Make major improvements to redbean and libraries

The most exciting improvement is dynamic pages will soon be able to use
the executable itself as an object store. it required a heroic technique
for overcoming ETXTBSY restrictions which lets us open the executable in
read/write mode, which means (1) wa can restore the APE header, and (2)
we can potentially containerize redbean extension code so that modules
you download for your redbean online will only impact your redbean.

Here's a list of breaking changes to redbean:

- Remove /tool/net/ prefix from magic ZIP paths
- GetHeader() now returns NIL if header is absent

Here's a list of fixes and enhancements to redbean:

- Support 64-bit ZIP archives
- Record User-Agent header in logs
- Add twelve error handlers to accept()
- Display octal st_mode on listing page
- Show ZIP file comments on listing page
- Restore APE MZ header on redbean startup
- Track request count on redbean index page
- Report server uptime on redbean index page
- Don't bind server socket using SO_REUSEPORT
- Fix #151 where Lua LoadAsset() could free twice
- Report rusage accounting when workers exit w/ -vv
- Use ZIP iattr field as text/plain vs. binary hint
- Add ParseUrl() API for parsing things like a.href
- Add ParseParams() API for parsing HTTP POST bodies
- Add IsAcceptablePath() API for checking dots, etc.
- Add IsValidHttpToken() API for validating sane ASCII
- Add IsAcceptableHostPort() for validating HOST[:PORT]
- Send 400 response to HTTP/1.1 requests without a Host
- Send 403 response if ZIP or file isn't other readable
- Add virtual hosting that tries prepending Host to path
- Route requests based on Host in Request-URI if present
- Host routing will attempt to remove or add the www. prefix
- Sign-extend UNIX timestamps and don't adjust FileTime zone

Here's some of the improvements made to Cosmopolitan Libc:

- Fix ape.S indentation
- Improve consts.sh magnums
- Write pretty good URL parser
- Improve rusage accounting apis
- Bring mremap() closer to working
- Added ZIP APIs which will change
- Check for overflow in reallocarray()
- Remove overly fancy linkage in strerror()
- Fix GDB attach on crash w/ OpenBSD msyscall()
- Make sigqueue() portable to most UNIX distros
- Make integer serialization macros more elegant
- Bring back 34x tprecode8to16() performance boost
- Make malloc() more resilient to absurdly large sizes

libc/sysv/syscalls.sh

@@ -61,7 +61,7 @@ scall	sys_select		0x1a104705d205d017	globl hidden
 scall	pselect			0x1b406e20a218afff	globl
 scall	pselect6		0xfffffffffffff10e	globl
 scall	sys_sched_yield		0x15e12a14b103c018	globl hidden # swtch() on xnu
-scall	sys_mremap		0x19bffffffffff019	globl hidden
+scall	__sys_mremap		0x19bffffffffff019	globl hidden
 scall	mincore			0x04e04e04e204e01b	globl
 scall	sys_madvise		0x04b04b04b204b01c	globl hidden
 scall	shmget			0x0e71210e7210901d	globl # consider mmap
@@ -95,7 +95,7 @@ scall	sys_fork		0x0020020022002039	globl hidden # xnu needs eax&=~-edx bc eax al
 #scall	vfork			0x042042042204203a	globl        # this syscall is from the moon so we implement it by hand in libc/calls/hefty/vfork.S
 scall	sys_posix_spawn		0xfffffffff20f4fff	globl hidden # good luck figuring out how xnu defines this
 scall	__sys_execve		0x03b03b03b203b03b	globl hidden
-scall	sys_wait4		0x1c100b007200703d	globl hidden
+scall	__sys_wait4		0x1c100b007200703d	globl hidden
 scall	sys_kill		0x02507a025202503e	globl hidden # kill(pid, sig, 1) b/c xnu
 scall	sys_killpg		0xffffff092fffffff	globl hidden
 scall	clone			0xfffffffffffff038	globl
@@ -137,7 +137,7 @@ scall	sys_lchown		0x1130fe0fe216c05e	globl hidden # impl. w/ fchownat()
 scall	umask			0x03c03c03c203c05f	globl
 scall	sys_gettimeofday	0x1a20430742074060	globl hidden # xnu esi/edx=0
 scall	sys_getrlimit		0x0c20c20c220c2061	globl hidden
-scall	sys_getrusage		0x1bd0130752075062	globl hidden
+scall	__sys_getrusage		0x1bd0130752075062	globl hidden
 scall	sys_sysinfo		0xfffffffffffff063	globl hidden
 scall	sys_times		0xfffffffffffff064	globl hidden
 scall	sys_ptrace		0x01a01a01a201a065	globl hidden
@@ -190,7 +190,8 @@ scall	setfsgid		0xfffffffffffff07b	globl
 scall	capget			0xfffffffffffff07d	globl
 scall	capset			0xfffffffffffff07e	globl
 scall	sigtimedwait		0xffffff159ffff080	globl
-scall	rt_sigqueueinfo		0xfffffffffffff081	globl
+scall	sys_sigqueue		0xffffff1c8fffffff	globl
+scall	sys_sigqueueinfo	0x0f5ffffffffff081	globl # rt_sigqueueinfo on linux
 scall	personality		0xfffffffffffff087	globl
 scall	ustat			0xfffffffffffff088	globl
 scall	sysfs			0xfffffffffffff08b	globl
@@ -254,6 +255,11 @@ scall	timer_settime		0x1beffffffffff0df	globl
 scall	timer_gettime		0x1bfffffffffff0e0	globl
 scall	timer_getoverrun	0x0efffffffffff0e1	globl
 scall	timer_delete		0x0ecffffffffff0e2	globl
+scall	ktimer_create		0xffffff0ebfffffff	globl
+scall	ktimer_delete		0xffffff0ecfffffff	globl
+scall	ktimer_getoverrun	0xffffff0effffffff	globl
+scall	ktimer_gettime		0xffffff0eefffffff	globl
+scall	ktimer_settime		0xffffff0edfffffff	globl
 scall	clock_settime		0x1ac0580e9ffff0e3	globl
 scall	sys_clock_gettime	0x1ab0570e8ffff0e4	globl hidden # Linux 2.6+ (c. 2003); XNU uses magic address
 scall	clock_getres		0x1ad0590eaffff0e5	globl
@@ -690,11 +696,6 @@ scall	ksem_timedwait		0xffffff1b9fffffff	globl
 scall	ksem_trywait		0xffffff193fffffff	globl
 scall	ksem_unlink		0xffffff196fffffff	globl
 scall	ksem_wait		0xffffff192fffffff	globl
-scall	ktimer_create		0xffffff0ebfffffff	globl
-scall	ktimer_delete		0xffffff0ecfffffff	globl
-scall	ktimer_getoverrun	0xffffff0effffffff	globl
-scall	ktimer_gettime		0xffffff0eefffffff	globl
-scall	ktimer_settime		0xffffff0edfffffff	globl
 scall	lchflags		0x130fff187fffffff	globl
 scall	lchmod			0x112fff112fffffff	globl
 scall	lgetfh			0xffffff0a0fffffff	globl
@@ -734,7 +735,6 @@ scall	setfib			0xffffff0affffffff	globl
 scall	sethostid		0xffffff08ffffffff	globl
 scall	setloginclass		0xffffff20cfffffff	globl
 scall	sigblock		0xffffff06dfffffff	globl
-scall	sigqueue		0xffffff1c8fffffff	globl
 scall	sigsetmask		0xffffff06efffffff	globl
 scall	sigstack		0xffffff070fffffff	globl
 scall	sigvec			0xffffff06cfffffff	globl