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Diffstat (limited to 'tests/basic/fops-sanity.c')
| -rw-r--r-- | tests/basic/fops-sanity.c | 951 |
1 files changed, 951 insertions, 0 deletions
diff --git a/tests/basic/fops-sanity.c b/tests/basic/fops-sanity.c new file mode 100644 index 00000000000..5012db6362d --- /dev/null +++ b/tests/basic/fops-sanity.c @@ -0,0 +1,951 @@ +/* Copyright (c) 2014 Red Hat, Inc. All rights reserved. + +* This copyrighted material is made available to anyone wishing +* to use, modify, copy, or redistribute it subject to the terms +* and conditions of the GNU General Public License version 2. + +* 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, write to the Free +* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +* Boston, MA 02110-1301, USA. +*/ + +/* Filesystem basic sanity check, tests all (almost) fops. */ + +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <attr/xattr.h> +#include <errno.h> +#include <string.h> +#include <dirent.h> + +/* for fd based fops after unlink */ +int fd_based_fops_1 (char *filename); +/* for fd based fops before unlink */ +int fd_based_fops_2 (char *filename); +/* fops based on fd after dup */ +int dup_fd_based_fops (char *filename); +/* for fops based on path */ +int path_based_fops (char *filename); +/* for fops which operate on directory */ +int dir_based_fops (char *filename); +/* for fops which operate in link files (symlinks) */ +int link_based_fops (char *filename); +/* to test open syscall with open modes available. */ +int test_open_modes (char *filename); +/* generic function which does open write and read. */ +int generic_open_read_write (char *filename, int flag); + +int +main (int argc, char *argv[]) +{ + int ret = -1; + int result = 0; + char filename[255] = {0,}; + + if (argc > 1) + strcpy(filename, argv[1]); + else + strcpy(filename, "temp-xattr-test-file"); + + ret = fd_based_fops_1 (strcat(filename, "_1")); + if (ret < 0) { + fprintf (stderr, "fd based file operation 1 failed\n"); + result |= ret; + } else { + fprintf (stdout, "fd based file operation 1 passed\n"); + } + + ret = fd_based_fops_2 (strcat(filename, "_2")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "fd based file operation 2 failed\n"); + } else { + fprintf (stdout, "fd based file operation 2 passed\n"); + } + + ret = dup_fd_based_fops (strcat (filename, "_3")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "dup fd based file operation failed\n"); + } else { + fprintf (stdout, "dup fd based file operation passed\n"); + } + + ret = path_based_fops (strcat (filename, "_4")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "path based file operation failed\n"); + } else { + fprintf (stdout, "path based file operation passed\n"); + } + + ret = dir_based_fops (strcat (filename, "_5")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "directory based file operation failed\n"); + } else { + fprintf (stdout, "directory based file operation passed\n"); + } + + ret = link_based_fops (strcat (filename, "_5")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "link based file operation failed\n"); + } else { + fprintf (stdout, "link based file operation passed\n"); + } + + ret = test_open_modes (strcat (filename, "_5")); + if (ret < 0) { + result |= ret; + fprintf (stderr, "testing modes of `open' call failed\n"); + } else { + fprintf (stdout, "testing modes of `open' call passed\n"); + } + return result; +} + +/* Execute all possible fops on a fd which is unlinked */ +int +fd_based_fops_1 (char *filename) +{ + int fd = 0; + int ret = -1; + int result = 0; + struct stat stbuf = {0,}; + char wstr[50] = {0,}; + char rstr[50] = {0,}; + + fd = open (filename, O_RDWR|O_CREAT); + if (fd < 0) { + fprintf (stderr, "open failed : %s\n", strerror (errno)); + return ret; + } + + ret = unlink (filename); + if (ret < 0) { + fprintf (stderr, "unlink failed : %s\n", strerror (errno)); + result |= ret; + } + + strcpy (wstr, "This is my string\n"); + ret = write (fd, wstr, strlen(wstr)); + if (ret <= 0) { + fprintf (stderr, "write failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lseek (fd, 0, SEEK_SET); + if (ret < 0) { + fprintf (stderr, "lseek failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = read (fd, rstr, strlen(wstr)); + if (ret <= 0) { + fprintf (stderr, "read failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = memcmp (rstr, wstr, strlen (wstr)); + if (ret != 0) { + fprintf (stderr, "read returning junk\n"); + result |= ret; + } + + ret = ftruncate (fd, 0); + if (ret < 0) { + fprintf (stderr, "ftruncate failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fstat (fd, &stbuf); + if (ret < 0) { + fprintf (stderr, "fstat failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fsync (fd); + if (ret < 0) { + fprintf (stderr, "fsync failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fdatasync (fd); + if (ret < 0) { + fprintf (stderr, "fdatasync failed : %s\n", strerror (errno)); + result |= ret; + } + +/* + * These metadata operations fail at the moment because kernel doesn't + * pass the client fd in the operation. + * The following bug tracks this change. + * https://bugzilla.redhat.com/show_bug.cgi?id=1084422 + * ret = fchmod (fd, 0640); + * if (ret < 0) { + * fprintf (stderr, "fchmod failed : %s\n", strerror (errno)); + * result |= ret; + * } + + * ret = fchown (fd, 10001, 10001); + * if (ret < 0) { + * fprintf (stderr, "fchown failed : %s\n", strerror (errno)); + * result |= ret; + * } + + * ret = fsetxattr (fd, "trusted.xattr-test", "working", 8, 0); + * if (ret < 0) { + * fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno)); + * result |= ret; + * } + + * ret = flistxattr (fd, NULL, 0); + * if (ret <= 0) { + * fprintf (stderr, "flistxattr failed : %s\n", strerror (errno)); + * result |= ret; + * } + + * ret = fgetxattr (fd, "trusted.xattr-test", NULL, 0); + * if (ret <= 0) { + * fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno)); + * result |= ret; + * } + + * ret = fremovexattr (fd, "trusted.xattr-test"); + * if (ret < 0) { + * fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno)); + * result |= ret; + * } + */ + + if (fd) + close(fd); + return result; +} + + +int +fd_based_fops_2 (char *filename) +{ + int fd = 0; + int ret = -1; + int result = 0; + struct stat stbuf = {0,}; + char wstr[50] = {0,}; + char rstr[50] = {0,}; + + fd = open (filename, O_RDWR|O_CREAT); + if (fd < 0) { + fprintf (stderr, "open failed : %s\n", strerror (errno)); + return ret; + } + + ret = ftruncate (fd, 0); + if (ret < 0) { + fprintf (stderr, "ftruncate failed : %s\n", strerror (errno)); + result |= ret; + } + + strcpy (wstr, "This is my second string\n"); + ret = write (fd, wstr, strlen (wstr)); + if (ret < 0) { + fprintf (stderr, "write failed: %s\n", strerror (errno)); + result |= ret; + } + + lseek (fd, 0, SEEK_SET); + if (ret < 0) { + fprintf (stderr, "lseek failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = read (fd, rstr, strlen (wstr)); + if (ret <= 0) { + fprintf (stderr, "read failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = memcmp (rstr, wstr, strlen (wstr)); + if (ret != 0) { + fprintf (stderr, "read returning junk\n"); + result |= ret; + } + + ret = fstat (fd, &stbuf); + if (ret < 0) { + fprintf (stderr, "fstat failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fchmod (fd, 0640); + if (ret < 0) { + fprintf (stderr, "fchmod failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fchown (fd, 10001, 10001); + if (ret < 0) { + fprintf (stderr, "fchown failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fsync (fd); + if (ret < 0) { + fprintf (stderr, "fsync failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fsetxattr (fd, "trusted.xattr-test", "working", 8, 0); + if (ret < 0) { + fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fdatasync (fd); + if (ret < 0) { + fprintf (stderr, "fdatasync failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = flistxattr (fd, NULL, 0); + if (ret <= 0) { + fprintf (stderr, "flistxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fgetxattr (fd, "trusted.xattr-test", NULL, 0); + if (ret <= 0) { + fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fremovexattr (fd, "trusted.xattr-test"); + if (ret < 0) { + fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno)); + result |= ret; + } + + if (fd) + close (fd); + unlink (filename); + + return result; +} + +int +path_based_fops (char *filename) +{ + int ret = -1; + int fd = 0; + int result = 0; + struct stat stbuf = {0,}; + char newfilename[255] = {0,}; + char *hardlink = "linkfile-hard.txt"; + char *symlnk = "linkfile-soft.txt"; + char buf[1024] = {0,}; + + fd = creat (filename, 0644); + if (fd < 0) { + fprintf (stderr, "creat failed: %s\n", strerror (errno)); + return ret; + } + + ret = truncate (filename, 0); + if (ret < 0) { + fprintf (stderr, "truncate failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = stat (filename, &stbuf); + if (ret < 0) { + fprintf (stderr, "stat failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = chmod (filename, 0640); + if (ret < 0) { + fprintf (stderr, "chmod failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = chown (filename, 10001, 10001); + if (ret < 0) { + fprintf (stderr, "chown failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = setxattr (filename, "trusted.xattr-test", "working", 8, 0); + if (ret < 0) { + fprintf (stderr, "setxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = listxattr (filename, NULL, 0); + if (ret <= 0) { + ret = -1; + fprintf (stderr, "listxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = getxattr (filename, "trusted.xattr-test", NULL, 0); + if (ret <= 0) { + fprintf (stderr, "getxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = removexattr (filename, "trusted.xattr-test"); + if (ret < 0) { + fprintf (stderr, "removexattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = access (filename, R_OK|W_OK); + if (ret < 0) { + fprintf (stderr, "access failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = link (filename, hardlink); + if (ret < 0) { + fprintf (stderr, "link failed: %s\n", strerror(errno)); + result |= ret; + } + unlink(hardlink); + + ret = symlink (filename, symlnk); + if (ret < 0) { + fprintf (stderr, "symlink failed: %s\n", strerror(errno)); + result |= ret; + } + + ret = readlink (symlnk, buf, sizeof(buf)); + if (ret < 0) { + fprintf (stderr, "readlink failed: %s\n", strerror(errno)); + result |= ret; + } + unlink(symlnk); + + /* Create a character special file */ + ret = mknod ("cspecial", S_IFCHR|S_IRWXU|S_IRWXG, makedev(2,3)); + if (ret < 0) { + fprintf (stderr, "cpsecial mknod failed: %s\n", + strerror(errno)); + result |= ret; + } + unlink("cspecial"); + + ret = mknod ("bspecial", S_IFBLK|S_IRWXU|S_IRWXG, makedev(4,5)); + if (ret < 0) { + fprintf (stderr, "bspecial mknod failed: %s\n", + strerror(errno)); + result |= ret; + } + unlink("bspecial"); + + ret = mknod ("fifo", S_IFIFO|S_IRWXU|S_IRWXG, 0); + if (ret < 0) { + fprintf (stderr, "fifo mknod failed: %s\n", + strerror(errno)); + result |= ret; + } + unlink("fifo"); + + ret = mknod ("sock", S_IFSOCK|S_IRWXU|S_IRWXG, 0); + if (ret < 0) { + fprintf (stderr, "sock mknod failed: %s\n", + strerror(errno)); + result |= ret; + } + unlink("sock"); + + strcpy (newfilename, filename); + strcat(newfilename, "_new"); + ret = rename (filename, newfilename); + if (ret < 0) { + fprintf (stderr, "rename failed: %s\n", strerror (errno)); + result |= ret; + } + unlink (newfilename); + + if (fd) + close (fd); + + unlink (filename); + return result; +} + +int +dup_fd_based_fops (char *filename) +{ + int fd = 0; + int result = 0; + int newfd = 0; + int ret = -1; + struct stat stbuf = {0,}; + char wstr[50] = {0,}; + char rstr[50] = {0,}; + + fd = open (filename, O_RDWR|O_CREAT); + if (fd < 0) { + fprintf (stderr, "open failed : %s\n", strerror (errno)); + return ret; + } + + newfd = dup (fd); + if (newfd < 0) { + fprintf (stderr, "dup failed: %s\n", strerror (errno)); + result |= ret; + } + + close (fd); + + strcpy (wstr, "This is my string\n"); + ret = write (newfd, wstr, strlen(wstr)); + if (ret <= 0) { + fprintf (stderr, "write failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lseek (newfd, 0, SEEK_SET); + if (ret < 0) { + fprintf (stderr, "lseek failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = read (newfd, rstr, strlen(wstr)); + if (ret <= 0) { + fprintf (stderr, "read failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = memcmp (rstr, wstr, strlen (wstr)); + if (ret != 0) { + fprintf (stderr, "read returning junk\n"); + result |= ret; + } + + ret = ftruncate (newfd, 0); + if (ret < 0) { + fprintf (stderr, "ftruncate failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fstat (newfd, &stbuf); + if (ret < 0) { + fprintf (stderr, "fstat failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fchmod (newfd, 0640); + if (ret < 0) { + fprintf (stderr, "fchmod failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fchown (newfd, 