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/temp.h

@@ -0,0 +1,22 @@
+#ifndef COSMOPOLITAN_LIBC_TEMP_H_
+#define COSMOPOLITAN_LIBC_TEMP_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+char *mktemp(char *) returnsnonnull paramsnonnull() __wur;
+char *mkdtemp(char *) paramsnonnull() __wur;
+int mkstemp(char *) paramsnonnull() __wur;
+int mkstemps(char *, int) paramsnonnull() __wur;
+
+#if defined(_GNU_SOURCE) || defined(_COSMO_SOURCE)
+int mkostemp(char *, unsigned) paramsnonnull() __wur;
+int mkostemps(char *, int, unsigned) paramsnonnull() __wur;
+#endif
+
+#ifdef _COSMO_SOURCE
+int openatemp(int, char *, int, int, int) paramsnonnull() __wur;
+#endif
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_TEMP_H_ */