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Diffstat (limited to 'gnulib-tests/test-write.c')
-rw-r--r-- | gnulib-tests/test-write.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/gnulib-tests/test-write.c b/gnulib-tests/test-write.c new file mode 100644 index 0000000..a9e6331 --- /dev/null +++ b/gnulib-tests/test-write.c @@ -0,0 +1,79 @@ +/* Test the write() function. + Copyright (C) 2011-2016 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 <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +#include <unistd.h> + +#include "signature.h" +SIGNATURE_CHECK (write, ssize_t, (int, const void *, size_t)); + +#include <errno.h> +#include <fcntl.h> +#include <string.h> + +#include "macros.h" + +int +main (void) +{ + const char *filename = "test-write.tmp"; + int fd; + + /* Create a file with a simple contents. */ + fd = open (filename, O_CREAT | O_WRONLY, 0600); + ASSERT (fd >= 0); + ASSERT (write (fd, "Hello World", 11) == 11); + ASSERT (close (fd) == 0); + + /* Write into the middle of the file. */ + fd = open (filename, O_WRONLY); + ASSERT (fd >= 0); + ASSERT (lseek (fd, 6, SEEK_SET) == 6); + ASSERT (write (fd, "fascination", 11) == 11); + + /* Verify the contents of the file. */ + { + char buf[64]; + int rfd = open (filename, O_RDONLY); + ASSERT (rfd >= 0); + ASSERT (read (rfd, buf, sizeof (buf)) == 17); + ASSERT (close (rfd) == 0); + ASSERT (memcmp (buf, "Hello fascination", 17) == 0); + } + + ASSERT (close (fd) == 0); + + /* Test behaviour for invalid file descriptors. */ + { + char byte = 'x'; + errno = 0; + ASSERT (write (-1, &byte, 1) == -1); + ASSERT (errno == EBADF); + } + { + char byte = 'x'; + close (99); + errno = 0; + ASSERT (write (99, &byte, 1) == -1); + ASSERT (errno == EBADF); + } + + /* Clean up. */ + unlink (filename); + + return 0; +} |