Make improvements

- Every unit test now passes on Apple Silicon. The final piece of this puzzle was porting our POSIX threads cancelation support, since that works differently on ARM64 XNU vs. AMD64. Our semaphore support on Apple Silicon is also superior now compared to AMD64, thanks to the grand central dispatch library which lets *NSYNC locks go faster. - The Cosmopolitan runtime is now more stable, particularly on Windows. To do this, thread local storage is mandatory at all runtime levels, and the innermost packages of the C library is no longer being built using ASAN. TLS is being bootstrapped with a 128-byte TIB during the process startup phase, and then later on the runtime re-allocates it either statically or dynamically to support code using _Thread_local. fork() and execve() now do a better job cooperating with threads. We can now check how much stack memory is left in the process or thread when functions like kprintf() / execve() etc. call alloca(), so that ENOMEM can be raised, reduce a buffer size, or just print a warning. - POSIX signal emulation is now implemented the same way kernels do it with pthread_kill() and raise(). Any thread can interrupt any other thread, regardless of what it's doing. If it's blocked on read/write then the killer thread will cancel its i/o operation so that EINTR can be returned in the mark thread immediately. If it's doing a tight CPU bound operation, then that's also interrupted by the signal delivery. Signal delivery works now by suspending a thread and pushing context data structures onto its stack, and redirecting its execution to a trampoline function, which calls SetThreadContext(GetCurrentThread()) when it's done. - We're now doing a better job managing locks and handles. On NetBSD we now close semaphore file descriptors in forked children. Semaphores on Windows can now be canceled immediately, which means mutexes/condition variables will now go faster. Apple Silicon semaphores can be canceled too. We're now using Apple's pthread_yield() funciton. Apple _nocancel syscalls are now used on XNU when appropriate to ensure pthread_cancel requests aren't lost. The MbedTLS library has been updated to support POSIX thread cancelations. See tool/build/runitd.c for an example of how it can be used for production multi-threaded tls servers. Handles on Windows now leak less often across processes. All i/o operations on Windows are now overlapped, which means file pointers can no longer be inherited across dup() and fork() for the time being. - We now spawn a thread on Windows to deliver SIGCHLD and wakeup wait4() which means, for example, that posix_spawn() now goes 3x faster. POSIX spawn is also now more correct. Like Musl, it's now able to report the failure code of execve() via a pipe although our approach favors using shared memory to do that on systems that have a true vfork() function. - We now spawn a thread to deliver SIGALRM to threads when setitimer() is used. This enables the most precise wakeups the OS makes possible. - The Cosmopolitan runtime now uses less memory. On NetBSD for example, it turned out the kernel would actually commit the PT_GNU_STACK size which caused RSS to be 6mb for every process. Now it's down to ~4kb. On Apple Silicon, we reduce the mandatory upstream thread size to the smallest possible size to reduce the memory overhead of Cosmo threads. The examples directory has a program called greenbean which can spawn a web server on Linux with 10,000 worker threads and have the memory usage of the process be ~77mb. The 1024 byte overhead of POSIX-style thread-local storage is now optional; it won't be allocated until the pthread_setspecific/getspecific functions are called. On Windows, the threads that get spawned which are internal to the libc implementation use reserve rather than commit memory, which shaves a few hundred kb. - sigaltstack() is now supported on Windows, however it's currently not able to be used to handle stack overflows, since crash signals are still generated by WIN32. However the crash handler will still switch to the alt stack, which is helpful in environments with tiny threads. - Test binaries are now smaller. Many of the mandatory dependencies of the test runner have been removed. This ensures many programs can do a better job only linking the the thing they're testing. This caused the test binaries for LIBC_FMT for example, to decrease from 200kb to 50kb - long double is no longer used in the implementation details of libc, except in the APIs that define it. The old code that used long double for time (instead of struct timespec) has now been thoroughly removed. - ShowCrashReports() is now much tinier in MODE=tiny. Instead of doing backtraces itself, it'll just print a command you can run on the shell using our new `cosmoaddr2line` program to view the backtrace. - Crash report signal handling now works in a much better way. Instead of terminating the process, it now relies on SA_RESETHAND so that the default SIG_IGN behavior can terminate the process if necessary. - Our pledge() functionality has now been fully ported to AARCH64 Linux.
