/* Test of fsync() function. Copyright (C) 2008-2018 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include #include #include "signature.h" SIGNATURE_CHECK (fsync, int, (int)); #include #include #include "macros.h" int main (void) { int fd; const char *file = "test-fsync.txt"; /* Assuming stdin and stdout are ttys, fsync is allowed to fail, but may succeed as an extension. */ for (fd = 0; fd < 2; fd++) if (fsync (fd) != 0) { ASSERT (errno == EINVAL /* POSIX */ || errno == ENOTSUP /* seen on Mac OS X 10.5 */ || errno == EBADF /* seen on AIX 7.1 */ || errno == EIO /* seen on mingw */ ); } /* fsync must fail on invalid fd. */ { errno = 0; ASSERT (fsync (-1) == -1); ASSERT (errno == EBADF); } { close (99); errno = 0; ASSERT (fsync (99) == -1); ASSERT (errno == EBADF); } fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644); ASSERT (0 <= fd); ASSERT (write (fd, "hello", 5) == 5); ASSERT (fsync (fd) == 0); ASSERT (close (fd) == 0); /* For a read-only regular file input file descriptor, fsync should succeed (since at least atime changes can be synchronized). */ fd = open (file, O_RDONLY); ASSERT (0 <= fd); { char buf[1]; ASSERT (read (fd, buf, sizeof buf) == sizeof buf); } ASSERT (fsync (fd) == 0); ASSERT (close (fd) == 0); ASSERT (unlink (file) == 0); return 0; }