10001, 10001); + if (ret < 0) { + fprintf (stderr, "fchown failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fsync (newfd); + if (ret < 0) { + fprintf (stderr, "fsync failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fsetxattr (newfd, "trusted.xattr-test", "working", 8, 0); + if (ret < 0) { + fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fdatasync (newfd); + if (ret < 0) { + fprintf (stderr, "fdatasync failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = flistxattr (newfd, NULL, 0); + if (ret <= 0) { + fprintf (stderr, "flistxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fgetxattr (newfd, "trusted.xattr-test", NULL, 0); + if (ret <= 0) { + fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno)); + result |= ret; + } + + ret = fremovexattr (newfd, "trusted.xattr-test"); + if (ret < 0) { + fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno)); + result |= ret; + } + + if (newfd) + close (newfd); + ret = unlink (filename); + if (ret < 0) { + fprintf (stderr, "unlink failed : %s\n", strerror (errno)); + result |= ret; + } + return result; +} + +int +dir_based_fops (char *dirname) +{ + int ret = -1; + int result = 0; + DIR *dp = NULL; + char buff[255] = {0,}; + struct dirent *dbuff = {0,}; + struct stat stbuff = {0,}; + char newdname[255] = {0,}; + char *cwd = NULL; + + ret = mkdir (dirname, 0755); + if (ret < 0) { + fprintf (stderr, "mkdir failed: %s\n", strerror (errno)); + return ret; + } + + dp = opendir (dirname); + if (dp == NULL) { + fprintf (stderr, "opendir failed: %s\n", strerror (errno)); + result |= ret; + } + + dbuff = readdir (dp); + if (NULL == dbuff) { + fprintf (stderr, "readdir failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = closedir (dp); + if (ret < 0) { + fprintf (stderr, "closedir failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = stat (dirname, &stbuff); + if (ret < 0) { + fprintf (stderr, "stat failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = chmod (dirname, 0744); + if (ret < 0) { + fprintf (stderr, "chmod failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = chown (dirname, 10001, 10001); + if (ret < 0) { + fprintf (stderr, "chmod failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = setxattr (dirname, "trusted.xattr-test", "working", 8, 0); + if (ret < 0) { + fprintf (stderr, "setxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = listxattr (dirname, NULL, 0); + if (ret <= 0) { + ret = -1; + fprintf (stderr, "listxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = getxattr (dirname, "trusted.xattr-test", NULL, 0); + if (ret <= 0) { + ret = -1; + fprintf (stderr, "getxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = removexattr (dirname, "trusted.xattr-test"); + if (ret < 0) { + fprintf (stderr, "removexattr failed: %s\n", strerror (errno)); + result |= ret; + } + + strcpy (newdname, dirname); + strcat (newdname, "/../"); + ret = chdir (newdname); + if (ret < 0) { + fprintf (stderr, "chdir failed: %s\n", strerror (errno)); + result |= ret; + } + + cwd = getcwd (buff, 255); + if (NULL == cwd) { + fprintf (stderr, "getcwd failed: %s\n", strerror (errno)); + result |= ret; + } + + strcpy (newdname, dirname); + strcat (newdname, "new"); + ret = rename (dirname, newdname); + if (ret < 0) { + fprintf (stderr, "rename failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = rmdir (newdname); + if (ret < 0) { + fprintf (stderr, "rmdir failed: %s\n", strerror (errno)); + result |= ret; + } + + rmdir (dirname); + return result; +} + +int +link_based_fops (char *filename) +{ + int ret = -1; + int result = 0; + int fd = 0; + char newname[255] = {0,}; + char linkname[255] = {0,}; + struct stat lstbuf = {0,}; + + fd = creat (filename, 0644); + if (fd < 0) { + fd = 0; + fprintf (stderr, "creat failed: %s\n", strerror (errno)); + return ret; + } + + strcpy (newname, filename); + strcat (newname, "_hlink"); + ret = link (filename, newname); + if (ret < 0) { + fprintf (stderr, "link failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = unlink (filename); + if (ret < 0) { + fprintf (stderr, "unlink failed: %s\n", strerror (errno)); + result |= ret; + } + + strcpy (linkname, filename); + strcat (linkname, "_slink"); + ret = symlink (newname, linkname); + if (ret < 0) { + fprintf (stderr, "symlink failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lstat (linkname, &lstbuf); + if (ret < 0) { + fprintf (stderr, "lstbuf failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lchown (linkname, 10001, 10001); + if (ret < 0) { + fprintf (stderr, "lchown failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lsetxattr (linkname, "trusted.lxattr-test", "working", 8, 0); + if (ret < 0) { + fprintf (stderr, "lsetxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = llistxattr (linkname, NULL, 0); + if (ret < 0) { + ret = -1; + fprintf (stderr, "llistxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lgetxattr (linkname, "trusted.lxattr-test", NULL, 0); + if (ret < 0) { + ret = -1; + fprintf (stderr, "lgetxattr failed: %s\n", strerror (errno)); + result |= ret; + } + + ret = lremovexattr (linkname, "trusted.lxattr-test"); + if (ret < 0) { + fprintf (stderr, "lremovexattr failed: %s\n", strerror (errno)); + result |= ret; + } + + if (fd) + close(fd); + unlink (linkname); + unlink (newname); + return result; +} + +int +test_open_modes (char *filename) +{ + int ret = -1; + int result = 0; + + ret = generic_open_read_write (filename, O_CREAT|O_WRONLY); + if (ret != 0) { + fprintf (stderr, "flag O_CREAT|O_WRONLY failed: \n"); + result |= ret; + } + + ret = generic_open_read_write (filename, O_CREAT|O_RDWR); + if (ret != 0) { + fprintf (stderr, "flag O_CREAT|O_RDWR failed\n"); + result |= ret; + } + + ret = generic_open_read_write (filename, O_CREAT|O_RDONLY); + if (ret != 0) { + fprintf (stderr, "flag O_CREAT|O_RDONLY failed\n"); + result |= ret; + } + + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_WRONLY); + if (ret != 0) { + fprintf (stderr, "flag O_WRONLY failed\n"); + result |= ret; + } + + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_RDWR); + if (0 != ret) { + fprintf (stderr, "flag O_RDWR failed\n"); + result |= ret; + } + + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_RDONLY); + if (0 != ret) { + fprintf (stderr, "flag O_RDONLY failed\n"); + result |= ret; + } + + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_TRUNC|O_WRONLY); + if (0 != ret) { + fprintf (stderr, "flag O_TRUNC|O_WRONLY failed\n"); + result |= ret; + } + +#if 0 /* undefined behaviour, unable to reliably test */ + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_TRUNC|O_RDONLY); + if (0 != ret) { + fprintf (stderr, "flag O_TRUNC|O_RDONLY failed\n"); + result |= ret; + } +#endif + + ret = generic_open_read_write (filename, O_CREAT|O_RDWR|O_SYNC); + if (0 != ret) { + fprintf (stderr, "flag O_CREAT|O_RDWR|O_SYNC failed\n"); + result |= ret; + } + + ret = creat (filename, 0644); + close (ret); + ret = generic_open_read_write (filename, O_CREAT|O_EXCL); + if (0 != ret) { + fprintf (stderr, "flag O_CREAT|O_EXCL failed\n"); + result |= ret; + } + + return result; +} + +int +generic_open_read_write (char *filename, int flag) +{ + int fd = 0; + int ret = -1; + char wstring[50] = {0,}; + char rstring[50] = {0,}; + + fd = open (filename, flag); + if (fd < 0) { + if (flag == (O_CREAT|O_EXCL) && errno == EEXIST) { + unlink (filename); + return 0; + } + else { + fprintf (stderr, "open failed: %s\n", strerror (errno)); + return -1; + } + } + + strcpy (wstring, "My string to write\n"); + ret = write (fd, wstring, strlen(wstring)); + if (ret <= 0) { + if (errno != EBADF) { + fprintf (stderr, "write failed: %s\n", strerror (errno)); + close (fd); + unlink(filename); + return ret; + } + } + + ret = lseek (fd, 0, SEEK_SET); + if (ret < 0) { + close (fd); + unlink(filename); + return ret; + } + + ret = read (fd, rstring, strlen(wstring)); + if (ret < 0 && flag != (O_CREAT|O_WRONLY) && flag != O_WRONLY && \ + flag != (O_TRUNC|O_WRONLY)) { + close (fd); + unlink (filename); + return ret; + } + + /* Compare the rstring with wstring. But we do not want to return + * error when the flag is either O_RDONLY, O_CREAT|O_RDONLY or + * O_TRUNC|O_RDONLY. Because in that case we are not writing + * anything to the file.*/ + + ret = memcmp (wstring, rstring, strlen (wstring)); + if (0 != ret && flag != (O_TRUNC|O_WRONLY) && flag != O_WRONLY && \ + flag != (O_CREAT|O_WRONLY) && !(flag == \ + (O_CREAT|O_RDONLY) || flag == O_RDONLY \ + || flag == (O_TRUNC|O_RDONLY))) { + fprintf (stderr, "read is returning junk\n"); + close (fd); + unlink (filename); + return ret; + } + + close (fd); + unlink (filename); + return 0; +} |