2025-07-25 12:00:31 +00:00 · 2023-09-18 20:44:45 -07:00 · 2023-09-18 20:44:45 -07:00 · ec480f5aa0
commit ec480f5aa0
parent c4eb838516
638 changed files with 7925 additions and 8282 deletions
--- a/libc/sysv/calls/__sys_accept.S
+++ b/libc/sysv/calls/__sys_accept.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_accept,0x81e81ea1d281e82b,2250,30,globl,hidden
+.scall __sys_accept,0x81e81ea1d281e82b,2250,2078,globl,hidden
--- a/libc/sysv/calls/__sys_connect.S
+++ b/libc/sysv/calls/__sys_connect.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_connect,0x862862862286282a,2251,98,globl,hidden
+.scall __sys_connect,0x862862862286282a,2251,2146,globl,hidden
--- a/libc/sysv/calls/__sys_fcntl_cp.S
+++ b/libc/sysv/calls/__sys_fcntl_cp.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_fcntl_cp,0x85c85c85c285c848,2073,92,globl,hidden
+.scall __sys_fcntl_cp,0x85c85c85c285c848,2073,2140,globl,hidden
--- a/libc/sysv/calls/__sys_openat.S
+++ b/libc/sysv/calls/__sys_openat.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_openat,0x9d49419f329cf901,2104,463,globl,hidden
+.scall __sys_openat,0x9d49419f329cf901,2104,2511,globl,hidden
--- a/libc/sysv/calls/__sys_poll.S
+++ b/libc/sysv/calls/__sys_poll.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_poll,0x8d18fc8d128e6807,4095,230,globl,hidden
+.scall __sys_poll,0x8d18fc8d128e6807,4095,2278,globl,hidden
--- a/libc/sysv/calls/__sys_wait4.S
+++ b/libc/sysv/calls/__sys_wait4.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall __sys_wait4,0x9c180b807280783d,2308,7,globl,hidden
+.scall __sys_wait4,0x9c180b807280783d,2308,2055,globl,hidden
--- a/libc/sysv/calls/sys_fdatasync.S
+++ b/libc/sysv/calls/sys_fdatasync.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_fdatasync,0x8f185fa2628bb84b,2131,187,globl,hidden
+.scall sys_fdatasync,0x8f185fa2628bb84b,2131,2235,globl,hidden
--- a/libc/sysv/calls/sys_flock.S
+++ b/libc/sysv/calls/sys_flock.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_flock,0x8838838832883849,2080,131,globl,hidden
+.scall sys_flock,0x8838838832883849,2080,2179,globl,hidden
--- a/libc/sysv/calls/sys_fstatfs.S
+++ b/libc/sysv/calls/sys_fstatfs.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_fstatfs,0x89e840a2c295a88a,2092,346,globl,hidden
+.scall sys_fstatfs,0x89e840a2c295a88a,2092,2394,globl,hidden
--- a/libc/sysv/calls/sys_fsync.S
+++ b/libc/sysv/calls/sys_fsync.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_fsync,0x85f85f85f285f84a,2130,95,globl,hidden
+.scall sys_fsync,0x85f85f85f285f84a,2130,2143,globl,hidden
--- a/libc/sysv/calls/sys_ftruncate.S
+++ b/libc/sysv/calls/sys_ftruncate.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_ftruncate,0x8c98a89e028c984d,2094,201,globl,hidden
+.scall sys_ftruncate,0x8c98a89e028c984d,2094,2249,globl,hidden
--- a/libc/sysv/calls/sys_ioctl_cp.S
