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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
int
main(int argc, char *argv[])
{
const char *glfs_dir = NULL, *filepath = NULL;
DIR *dirfd = NULL;
int filefd = 0, ret = 0;
struct stat stbuf = {
0,
};
size_t size_before_write = 0;
glfs_dir = argv[1];
filepath = argv[2];
dirfd = opendir(glfs_dir);
if (dirfd == NULL) {
fprintf(stderr, "opening directory failed (%s)\n", strerror(errno));
goto err;
}
filefd = open(filepath, O_RDWR);
if (filefd < 0) {
fprintf(stderr, "open failed on path %s (%s)\n", filepath,
strerror(errno));
goto err;
}
ret = stat(filepath, &stbuf);
if (ret < 0) {
fprintf(stderr, "stat failed on path %s (%s)\n", filepath,
strerror(errno));
goto err;
}
size_before_write = stbuf.st_size;
ret = write(filefd, "testdata", strlen("testdata123") + 1);
if (ret <= 0) {
fprintf(stderr, "write failed (%s)\n", strerror(errno));
goto err;
}
while (readdir(dirfd)) {
/* do nothing */
}
ret = stat(filepath, &stbuf);
if (ret < 0) {
fprintf(stderr, "stat failed on path %s (%s)\n", strerror(errno));
goto err;
}
if (stbuf.st_size == size_before_write) {
fprintf(stderr,
"file size (%lu) has not changed even after "
"its written to\n",
stbuf.st_size);
goto err;
}
return 0;
err:
return -1;
}
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