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Diffstat (limited to 'src/sg_prevent.c')
| -rw-r--r-- | src/sg_prevent.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/sg_prevent.c b/src/sg_prevent.c new file mode 100644 index 00000000..b2076c54 --- /dev/null +++ b/src/sg_prevent.c @@ -0,0 +1,193 @@ +/* + * Copyright (c) 2004-2022 Douglas Gilbert. + * All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the BSD_LICENSE file. + * + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <stdbool.h> +#include <string.h> +#include <getopt.h> + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#include "sg_lib.h" +#include "sg_cmds_basic.h" +#include "sg_pr2serr.h" + +/* A utility program originally written for the Linux OS SCSI subsystem. + * + * This program issues the SCSI PREVENT ALLOW MEDIUM REMOVAL command to the + * given SCSI device. + */ + +static const char * version_str = "1.13 20220826"; + +#define ME "sg_prevent: " + + +static struct option long_options[] = { + {"allow", no_argument, 0, 'a'}, + {"help", no_argument, 0, 'h'}, + {"prevent", required_argument, 0, 'p'}, + {"verbose", no_argument, 0, 'v'}, + {"version", no_argument, 0, 'V'}, + {0, 0, 0, 0}, +}; + + +static void +usage() +{ + pr2serr("Usage: " + "sg_prevent [--allow] [--help] [--prevent=PC] [--verbose] " + "[--version]\n" + " DEVICE\n" + " where:\n" + " --allow|-a allow media removal\n" + " --help|-h print usage message then exit\n" + " --prevent=PC|-p PC prevent code value (def: 1 -> " + "prevent)\n" + " 0 -> allow, 1 -> prevent\n" + " 2 -> persistent allow, 3 -> " + "persistent prevent\n" + " --verbose|-v increase verbosity\n" + " --version|-V print version string and exit\n\n" + "Performs a SCSI PREVENT ALLOW MEDIUM REMOVAL command\n"); + +} + +int +main(int argc, char * argv[]) +{ + bool allow = false; + bool verbose_given = false; + bool version_given = false; + int sg_fd, res, c; + int prevent = -1; + int verbose = 0; + const char * device_name = NULL; + int ret = 0; + + while (1) { + int option_index = 0; + + c = getopt_long(argc, argv, "ahp:vV", long_options, + &option_index); + if (c == -1) + break; + + switch (c) { + case 'a': + allow = true; + break; + case 'h': + case '?': + usage(); + return 0; + case 'p': + prevent = sg_get_num(optarg); + if ((prevent < 0) || (prevent > 3)) { + pr2serr("bad argument to '--prevent'\n"); + return SG_LIB_SYNTAX_ERROR; + } + break; + case 'v': + verbose_given = true; + ++verbose; + break; + case 'V': + version_given = true; + break; + default: + pr2serr("unrecognised option code 0x%x ??\n", c); + usage(); + return SG_LIB_SYNTAX_ERROR; + } + } + if (optind < argc) { + if (NULL == device_name) { + device_name = argv[optind]; + ++optind; + } + if (optind < argc) { + for (; optind < argc; ++optind) + pr2serr("Unexpected extra argument: %s\n", argv[optind]); + usage(); + return SG_LIB_SYNTAX_ERROR; + } + } +#ifdef DEBUG + pr2serr("In DEBUG mode, "); + if (verbose_given && version_given) { + pr2serr("but override: '-vV' given, zero verbose and continue\n"); + verbose_given = false; + version_given = false; + verbose = 0; + } else if (! verbose_given) { + pr2serr("set '-vv'\n"); + verbose = 2; + } else + pr2serr("keep verbose=%d\n", verbose); +#else + if (verbose_given && version_given) + pr2serr("Not in DEBUG mode, so '-vV' has no special action\n"); +#endif + if (version_given) { + pr2serr(ME "version: %s\n", version_str); + return 0; + } + + if (NULL == device_name) { + pr2serr("missing device name!\n"); + usage(); + return SG_LIB_SYNTAX_ERROR; + } + if (allow && (prevent >= 0)) { + pr2serr("can't give both '--allow' and '--prevent='\n"); + usage(); + return SG_LIB_CONTRADICT; + } + if (allow) + prevent = 0; + else if (prevent < 0) + prevent = 1; /* default is to prevent, as utility name suggests */ + + sg_fd = sg_cmds_open_device(device_name, false /* rw */, verbose); + if (sg_fd < 0) { + if (verbose) + pr2serr(ME "open error: %s: %s\n", device_name, + safe_strerror(-sg_fd)); + ret = sg_convert_errno(-sg_fd); + goto fini; + } + res = sg_ll_prevent_allow(sg_fd, prevent, true, verbose); + ret = res; + if (res) { + char b[80]; + + sg_get_category_sense_str(res, sizeof(b), b, verbose); + pr2serr("Prevent allow medium removal: %s\n", b); + } + res = sg_cmds_close_device(sg_fd); + if (res < 0) { + pr2serr("close error: %s\n", safe_strerror(-res)); + if (0 == ret) + ret = sg_convert_errno(-res); + } +fini: + if (0 == verbose) { + if (! sg_if_can2stderr("sg_prevent failed: ", ret)) + pr2serr("Some error occurred, try again with '-v' " + "or '-vv' for more information\n"); + } + return (ret >= 0) ? ret : SG_LIB_CAT_OTHER; +} |