+++ b/libc/sysv/calls/sys_ioctl_cp.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_ioctl_cp,0x8368368362836810,2077,54,globl,hidden
+.scall sys_ioctl_cp,0x8368368362836810,2077,2102,globl,hidden
--- a/libc/sysv/calls/sys_msgrcv.S
+++ b/libc/sysv/calls/sys_msgrcv.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_msgrcv,0x8e38e38e32905846,2236,261,globl
+.scall sys_msgrcv,0x8e38e38e32905846,2236,2309,globl
--- a/libc/sysv/calls/sys_msgsnd.S
+++ b/libc/sysv/calls/sys_msgsnd.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_msgsnd,0x8e28e28e22904845,2237,260,globl
+.scall sys_msgsnd,0x8e28e28e22904845,2237,2308,globl
--- a/libc/sysv/calls/sys_msync.S
+++ b/libc/sysv/calls/sys_msync.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_msync,0x915900841284181a,2275,65,globl,hidden
+.scall sys_msync,0x915900841284181a,2275,2113,globl,hidden
--- a/libc/sysv/calls/sys_pread.S
+++ b/libc/sysv/calls/sys_pread.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_pread,0x8ad8a99db2899811,2115,153,globl,hidden
+.scall sys_pread,0x8ad8a99db2899811,2115,2201,globl,hidden
--- a/libc/sysv/calls/sys_preadv.S
+++ b/libc/sysv/calls/sys_preadv.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_preadv,0x9218ab9212a1c927,2117,540,globl,hidden
+.scall sys_preadv,0x9218ab9212a1c927,2117,2588,globl,hidden
--- a/libc/sysv/calls/sys_pselect.S
+++ b/libc/sysv/calls/sys_pselect.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_pselect,0x9b486ea0a298a90e,2120,394,globl,hidden
+.scall sys_pselect,0x9b486ea0a298a90e,2120,2442,globl,hidden
--- a/libc/sysv/calls/sys_pwrite.S
+++ b/libc/sysv/calls/sys_pwrite.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_pwrite,0x8ae8aa9dc289a812,2116,154,globl,hidden
+.scall sys_pwrite,0x8ae8aa9dc289a812,2116,2202,globl,hidden
--- a/libc/sysv/calls/sys_pwritev.S
+++ b/libc/sysv/calls/sys_pwritev.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_pwritev,0x9228ac9222a1d928,2118,541,globl,hidden
+.scall sys_pwritev,0x9228ac9222a1d928,2118,2589,globl,hidden
--- a/libc/sysv/calls/sys_read.S
+++ b/libc/sysv/calls/sys_read.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_read,0x8038038032803800,2111,3,globl,hidden
+.scall sys_read,0x8038038032803800,2111,2051,globl,hidden
--- a/libc/sysv/calls/sys_readv.S
+++ b/libc/sysv/calls/sys_readv.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_readv,0x8788788782878813,2113,120,globl,hidden
+.scall sys_readv,0x8788788782878813,2113,2168,globl,hidden
--- a/libc/sysv/calls/sys_recvfrom.S
+++ b/libc/sysv/calls/sys_recvfrom.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_recvfrom,0x81d81d81d281d82d,2255,29,globl,hidden
+.scall sys_recvfrom,0x81d81d81d281d82d,2255,2077,globl,hidden
--- a/libc/sysv/calls/sys_recvmsg.S
+++ b/libc/sysv/calls/sys_recvmsg.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_recvmsg,0x81b81b81b281b82f,2260,27,globl,hidden
