Make improvements

- Invent openatemp() API
- Invent O_UNLINK open flag
- Introduce getenv_secure() API
- Remove `git pull` from cosmocc
- Fix utimes() when path is NULL
- Fix mktemp() to never return NULL
- Fix utimensat() UTIME_OMIT on XNU
- Improve utimensat() code for RHEL5
- Turn `argv[0]` C:/ to /C/ on Windows
- Introduce tmpnam() and tmpnam_r() APIs
- Fix more const issues with internal APIs
- Permit utimes() on WIN32 in O_RDONLY mode
- Fix fdopendir() to check fd is a directory
- Fix recent crash regression in landlock make
- Fix futimens(AT_FDCWD, NULL) to return EBADF
- Use workaround so `make -j` doesn't fork bomb
- Rename dontdiscard to __wur (just like glibc)
- Fix st_size for WIN32 symlinks containing UTF-8
- Introduce stdio ext APIs needed by GNU coreutils
- Fix lstat() on WIN32 for symlinks to directories
- Move some constants from normalize.inc to limits.h
- Fix segv with memchr() and memcmp() overlapping page
- Implement POSIX fflush() behavior for reader streams
- Implement AT_SYMLINK_NOFOLLOW for utimensat() on WIN32
- Don't change read-only status of existing files on WIN32
- Correctly handle `0x[^[:xdigit:]]` case in strtol() functions

libc/nt/winsock.h

@@ -291,7 +291,7 @@ struct NtInterfaceInfo {
  */
 
 int32_t WSAStartup(uint16_t wVersionRequested, struct NtWsaData *lpWSAData)
-    paramsnonnull() dontdiscard;
+    paramsnonnull() __wur;
 
 int WSACleanup(void);
 int WSAGetLastError(void) nosideeffect;
@@ -311,7 +311,7 @@ int __sys_select_nt(int, struct NtFdSet *, struct NtFdSet *, struct NtFdSet *,
 
 uint64_t WSASocket(int af, int type, int protocol,
                    const struct NtWsaProtocolInfo *opt_lpProtocolInfo,
-                   const uint32_t opt_group, uint32_t dwFlags) dontdiscard;
+                   const uint32_t opt_group, uint32_t dwFlags) __wur;
 
 int WSAConnect(uint64_t s, const struct sockaddr *name, const int namelen,
                const struct NtIovec *opt_lpCallerData,
@@ -340,8 +340,7 @@ bool32 WSAConnectByList(uint64_t s,
 int64_t WSAAccept(uint64_t s, struct sockaddr *out_addr,
                   int32_t *opt_inout_addrlen,
                   const NtConditionProc opt_lpfnCondition,
-                  const uint32_t *opt_dwCallbackData)
-    paramsnonnull((2)) dontdiscard;
+                  const uint32_t *opt_dwCallbackData) paramsnonnull((2)) __wur;
 
 bool32 AcceptEx(int64_t sListenSocket, int64_t sAcceptSocket,
                 void *out_lpOutputBuffer /*[recvlen+local+remoteaddrlen]*/,
@@ -409,7 +408,7 @@ int WSANSPIoctl(int64_t hLookup, uint32_t dwControlCode,
                 const struct NtWsaCompletion *opt_lpCompletion)
     paramsnonnull((3, 5, 7));
 
-int64_t WSACreateEvent(void) dontdiscard;
+int64_t WSACreateEvent(void) __wur;
 bool32 WSACloseEvent(const int64_t hEvent);
 bool32 WSAResetEvent(const int64_t hEvent);
 bool32 WSASetEvent(const int64_t hEvent);