+.scall sys_truncate,0x8c88c89df28c884c,globl,hidden

libc/sysv/calls/sys_waitid.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_waitid,0xfffffffff20ad0f7,globl
+.scall sys_waitid,0xfffffffff28ad8f7,globl

libc/sysv/calls/sys_write.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_write,0x0040040042004001,globl,hidden
+.scall sys_write,0x8048048042804801,globl,hidden

libc/sysv/calls/sys_writev.s

@@ -1,2 +1,2 @@
 .include "o/libc/sysv/macros.internal.inc"
-.scall sys_writev,0x0790790792079014,globl,hidden
+.scall sys_writev,0x8798798792879814,globl,hidden