+.scall sys_recvmsg,0x81b81b81b281b82f,2260,2075,globl,hidden
--- a/libc/sysv/calls/sys_select.S
+++ b/libc/sysv/calls/sys_select.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_select,0x9a184785d285d817,4095,93,globl,hidden
+.scall sys_select,0x9a184785d285d817,4095,2141,globl,hidden
--- a/libc/sysv/calls/sys_sem_wait.S
+++ b/libc/sysv/calls/sys_sem_wait.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_sem_wait,0x8fcfff992290ffff,4095,271,globl
+.scall sys_sem_wait,0x8fcfff992290ffff,4095,2319,globl
--- a/libc/sysv/calls/sys_sendmsg.S
+++ b/libc/sysv/calls/sys_sendmsg.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_sendmsg,0x81c81c81c281c82e,2259,28,globl,hidden
+.scall sys_sendmsg,0x81c81c81c281c82e,2259,2076,globl,hidden
--- a/libc/sysv/calls/sys_sendto.S
+++ b/libc/sysv/calls/sys_sendto.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_sendto,0x885885885288582c,2254,133,globl,hidden
+.scall sys_sendto,0x885885885288582c,2254,2181,globl,hidden
--- a/libc/sysv/calls/sys_sigsuspend.S
+++ b/libc/sysv/calls/sys_sigsuspend.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_sigsuspend,0x92686f955286f882,2181,111,globl,hidden
+.scall sys_sigsuspend,0x92686f955286f882,2181,2159,globl,hidden
--- a/libc/sysv/calls/sys_statfs.S
+++ b/libc/sysv/calls/sys_statfs.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_statfs,0x89d83fa2b2959889,2091,345,globl,hidden
+.scall sys_statfs,0x89d83fa2b2959889,2091,2393,globl,hidden
--- a/libc/sysv/calls/sys_truncate.S
+++ b/libc/sysv/calls/sys_truncate.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_truncate,0x8c88a79df28c884c,2093,200,globl,hidden
+.scall sys_truncate,0x8c88a79df28c884c,2093,2248,globl,hidden
--- a/libc/sysv/calls/sys_waitid.S
+++ b/libc/sysv/calls/sys_waitid.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_waitid,0xfffffffff28ad8f7,95,173,globl
+.scall sys_waitid,0xfffffffff28ad8f7,95,2221,globl
--- a/libc/sysv/calls/sys_write.S
+++ b/libc/sysv/calls/sys_write.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_write,0x8048048042804801,2112,4,globl,hidden
+.scall sys_write,0x8048048042804801,2112,2052,globl,hidden
--- a/libc/sysv/calls/sys_writev.S
+++ b/libc/sysv/calls/sys_writev.S
@ -1,2 +1,2 @@
 #include "libc/sysv/macros.internal.h"
-.scall sys_writev,0x8798798792879814,2114,121,globl,hidden
+.scall sys_writev,0x8798798792879814,2114,2169,globl,hidden
--- a/libc/sysv/consts.sh
+++ b/libc/sysv/consts.sh
@ -18,6 +18,7 @@
 ╚────────────────────────────────────────────────────────────────'>/dev/null #*/
 dir=libc/sysv/consts
 . libc/sysv/gen.sh
+#include "libc/sysv/consts/ss.h"

 #	The Fifth Bell System, Community Edition
 #	» catalogue of carnage
@ -1057,6 +1058,8 @@ syscon	limits	_ARG_MAX				128*1024		128*1024		1024*1024		1024*1024		512*1024		51
 syscon	limits	_NAME_MAX				255			255			255			255			255			255			511			255			# probably higher on windows?
