Work around copy_file_range() bug in eCryptFs

When programs like ar.ape and compile.ape are run on eCryptFs partitions
on Linux, copy_file_range() will fail with EINVAL which is wrong because
eCryptFs which doesn't support this system call, should raise EOPNOTSUPP

See https://github.com/jart/cosmopolitan/discussions/1305

libc/calls/copy_file_range.c

@@ -83,9 +83,11 @@ static void copy_file_range_init(void) {
  * @return number of bytes transferred, or -1 w/ errno
  * @raise EXDEV if source and destination are on different filesystems
  * @raise EBADF if `infd` or `outfd` aren't open files or append-only
+ * @raise EOPNOTSUPP if filesystem doesn't support this operation
  * @raise EPERM if `fdout` refers to an immutable file on Linux
  * @raise ECANCELED if thread was cancelled in masked mode
  * @raise EINVAL if ranges overlap or `flags` is non-zero
+ * @raise EINVAL on eCryptFs filesystems that have a bug
  * @raise EFBIG if `setrlimit(RLIMIT_FSIZE)` is exceeded
  * @raise EFAULT if one of the pointers memory is bad
  * @raise ERANGE if overflow happens computing ranges

libc/calls/sig.c

@@ -424,7 +424,6 @@ textwindows void __sig_generate(int sig, int sic) {
       (1ull << (sig - 1))) {
     return;
   }
-  BLOCK_SIGNALS;
   _pthread_lock();
   for (e = dll_first(_pthread_list); e; e = dll_next(_pthread_list, e)) {
     pt = POSIXTHREAD_CONTAINER(e);
@@ -462,7 +461,6 @@ textwindows void __sig_generate(int sig, int sic) {
     atomic_fetch_or_explicit(__sig.process, 1ull << (sig - 1),
                              memory_order_relaxed);
   }
-  ALLOW_SIGNALS;
 }
 
 static textwindows char *__sig_stpcpy(char *d, const char *s) {

libc/thread/pthread_tryjoin_np.c

@@ -32,6 +32,7 @@
  *     if the thread called pthread_exit(), or `PTHREAD_CANCELED` if
  *     pthread_cancel() destroyed the thread instead
  * @return 0 on success, or errno on error
+ * @raise EBUSY if thread has not yet terminated
  * @raise ECANCELED if calling thread was cancelled in masked mode
  * @cancelationpoint
  * @returnserrno

tool/build/ar.c

@@ -298,6 +298,7 @@ static void CopyFileOrDie(const char *inpath, int infd,    //
       if (got != -1) {
         exchanged = got;
       } else if (errno == EXDEV ||       // different partitions
+                 errno == EINVAL ||      // possible w/ ecryptfs
                  errno == ENOSYS ||      // not linux or freebsd
                  errno == ENOTSUP ||     // probably a /zip file
                  errno == EOPNOTSUPP) {  // technically the same

tool/build/compile.c

@@ -798,7 +798,11 @@ bool MovePreservingDestinationInode(const char *from, const char *to) {
     rc = copy_file_range(fdin, 0, fdout, 0, remain, 0);
     if (rc != -1) {
       remain -= rc;
-    } else if (errno == EXDEV || errno == ENOSYS) {
+    } else if (errno == EXDEV ||    // different partitions
+               errno == EINVAL ||   // possible w/ ecryptfs
+               errno == ENOSYS ||   // not linux or freebsd
+               errno == ENOTSUP ||  // no fs support for it
+               errno == EOPNOTSUPP) {
       if (lseek(fdin, 0, SEEK_SET) == -1) {
         res = false;
         break;