diff options
Diffstat (limited to 'gnulib/tests/test-pread.c')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/tests/test-pread.c | 101 |
2 files changed, 101 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/tests/test-pread.c b/gnulib/tests/test-pread.c new file mode 100644 index 0000000..5515f59 --- /dev/null +++ b/gnulib/tests/test-pread.c @@ -0,0 +1,101 @@ +/* Test the pread function. + Copyright (C) 2009-2011 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/>. */ + +/* Written by Jim Meyering. */ + +#include <config.h> + +#include <unistd.h> + +#include "signature.h" +SIGNATURE_CHECK (pread, ssize_t, (int, void *, size_t, off_t)); + +#include <sys/types.h> +#include <fcntl.h> +#include <errno.h> + +#include "macros.h" + +#define N (sizeof buf - 1) + +int +main (void) +{ + char const *file = "in"; + int fd; + char buf[] = "0123456789"; + off_t pos; + + ASSERT (file); + + fd = open (file, O_CREAT | O_WRONLY, 0600); + ASSERT (0 <= fd); + ASSERT (write (fd, buf, N) == N); + ASSERT (close (fd) == 0); + + fd = open (file, O_RDONLY); + ASSERT (0 <= fd); + + for (pos = 0; pos < 3; pos++) + { + size_t i; + off_t init_pos = lseek (fd, pos, SEEK_SET); + ASSERT (init_pos == pos); + + for (i = 0; i < N; i++) + { + char byte_buf; + ASSERT (pread (fd, &byte_buf, 1, i) == 1); + ASSERT (byte_buf == buf[i]); + ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos); + } + } + + { + /* Invalid offset must evoke failure with EINVAL. */ + char byte; + ASSERT (pread (fd, &byte, 1, (off_t) -1) == -1); + ASSERT (errno == EINVAL + || errno == EFBIG /* seen on OpenBSD 4.9 */ + ); + } + + ASSERT (close (fd) == 0); + + { + char byte; + /* Trying to operate on a pipe must evoke failure with ESPIPE. + This assumes that stdin is a pipe, and hence not seekable. */ + ASSERT (pread (STDIN_FILENO, &byte, 1, 1) == -1); + ASSERT (errno == ESPIPE); + } + + /* Test behaviour for invalid file descriptors. */ + { + char byte; + errno = 0; + ASSERT (pread (-1, &byte, 1, 0) == -1); + ASSERT (errno == EBADF); + } + { + char byte; + errno = 0; + ASSERT (pread (99, &byte, 1, 0) == -1); + ASSERT (errno == EBADF); + } + + return 0; +} |