 syscon	limits	_PATH_MAX				4096			4096			1024			1024			1024			1024			1024			260			#
 syscon	limits	_NSIG					64			64			32			32			128			32			64			64			# _SIG_MAXSIG on FreeBSD
+syscon	limits	_MINSIGSTKSZ				2048			2048			32768			32768			4096			12288			8192			2048			#
+syscon	limits	_SIGSTKSZ				8192			2048			131072			131072			36864			28672			40960			8192			#

 #	unmount() flags
 #	a.k.a. umount2() on linux
@ -1549,8 +1552,8 @@ syscon	vid	KDFONTOP				0x4b72			0x4b72			0			0			0			0			0			0
 syscon	nr	__NR_exit				0x003c			0x005d			0x2000169		0x0169			0x01af			0x012e			0x136			0xfff			# __bsdthread_terminate() on XNU, thr_exit() on FreeBSD, __threxit() on OpenBSD, __lwp_exit() on NetBSD
 syscon	nr	__NR_exit_group				0x00e7			0x005e			0x2000001		0x0001			0x0001			0x0001			0x001			0xfff
 syscon	nr	__NR_read				0x0000			0x003f			0x2000003		0x0003			0x0003			0x0003			0x003			0xfff
-syscon	nr	__NR_write				0x0001			0x0040			0x2000004		0x0004			0x0004			0x0004			0x004			0xfff
-syscon	nr	__NR_open				0x0002			0x00b4			0x2000005		0x0005			0x0005			0x0005			0x005			0xfff
+syscon	nr	__NR_write				0x0001			0x0040			0x200018d		0x0004			0x0004			0x0004			0x004			0xfff			# write_nocancel() on XNU
+syscon	nr	__NR_open				0x0002			0x00b4			0x200018e		0x0005			0x0005			0x0005			0x005			0xfff			# open_nocancel() on XNU
 syscon	nr	__NR_close				0x0003			0x0039			0x2000006		0x0006			0x0006			0x0006			0x006			0xfff
 syscon	nr	__NR_stat				0x0004			0x004f			0x2000152		0x0152			0xfff			0x0026			0x1b7			0xfff
 syscon	nr	__NR_fstat				0x0005			0x0050			0x2000153		0x0153			0x0227			0x0035			0x1b8			0xfff
@ -1574,7 +1577,7 @@ syscon	nr	__NR_pipe				0x0016			0x0fff			0x200002a		0x002a			0x021e			0x0107			0
 syscon	nr	__NR_select				0x0017			0x0fff			0x200005d		0x005d			0x005d			0x0047			0x1a1			0xfff
 syscon	nr	__NR_pselect				0xfff			0x0fff			0x200018a		0x018a			0x020a			0x006e			0x1b4			0xfff
 syscon	nr	__NR_pselect6				0x010e			0x0048			0xfff			0xfff			0xfff			0xfff			0xfff			0xfff
-syscon	nr	__NR_sched_yield			0x0018			0x007c			0x200005d		0x005d			0x014b			0x012a			0x15e			0xfff			# select() on XNU (previously swtch() but removed in 12.4)
+syscon	nr	__NR_sched_yield			0x0018			0x007c			0x2000197		0x005d			0x014b			0x012a			0x15e			0xfff			# select_nocancel() on XNU (previously swtch() but removed in 12.4)
 syscon	nr	__NR_mremap				0x0019			0x00d8			0xfff			0xfff			0xfff			0xfff			0x19b			0xfff
 syscon	nr	__NR_mincore				0x001b			0x00e8			0x200004e		0x004e			0x004e			0x004e			0x04e			0xfff
 syscon	nr	__NR_madvise				0x001c			0x00e9			0x200004b		0x004b			0x004b			0x004b			0x04b			0xfff
@ -1792,7 +1795,7 @@ syscon	nr	__NR_ioprio_get				0x00fc			0x001f			0xfff			0xfff			0xfff			0xfff			0
 syscon	nr	__NR_inotify_init			0x00fd			0x0fff			0xfff			0xfff			0xfff			0xfff			0xfff			0xfff
