failtest: fix fascist warn_unused_result warnings
[ccan] / ccan / failtest / failtest.c
index b25b049edac1d162c663ae58218c75dc3815e0dd..30903e3f3c4ecf232d474e2d09bc82f5238e777c 100644 (file)
@@ -248,7 +248,8 @@ static struct saved_file *save_file(struct saved_file *next, int fd)
        s->len = lseek(fd, 0, SEEK_END);
        lseek(fd, 0, SEEK_SET);
        s->contents = malloc(s->len);
        s->len = lseek(fd, 0, SEEK_END);
        lseek(fd, 0, SEEK_SET);
        s->contents = malloc(s->len);
-       read(fd, s->contents, s->len);
+       if (read(fd, s->contents, s->len) != s->len)
+               err(1, "Failed to save %zu bytes", (size_t)s->len);
        lseek(fd, s->off, SEEK_SET);
        return s;
 }
        lseek(fd, s->off, SEEK_SET);
        return s;
 }
@@ -293,8 +294,11 @@ static void restore_files(struct saved_file *s)
                struct saved_file *next = s->next;
 
                lseek(s->fd, 0, SEEK_SET);
                struct saved_file *next = s->next;
 
                lseek(s->fd, 0, SEEK_SET);
-               write(s->fd, s->contents, s->len);
-               ftruncate(s->fd, s->len);
+               if (write(s->fd, s->contents, s->len) != s->len)
+                       err(1, "Failed to restore %zu bytes", (size_t)s->len);
+               if (ftruncate(s->fd, s->len) != 0)
+                       err(1, "Failed to trim file to length %zu",
+                           (size_t)s->len);
                free(s->contents);
                lseek(s->fd, s->off, SEEK_SET);
                free(s);
                free(s->contents);
                lseek(s->fd, s->off, SEEK_SET);
                free(s);
@@ -395,8 +399,8 @@ static bool should_fail(struct failtest_call *call)
                        signal(SIGUSR1, SIG_IGN);
                        sprintf(str, "xterm -e gdb /proc/%d/exe %d &",
                                getpid(), getpid());
                        signal(SIGUSR1, SIG_IGN);
                        sprintf(str, "xterm -e gdb /proc/%d/exe %d &",
                                getpid(), getpid());
-                       system(str);
-                       sleep(5);
+                       if (system(str) == 0)
+                               sleep(5);
                }
        }
 
                }
        }