/* * Copyright (C) 2007 Nokia Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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 St, Fifth Floor, Boston, MA * 02110-1301 USA * * Author: Adrian Hunter */ #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <stdint.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include "tests.h" #define WRITE_BUFFER_SIZE 32768 void ftrunc(void) { int fd, i; pid_t pid; ssize_t written; int64_t remains; size_t block; char *file_name; off_t actual; char buf[WRITE_BUFFER_SIZE]; file_name = "ftrunc_test_file"; fd = open(file_name, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH); CHECK(fd != -1); pid = getpid(); srand(pid); for (i = 0; i < WRITE_BUFFER_SIZE;++i) buf[i] = rand(); remains = tests_size_parameter; actual = 0; while (remains > 0) { if (remains > WRITE_BUFFER_SIZE) block = WRITE_BUFFER_SIZE; else block = remains; written = write(fd, buf, block); if (written <= 0) { CHECK(errno == ENOSPC); /* File system full */ errno = 0; break; } remains -= written; actual += written; } CHECK(ftruncate(fd, (actual ? actual - 1 : actual)) != -1); CHECK(close(fd) != -1); CHECK(unlink(file_name) != -1); } /* Title of this test */ const char *ftrunc_get_title(void) { return "Truncate a large test file"; } /* Description of this test */ const char *ftrunc_get_description(void) { return "Create a file named ftrunc_test_file. " \ "Truncate the file to reduce its length by 1. " \ "Then remove the truncated file. " "The size is given by the -z or --size option, " \ "otherwise it defaults to 1000000."; } int main(int argc, char *argv[]) { int run_test; /* Set default test file size */ tests_size_parameter = 1000000; /* Handle common arguments */ run_test = tests_get_args(argc, argv, ftrunc_get_title(), ftrunc_get_description(), "z"); if (!run_test) return 1; /* Change directory to the file system and check it is ok for testing */ tests_check_test_file_system(); /* Do the actual test */ ftrunc(); return 0; }