 syscon	nr	__NR_inotify_add_watch			0x00fe			0x0fff			0xfff			0xfff			0xfff			0xfff			0xfff			0xfff
 syscon	nr	__NR_inotify_rm_watch			0x00ff			0x0fff			0xfff			0xfff			0xfff			0xfff			0xfff			0xfff
-syscon	nr	__NR_openat				0x0101			0x0038			0x20001cf		0x01cf			0x01f3			0x0141			0x1d4			0xfff
+syscon	nr	__NR_openat				0x0101			0x0038			0x20001d0		0x01cf			0x01f3			0x0141			0x1d4			0xfff			# openat_nocancel() on XNU
 syscon	nr	__NR_mkdirat				0x0102			0x0022			0x20001db		0x01db			0x01f0			0x013e			0x1cd			0xfff
 syscon	nr	__NR_fchownat				0x0104			0x0036			0x20001d4		0x01d4			0x01eb			0x013b			0x1d0			0xfff
 syscon	nr	__NR_utime				0x0084			0x0062			0xfff			0xfff			0xfff			0xfff			0xfff			0xfff
--- a/libc/sysv/consts/ENOEXEC.S
+++ b/libc/sysv/consts/ENOEXEC.S
@ -1,2 +1,5 @@
 #include "libc/sysv/consts/syscon.internal.h"
 .syscon errno,ENOEXEC,8,8,8,8,8,8,8,193
+#ifdef __x86_64__
+.yoink kDos2Errno.ENOEXEC
+#endif
--- a/libc/sysv/consts/_MINSIGSTKSZ.S
+++ b/libc/sysv/consts/_MINSIGSTKSZ.S
@ -0,0 +1,2 @@
+#include "libc/sysv/consts/syscon.internal.h"
+.syscon limits,_MINSIGSTKSZ,2048,2048,32768,32768,4096,12288,8192,2048
--- a/libc/sysv/consts/_SIGSTKSZ.S
+++ b/libc/sysv/consts/_SIGSTKSZ.S
@ -0,0 +1,2 @@
+#include "libc/sysv/consts/syscon.internal.h"
+.syscon limits,_SIGSTKSZ,8192,2048,131072,131072,36864,28672,40960,8192
--- a/libc/sysv/consts/__NR_open.S
+++ b/libc/sysv/consts/__NR_open.S
@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon nr,__NR_open,0x0002,0x00b4,0x2000005,0x0005,0x0005,0x0005,0x005,0xfff
+.syscon nr,__NR_open,0x0002,0x00b4,0x200018e,0x0005,0x0005,0x0005,0x005,0xfff
--- a/libc/sysv/consts/__NR_openat.S
+++ b/libc/sysv/consts/__NR_openat.S
@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon nr,__NR_openat,0x0101,0x0038,0x20001cf,0x01cf,0x01f3,0x0141,0x1d4,0xfff
+.syscon nr,__NR_openat,0x0101,0x0038,0x20001d0,0x01cf,0x01f3,0x0141,0x1d4,0xfff
--- a/libc/sysv/consts/__NR_sched_yield.S
+++ b/libc/sysv/consts/__NR_sched_yield.S
@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon nr,__NR_sched_yield,0x0018,0x007c,0x200005d,0x005d,0x014b,0x012a,0x15e,0xfff
+.syscon nr,__NR_sched_yield,0x0018,0x007c,0x2000197,0x005d,0x014b,0x012a,0x15e,0xfff
--- a/libc/sysv/consts/__NR_write.S
+++ b/libc/sysv/consts/__NR_write.S
@ -1,2 +1,2 @@
 #include "libc/sysv/consts/syscon.internal.h"
-.syscon nr,__NR_write,0x0001,0x0040,0x2000004,0x0004,0x0004,0x0004,0x004,0xfff
+.syscon nr,__NR_write,0x0001,0x0040,0x200018d,0x0004,0x0004,0x0004,0x004,0xfff
--- a/libc/sysv/consts/ss.h
+++ b/libc/sysv/consts/ss.h
@ -4,6 +4,8 @@
 COSMOPOLITAN_C_START_

 extern const int SS_DISABLE;
+extern const int _SIGSTKSZ;
+extern const int _MINSIGSTKSZ;

 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
@ -13,5 +15,4 @@ COSMOPOLITAN_C_END_
 #define SS_ONSTACK  1
 #define SS_DISABLE  SS_DISABLE

-
 #endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_SS_H_ */
