+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ */
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
+#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
-#define T1 "write before unlink\n"
-#define T2 "write after unlink\n"
+#define T1 "write data before unlink\n"
+#define T2 "write data after unlink\n"
char buf[128];
int main(int argc, char **argv)
{
+ char *fname, *fname2;
+ struct stat st;
int fd, rc;
- if (argc != 2) {
- fprintf(stderr, "usage: %s filename\n", argv[0]);
+ if (argc < 2 || argc > 3) {
+ fprintf(stderr, "usage: %s filename [filename2]\n", argv[0]);
exit(1);
- } else {
- fprintf(stderr, "congratulations - program starting\n");
}
+ fname = argv[1];
+ if (argc == 3)
+ fname2 = argv[2];
+ else
+ fname2 = argv[1];
+
fprintf(stderr, "opening\n");
- fd = open(argv[1], O_RDWR | O_TRUNC | O_CREAT, 0644);
+ fd = open(fname, O_RDWR | O_TRUNC | O_CREAT, 0644);
if (fd == -1) {
fprintf(stderr, "open (normal) %s\n", strerror(errno));
exit(1);
fprintf(stderr, "writing\n");
rc = write(fd, T1, strlen(T1) + 1);
if (rc != strlen(T1) + 1) {
- fprintf(stderr, "write (normal) %s\n", strerror(errno));
+ fprintf(stderr, "write (normal) %s (rc %d)\n",
+ strerror(errno), rc);
exit(1);
}
- fprintf(stderr, "closing\n");
- rc = close(fd);
+ if (argc == 3) {
+ fprintf (stderr, "unlinking %s\n", fname2);
+ rc = unlink(fname2);
+ if (rc) {
+ fprintf(stderr, "unlink %s\n", strerror(errno));
+ exit(1);
+ }
+ } else {
+ printf("unlink %s and press enter\n", fname);
+ getc(stdin);
+ }
+
+ if (access(fname, F_OK) == 0) {
+ fprintf(stderr, "%s still exists\n", fname2);
+ exit(1);
+ }
+
+ fprintf(stderr, "resetting fd offset\n");
+ rc = lseek(fd, 0, SEEK_SET);
if (rc) {
- fprintf(stderr, "close (normal) %s\n", strerror(errno));
+ fprintf(stderr, "seek %s\n", strerror(errno));
exit(1);
}
- fprintf(stderr, "opening again\n");
- fd = open(argv[1], O_RDWR);
- if (fd == -1) {
- fprintf(stderr, "open (unlink) %s\n", strerror(errno));
+ if (access(fname, F_OK) == 0) {
+ fprintf(stderr, "%s still exists\n", fname);
exit(1);
}
-#if 0
- fprintf(stderr, "unlinking\n");
- rc = unlink(argv[1]);
+ fprintf(stderr, "fstat...\n");
+ rc = fstat(fd, &st);
if (rc) {
- fprintf(stderr, "unlink %s\n", strerror(errno));
+ fprintf(stderr, "fstat (unlink) %s\n", strerror(errno));
exit(1);
}
-#else
- printf("unlink %s and press enter\n", argv[1]);
- getc(stdin);
-#endif
+ if (st.st_nlink != 0)
+ fprintf(stderr, "st_nlink = %d\n", (int)st.st_nlink);
fprintf(stderr, "reading\n");
rc = read(fd, buf, strlen(T1) + 1);
if (rc != strlen(T1) + 1) {
- fprintf(stderr, "read (unlink) %s rc %d\n",
+ fprintf(stderr, "read (unlink) %s (rc %d)\n",
strerror(errno), rc);
exit(1);
}
fprintf(stderr, "truncating\n");
rc = ftruncate(fd, 0);
- if (rc ) {
+ if (rc) {
fprintf(stderr, "truncate (unlink) %s\n", strerror(errno));
exit(1);
}
fprintf(stderr, "reading again\n");
rc = read(fd, buf, strlen(T2) + 1);
if (rc != strlen(T2) + 1) {
- fprintf(stderr, "read (after unlink rewrite) %s\n",
- strerror(errno));
+ fprintf(stderr, "read (after unlink rewrite) %s (rc %d)\n",
+ strerror(errno), rc);
exit(1);
}
exit(1);
}
- fprintf(stderr, "closing again\n");
+ fprintf(stderr, "closing\n");
rc = close(fd);
if (rc) {
fprintf(stderr, "close (unlink) %s\n", strerror(errno));