Introduce CPUID detection for Blink

libc/calls/pledge.c

@@ -239,7 +239,7 @@
 int pledge(const char *promises, const char *execpromises) {
   int e, rc;
   unsigned long ipromises, iexecpromises;
-  if (IsGenuineCosmo()) {
+  if (IsGenuineCosmo() || IsGenuineBlink()) {
     rc = 0;  // blink doesn't support seccomp
   } else if (!ParsePromises(promises, &ipromises) &&
              !ParsePromises(execpromises, &iexecpromises)) {

libc/calls/unveil.c

@@ -354,7 +354,7 @@ int sys_unveil_linux(const char *path, const char *permissions) {
 int unveil(const char *path, const char *permissions) {
   int e, rc;
   e = errno;
-  if (IsGenuineCosmo()) {
+  if (IsGenuineCosmo() || IsGenuineBlink()) {
     rc = 0;  // blink doesn't support landlock
   } else if (IsLinux()) {
     rc = sys_unveil_linux(path, permissions);

libc/intrin/isdebuggerpresent.c

@@ -43,6 +43,7 @@ int IsDebuggerPresent(bool force) {
   int e, fd, res;
   char *p, buf[1024];
   if (!force && IsGenuineCosmo()) return 0;
+  if (!force && IsGenuineBlink()) return 0;
   if (!force && __getenv(environ, "HEISENDEBUG")) return 0;
   if (IsWindows()) return IsBeingDebugged();
   if (__isworker) return false;

libc/log/attachdebugger.c

@@ -57,7 +57,8 @@ relegated int(AttachDebugger)(intptr_t continuetoaddr) {
   char pidstr[11], breakcmd[40];
   const char *se, *elf, *gdb, *rewind, *layout;
   __restore_tty();
-  if (IsGenuineCosmo() || !(gdb = GetGdbPath()) || !isatty(0) || !isatty(1) ||
+  if (IsGenuineCosmo() || IsGenuineBlink() || !(gdb = GetGdbPath()) ||
+      !isatty(0) || !isatty(1) ||
       (ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC)) == -1) {
     return -1;
   }

libc/nexgen32e/vendor.internal.h

@@ -18,5 +18,10 @@
    kCpuids[KCPUIDS_0H][KCPUIDS_EDX] == 0x43656e69 /* ineC */ && \
    kCpuids[KCPUIDS_0H][KCPUIDS_ECX] == 0x6f6d736f /* osmo */)
 
+#define IsGenuineBlink()                                        \
+  (kCpuids[KCPUIDS_0H][KCPUIDS_EBX] == 0x756e6547 /* Genu */ && \
+   kCpuids[KCPUIDS_0H][KCPUIDS_EDX] == 0x42656e69 /* ineB */ && \
+   kCpuids[KCPUIDS_0H][KCPUIDS_ECX] == 0x6b6e696c /* link */)
+
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_NEXGEN32E_VENDOR_H_ */

libc/thread/sem_getvalue.c

@@ -22,7 +22,7 @@
 #include "libc/thread/semaphore.h"
 
 /**
- * Destroys unnamed semaphore.
+ * Returns semaphore value.
  *
  * @param sem was created by sem_init()
  * @param sval receives output value