--- a/libc/sysv/gen.sh
+++ b/libc/sysv/gen.sh
@ -33,7 +33,7 @@ scall() {
    arm_linux=$(($3 + 0))
    arm_xnu=$((($amd & 0xfff000) >> 12))
    if [ $arm_xnu != 4095 ]; then
-      arm_xnu=$(($arm_xnu & 0x7ff))
+      arm_xnu=$(($arm_xnu & 0xfff))
    fi
    shift 3
    set -- "$name" "$amd" "$arm_linux" "$arm_xnu" "$*"
--- a/libc/sysv/systemfive.S
+++ b/libc/sysv/systemfive.S
@ -149,8 +149,8 @@ systemfive_cancellable_end:		// i/o calls park here for long time
 	jmp	4f			// now we are in fact cancelled
 systemfive_cancel:			// SIGTHR will jump here too
 	pop	%rbp
-4:	jmp	_pthread_cancel_sys	// tail call
-	.weak	_pthread_cancel_sys	// must be linked if we're cancelled
+4:	jmp	_pthread_cancel_ack	// tail call
+	.weak	_pthread_cancel_ack	// must be linked if we're cancelled
 #if IsModeDbg()
 not_a_cancellation_point:		// need BEGIN/END_CANCELLATION_POINT
 	nop
--- a/libc/sysv/sysv.c
+++ b/libc/sysv/sysv.c
@ -39,7 +39,7 @@ register long cosmo_tls_register asm("x28");
 void report_cancellation_point(void);

 dontinline long systemfive_cancel(void) {
-  return _pthread_cancel_sys();
+  return _weaken(_pthread_cancel_ack)();
 }

 // special region of executable memory where cancellation is safe
@ -49,16 +49,16 @@ dontinline long systemfive_cancellable(void) {
  // plus (2) cancellations aren't disabled
  struct PosixThread *pth = 0;
  struct CosmoTib *tib = __get_tls();
-  if (cosmo_tls_register &&               //
-      _weaken(_pthread_cancel_sys) &&     //
-      !(tib->tib_flags & PT_NOCANCEL) &&  //
+  if (cosmo_tls_register &&            //
+      _weaken(_pthread_cancel_ack) &&  //
      (pth = (struct PosixThread *)tib->tib_pthread)) {
    // check if cancellation is already pending
-    if (atomic_load_explicit(&pth->cancelled, memory_order_acquire)) {
+    if (!(pth->pt_flags & PT_NOCANCEL) &&
+        atomic_load_explicit(&pth->cancelled, memory_order_acquire)) {
      return systemfive_cancel();
    }
 #if IsModeDbg()
-    if (!(tib->tib_flags & PT_INCANCEL)) {
+    if (!(pth->flags & PT_INCANCEL)) {
      if (_weaken(report_cancellation_point)) {
        _weaken(report_cancellation_point)();
      }
@ -87,7 +87,7 @@ dontinline long systemfive_cancellable(void) {
  }

  // check if i/o call was interrupted by sigthr
-  if (pth && x0 == -EINTR &&
+  if (pth && x0 == -EINTR && !(pth->pt_flags & PT_NOCANCEL) &&
      atomic_load_explicit(&pth->cancelled, memory_order_acquire)) {
    return systemfive_cancel();
  }
--- a/libc/sysv/sysv.mk
+++ b/libc/sysv/sysv.mk
@ -80,7 +80,9 @@ o/$(MODE)/libc/sysv/sysret.o				\
 o/$(MODE)/libc/sysv/errfun2.o				\
 o/$(MODE)/libc/sysv/sysret.o: private			\
 		CFLAGS +=				\
-			$(NO_MAGIC)
+			-ffreestanding			\
+			-fno-stack-protector		\
+			-fno-sanitize=all

 ifeq ($(ARCH),aarch64)
 o/$(MODE)/libc/sysv/sysv.o: private			\