203 lines
6.0 KiB
C
203 lines
6.0 KiB
C
/*
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* Copyright (C) 2003-2018 D. Gilbert
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This is a simple program that tests the O_EXCL flag in sg while
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* executing a SCSI INQUIRY command and a
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* TEST UNIT READY command using the SCSI generic (sg) driver
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*
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* Invocation: sg_excl [-x] <sg_device>
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*
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* Version 3.62 (20181227)
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*
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* 6 byte INQUIRY command:
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* [0x12][ |lu][pg cde][res ][al len][cntrl ]
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*
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* 6 byte TEST UNIT READY command:
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* [0x00][ |lu][res ][res ][res ][res ]
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*
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "sg_lib.h"
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#include "sg_io_linux.h"
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#define INQ_REPLY_LEN 96
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#define INQ_CMD_LEN 6
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#define TUR_CMD_LEN 6
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#define EBUFF_SZ 256
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#define ME "sg_excl: "
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int main(int argc, char * argv[])
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{
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int sg_fd, k, ok /*, sg_fd2 */;
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uint8_t inq_cdb [INQ_CMD_LEN] = {0x12, 0, 0, 0, INQ_REPLY_LEN, 0};
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uint8_t tur_cdb [TUR_CMD_LEN] = {0x00, 0, 0, 0, 0, 0};
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uint8_t inqBuff[INQ_REPLY_LEN];
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sg_io_hdr_t io_hdr;
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char * file_name = 0;
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char ebuff[EBUFF_SZ];
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uint8_t sense_buffer[32];
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int do_extra = 0;
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for (k = 1; k < argc; ++k) {
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if (0 == memcmp("-x", argv[k], 2))
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do_extra = 1;
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else if (*argv[k] == '-') {
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printf("Unrecognized switch: %s\n", argv[k]);
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file_name = 0;
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break;
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}
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else if (0 == file_name)
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file_name = argv[k];
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else {
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printf("too many arguments\n");
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file_name = 0;
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break;
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}
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}
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if (0 == file_name) {
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printf("Usage: 'sg_excl [-x] <sg_device>'\n");
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return 1;
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}
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/* N.B. An access mode of O_RDWR is required for some SCSI commands */
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if ((sg_fd = open(file_name, O_RDWR | O_EXCL | O_NONBLOCK)) < 0) {
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snprintf(ebuff, EBUFF_SZ, ME "error opening file: %s", file_name);
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perror(ebuff);
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return 1;
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}
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/* Just to be safe, check we have a new sg device by trying an ioctl */
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if ((ioctl(sg_fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) {
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printf(ME "%s doesn't seem to be an new sg device\n",
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file_name);
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close(sg_fd);
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return 1;
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}
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#if 0
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if ((sg_fd2 = open(file_name, O_RDWR | O_EXCL)) < 0) {
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snprintf(ebuff, EBUFF_SZ,
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ME "error opening file: %s a second time", file_name);
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perror(ebuff);
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return 1;
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} else {
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printf(ME "second open of %s in violation of O_EXCL\n", file_name);
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close(sg_fd2);
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}
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#endif
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/* Prepare INQUIRY command */
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memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
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io_hdr.interface_id = 'S';
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io_hdr.cmd_len = sizeof(inq_cdb);
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/* io_hdr.iovec_count = 0; */ /* memset takes care of this */
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io_hdr.mx_sb_len = sizeof(sense_buffer);
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io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
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io_hdr.dxfer_len = INQ_REPLY_LEN;
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io_hdr.dxferp = inqBuff;
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io_hdr.cmdp = inq_cdb;
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io_hdr.sbp = sense_buffer;
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io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */
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/* io_hdr.flags = 0; */ /* take defaults: indirect IO, etc */
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/* io_hdr.pack_id = 0; */
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/* io_hdr.usr_ptr = NULL; */
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if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
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perror(ME "Inquiry SG_IO ioctl error");
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close(sg_fd);
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return 1;
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}
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/* now for the error processing */
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ok = 0;
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switch (sg_err_category3(&io_hdr)) {
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case SG_LIB_CAT_CLEAN:
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ok = 1;
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break;
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case SG_LIB_CAT_RECOVERED:
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printf("Recovered error on INQUIRY, continuing\n");
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ok = 1;
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break;
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default: /* won't bother decoding other categories */
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sg_chk_n_print3("INQUIRY command error", &io_hdr, 1);
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break;
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}
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if (ok) { /* output result if it is available */
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char * p = (char *)inqBuff;
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int f = (int)*(p + 7);
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printf("Some of the INQUIRY command's results:\n");
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printf(" %.8s %.16s %.4s ", p + 8, p + 16, p + 32);
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printf("[wide=%d sync=%d cmdque=%d sftre=%d]\n",
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!!(f & 0x20), !!(f & 0x10), !!(f & 2), !!(f & 1));
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/* Extra info, not necessary to look at */
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if (do_extra)
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printf("INQUIRY duration=%u millisecs, resid=%d, msg_status=%d\n",
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io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status);
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}
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/* Prepare TEST UNIT READY command */
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memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
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io_hdr.interface_id = 'S';
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io_hdr.cmd_len = sizeof(tur_cdb);
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io_hdr.mx_sb_len = sizeof(sense_buffer);
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io_hdr.dxfer_direction = SG_DXFER_NONE;
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io_hdr.cmdp = tur_cdb;
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io_hdr.sbp = sense_buffer;
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io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */
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if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
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perror(ME "Test Unit Ready SG_IO ioctl error");
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close(sg_fd);
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return 1;
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}
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/* now for the error processing */
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ok = 0;
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switch (sg_err_category3(&io_hdr)) {
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case SG_LIB_CAT_CLEAN:
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ok = 1;
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break;
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case SG_LIB_CAT_RECOVERED:
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printf("Recovered error on Test Unit Ready, continuing\n");
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ok = 1;
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break;
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default: /* won't bother decoding other categories */
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sg_chk_n_print3("Test Unit Ready command error", &io_hdr, 1);
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break;
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}
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if (ok)
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printf("Test Unit Ready successful so unit is ready!\n");
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else
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printf("Test Unit Ready failed so unit may _not_ be ready!\n");
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if (do_extra)
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printf("TEST UNIT READY duration=%u millisecs, resid=%d, "
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"msg_status=%d\n", io_hdr.duration, io_hdr.resid,
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(int)io_hdr.msg_status);
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printf("Wait for 60 seconds with O_EXCL help on %s\n", file_name);
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sleep(60);
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close(sg_fd);
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return 0;
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}
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