Make fixes and improvements

- Invent iso8601us() for faster timestamps
- Improve --strace descriptions of sigset_t
- Rebuild the Landlock Make bootstrap binary
- Introduce MODE=sysv for non-Windows builds
- Permit OFD fcntl() locks under pledge(flock)
- redbean can now protect your kernel from ddos
- Have vfork() fallback to sys_fork() not fork()
- Change kmalloc() to not die when out of memory
- Improve documentation for some termios functions
- Rewrite putenv() and friends to conform to POSIX
- Fix linenoise + strace verbosity issue on Windows
- Fix regressions in our ability to show backtraces
- Change redbean SetHeader() to no-op if value is nil
- Improve fcntl() so SQLite locks work in non-WAL mode
- Remove some unnecessary work during fork() on Windows
- Create redbean-based SSL reverse proxy for IPv4 TurfWar
- Fix ape/apeinstall.sh warning when using non-bash shells
- Add ProgramTrustedIp(), and IsTrustedIp() APIs to redbean
- Support $PWD, $UID, $GID, and $EUID in command interpreter
- Introduce experimental JTqFpD APE prefix for non-Windows builds
- Invent blackhole daemon for firewalling IP addresses via UNIX named socket
- Add ProgramTokenBucket(), AcquireToken(), and CountTokens() APIs to redbean

libc/thread/pthread_attr_setscope.c

@@ -16,9 +16,34 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/dce.h"
+#include "libc/errno.h"
 #include "libc/thread/thread.h"
 
-int pthread_attr_setscope(pthread_attr_t *a, int x) {
-  a->__scope = x;
-  return 0;
+/**
+ * Sets contention scope attribute.
+ *
+ * @param contentionscope may be one of:
+ *     - `PTHREAD_SCOPE_SYSTEM` to fight the system for resources
+ *     - `PTHREAD_SCOPE_PROCESS` to fight familiar threads for resources
+ * @return 0 on success, or errno on error
+ * @raise ENOTSUP if `contentionscope` isn't supported on host OS
+ * @raise EINVAL if `contentionscope` was invalid
+ */
+int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope) {
+  switch (contentionscope) {
+    case PTHREAD_SCOPE_SYSTEM:
+      attr->__contentionscope = contentionscope;
+      return 0;
+    case PTHREAD_SCOPE_PROCESS:
+      // Linux almost certainly doesn't support thread scoping
+      // FreeBSD has THR_SYSTEM_SCOPE but it's not implemented
+      // OpenBSD pthreads claims support but really ignores it
+      // NetBSD pthreads claims support, but really ignores it
+      // XNU sources appear to make no mention of thread scope
+      // WIN32 documentation says nothing about thread scoping
+      return ENOTSUP;
+    default:
+      return EINVAL;
+  }
 }