Improve system calls

- Wrap clock_getres()
- Wrap sched_setscheduler()
- Make sleep() api conformant
- Polyfill sleep() using select()
- Improve clock_gettime() polyfill
- Make nanosleep() POSIX conformant
- Slightly improve some DNS functions
- Further strengthen pledge() sandboxing
- Improve rounding of timeval / timespec
- Allow layering of pledge() calls on Linux
- Polyfill sched_yield() using select() on XNU
- Delete more system constants we probably don't need

tool/emacs/cosmo-asm-mode.el

@@ -113,6 +113,7 @@
        "asyncsignalsafe"
        "notasyncsignalsafe"
        "isa"
+       "norestart"
        "mayalias"
        "sideffect")
       "\\>"]))

tool/net/help.txt

@@ -1095,7 +1095,7 @@ FUNCTIONS
           operating system to choose a port, which may be revealed later on
           by GetServerAddr or the -z flag to stdout.
 
-  ProgramMaxPayloadSize(int64)
+  ProgramMaxPayloadSize(int)
           Sets the maximum HTTP message payload size in bytes. The
           default is very conservatively set to 65536 so this is
           something many people will want to increase. This limit is

tool/net/redbean.c

@@ -20,7 +20,6 @@
 #include "libc/bits/safemacros.internal.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/ioctl.h"
-#include "libc/calls/math.h"
 #include "libc/calls/struct/dirent.h"
 #include "libc/calls/struct/filter.h"
 #include "libc/calls/struct/flock.h"
@@ -410,7 +409,6 @@ static int statuscode;
 static int shutdownsig;
 static int sslpskindex;
 static int oldloglevel;
-static int maxpayloadsize;
 static int messageshandled;
 static int sslticketlifetime;
 static uint32_t clientaddrsize;
@@ -437,6 +435,7 @@ static const char *zpath;
 static const char *brand;
 static char *monitorstack;
 static char gzip_footer[8];
+static long maxpayloadsize;
 static const char *pidpath;
 static const char *logpath;
 static const char *histpath;
@@ -1205,7 +1204,7 @@ static void ReportWorkerResources(int pid, struct rusage *ru) {
 
 static void HandleWorkerExit(int pid, int ws, struct rusage *ru) {
   LockInc(&shared->c.connectionshandled);
-  AddRusage(&shared->children, ru);
+  _addrusage(&shared->children, ru);
   ReportWorkerExit(pid, ws);
   ReportWorkerResources(pid, ru);
   if (hasonprocessdestroy) {