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largest_file.c
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Editing: largest_file.c
/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright (c) 2012 by Delphix. All rights reserved. */ #include "../file_common.h" #include <sys/param.h> #include <signal.h> #include <stdio.h> #include <string.h> #include <sys/stdtypes.h> #include <unistd.h> /* * -------------------------------------------------------------- * * Assertion: * The last byte of the largest file size can be * accessed without any errors. Also, the writing * beyond the last byte of the largest file size * will produce an errno of EFBIG. * * -------------------------------------------------------------- * If the write() system call below returns a "1", * then the last byte can be accessed. * -------------------------------------------------------------- */ static void sigxfsz(int); static void usage(char *); int main(int argc, char **argv) { int fd = 0; offset_t offset = (MAXOFFSET_T - 1); offset_t llseek_ret = 0; int write_ret = 0; int err = 0; char mybuf[5] = "aaaa\0"; char *testfile; mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; struct sigaction sa; if (argc != 2) { usage(argv[0]); } if (sigemptyset(&sa.sa_mask) == -1) return (errno); sa.sa_flags = 0; sa.sa_handler = sigxfsz; if (sigaction(SIGXFSZ, &sa, NULL) == -1) return (errno); testfile = strdup(argv[1]); fd = open(testfile, O_CREAT | O_RDWR, mode); if (fd < 0) { err = errno; perror("Failed to create testfile"); free(testfile); return (err); } llseek_ret = lseek64(fd, offset, SEEK_SET); if (llseek_ret < 0) { err = errno; perror("Failed to seek to end of testfile"); goto out; } write_ret = write(fd, mybuf, 1); if (write_ret < 0) { err = errno; perror("Failed to write to end of file"); goto out; } offset = 0; llseek_ret = lseek64(fd, offset, SEEK_CUR); if (llseek_ret < 0) { err = errno; perror("Failed to seek to end of file"); goto out; } write_ret = write(fd, mybuf, 1); if (write_ret < 0) { if (errno == EFBIG || errno == EINVAL) { (void) printf("write errno=EFBIG|EINVAL: success\n"); err = 0; } else { err = errno; perror("Did not receive EFBIG"); } } else { (void) printf("write completed successfully, test failed\n"); err = 1; } out: (void) unlink(testfile); free(testfile); close(fd); return (err); } static void usage(char *name) { (void) printf("%s <testfile>\n", name); exit(1); } /* ARGSUSED */ static void sigxfsz(int signo) { (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); }
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