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Diffstat (limited to 'examples/sg_simple2.c')
| -rw-r--r-- | examples/sg_simple2.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/examples/sg_simple2.c b/examples/sg_simple2.c new file mode 100644 index 00000000..a0710be5 --- /dev/null +++ b/examples/sg_simple2.c @@ -0,0 +1,197 @@ +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include "sg_linux_inc.h" + +/* This is a simple program executing a SCSI INQUIRY command and a + TEST UNIT READY command using the SCSI generic (sg) driver. + There is another variant of this program called "sg_simple1" + which includes the sg_lib.h header and logic and so has more + advanced error processing. + This version demonstrates the "sg3" interface. + In the lk 2.6 series devices nodes such as /dev/sda also support + the SG_IO ioctl. + +* Copyright (C) 1999-2016 D. Gilbert +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2, or (at your option) +* any later version. + + Invocation: sg_simple2 [-x] <scsi_device> + + Version 03.59 (20160528) + +6 byte INQUIRY command: +[0x12][ |lu][pg cde][res ][al len][cntrl ] + +6 byte TEST UNIT READY command: +[0x00][ |lu][res ][res ][res ][res ] + +*/ + +#define INQ_REPLY_LEN 96 /* logic assumes >= sizeof(inq_cdb) */ +#define INQ_CMD_LEN 6 +#define TUR_CMD_LEN 6 + +#define EBUFF_SZ 256 + + +int main(int argc, char * argv[]) +{ + int sg_fd, k; + unsigned char inq_cdb[INQ_CMD_LEN] = + {0x12, 0, 0, 0, INQ_REPLY_LEN, 0}; + unsigned char tur_cdb[TUR_CMD_LEN] = + {0x00, 0, 0, 0, 0, 0}; + unsigned char inqBuff[INQ_REPLY_LEN]; + sg_io_hdr_t io_hdr; + char * file_name = 0; + char ebuff[EBUFF_SZ]; + unsigned char sense_buffer[32]; + int do_extra = 0; + + for (k = 1; k < argc; ++k) { + if (0 == memcmp("-x", argv[k], 2)) + do_extra = 1; + else if (*argv[k] == '-') { + printf("Unrecognized switch: %s\n", argv[k]); + file_name = 0; + break; + } + else if (0 == file_name) + file_name = argv[k]; + else { + printf("too many arguments\n"); + file_name = 0; + break; + } + } + if (0 == file_name) { + printf("Usage: 'sg_simple2 [-x] <sg_device>'\n"); + return 1; + } + + /* N.B. An access mode of O_RDWR is required for some SCSI commands */ + if ((sg_fd = open(file_name, O_RDONLY)) < 0) { + snprintf(ebuff, EBUFF_SZ, + "sg_simple2: error opening file: %s", file_name); + perror(ebuff); + return 1; + } + /* Just to be safe, check we have a new sg device by trying an ioctl */ + if ((ioctl(sg_fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) { + printf("sg_simple2: %s doesn't seem to be an new sg device\n", + file_name); + close(sg_fd); + return 1; + } + + /* Prepare INQUIRY command */ + memset(&io_hdr, 0, sizeof(sg_io_hdr_t)); + io_hdr.interface_id = 'S'; + io_hdr.cmd_len = sizeof(inq_cdb); + /* io_hdr.iovec_count = 0; */ /* memset takes care of this */ + io_hdr.mx_sb_len = sizeof(sense_buffer); + io_hdr.dxfer_direction = SG_DXFER_FROM_DEV; + io_hdr.dxfer_len = INQ_REPLY_LEN; + io_hdr.dxferp = inqBuff; + io_hdr.cmdp = inq_cdb; + io_hdr.sbp = sense_buffer; + io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */ + /* io_hdr.flags = 0; */ /* take defaults: indirect IO, etc */ + /* io_hdr.pack_id = 0; */ + /* io_hdr.usr_ptr = NULL; */ + + if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) { + perror("sg_simple2: Inquiry SG_IO ioctl error"); + close(sg_fd); + return 1; + } + + /* now for the error processing */ + if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) { + if (io_hdr.sb_len_wr > 0) { + printf("INQUIRY sense data: "); + for (k = 0; k < io_hdr.sb_len_wr; ++k) { + if ((k > 0) && (0 == (k % 10))) + printf("\n "); + printf("0x%02x ", sense_buffer[k]); + } + printf("\n"); + } + if (io_hdr.masked_status) + printf("INQUIRY SCSI status=0x%x\n", io_hdr.status); + if (io_hdr.host_status) + printf("INQUIRY host_status=0x%x\n", io_hdr.host_status); + if (io_hdr.driver_status) + printf("INQUIRY driver_status=0x%x\n", io_hdr.driver_status); + } + else { /* output result if it is available */ + char * p = (char *)inqBuff; + int f = (int)*(p + 7); + printf("Some of the INQUIRY command's results:\n"); + printf(" %.8s %.16s %.4s ", p + 8, p + 16, p + 32); + printf("[wide=%d sync=%d cmdque=%d sftre=%d]\n", + !!(f & 0x20), !!(f & 0x10), !!(f & 2), !!(f & 1)); + } + /* Extra info, not necessary to look at */ + if (do_extra) + printf("INQUIRY duration=%u millisecs, resid=%d, msg_status=%d\n", + io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status); + + /* Prepare TEST UNIT READY command */ + memset(&io_hdr, 0, sizeof(sg_io_hdr_t)); + io_hdr.interface_id = 'S'; + io_hdr.cmd_len = sizeof(tur_cdb); + io_hdr.mx_sb_len = sizeof(sense_buffer); + io_hdr.dxfer_direction = SG_DXFER_NONE; + io_hdr.cmdp = tur_cdb; + io_hdr.sbp = sense_buffer; + io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */ + + if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) { + perror("sg_simple2: Test Unit Ready SG_IO ioctl error"); + close(sg_fd); + return 1; + } + + /* now for the error processing */ + if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) { + if (io_hdr.sb_len_wr > 0) { + printf("TEST UNIT READY sense data: "); + for (k = 0; k < io_hdr.sb_len_wr; ++k) { + if ((k > 0) && (0 == (k % 10))) + printf("\n "); + printf("0x%02x ", sense_buffer[k]); + } + printf("\n"); + } + else if (io_hdr.masked_status) + printf("TEST UNIT READY SCSI status=0x%x\n", io_hdr.status); + else if (io_hdr.host_status) + printf("TEST UNIT READY host_status=0x%x\n", io_hdr.host_status); + else if (io_hdr.driver_status) + printf("TEST UNIT READY driver_status=0x%x\n", + io_hdr.driver_status); + else + printf("TEST UNIT READY unexpected error\n"); + printf("Test Unit Ready failed so unit may _not_ be ready!\n"); + } + else + printf("Test Unit Ready successful so unit is ready!\n"); + /* Extra info, not necessary to look at */ + if (do_extra) + printf("TEST UNIT READY duration=%u millisecs, resid=%d, " + "msg_status=%d\n", io_hdr.duration, io_hdr.resid, + (int)io_hdr.msg_status); + + close(sg_fd); + return 0; +} |