+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include <getopt.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-#include <unistd.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <byteswap.h>
-#include <inttypes.h>
-#include <stdbool.h>
-
-#include <version.h>
-#include <lttng/lttng.h>
-#include <common/common.h>
-#include <common/utils.h>
-
-#define DEFAULT_VIEWER "babeltrace"
-
-#define COPY_BUFLEN 4096
-#define RB_CRASH_DUMP_ABI_LEN 32
-
-#define RB_CRASH_DUMP_ABI_MAGIC_LEN 16
-
-/*
- * The 128-bit magic number is xor'd in the process data so it does not
- * cause a false positive when searching for buffers by scanning memory.
- * The actual magic number is:
- * 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17, 0x7B, 0xF1,
- * 0x77, 0xBF, 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17,
- */
-#define RB_CRASH_DUMP_ABI_MAGIC_XOR \
- { \
- 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, 0x77 ^ 0xFF, \
- 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, \
- 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, \
- 0xF1 ^ 0xFF, 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, \
- }
-
-/*
- * Non-static to ensure the compiler does not optimize away the xor.
- */
-uint8_t lttng_crash_expected_magic_xor[] = RB_CRASH_DUMP_ABI_MAGIC_XOR;
-
-#define RB_CRASH_ENDIAN 0x1234
-#define RB_CRASH_ENDIAN_REVERSE 0x3412
-
-enum lttng_crash_type {
- LTTNG_CRASH_TYPE_UST = 0,
- LTTNG_CRASH_TYPE_KERNEL = 1,
-};
-
-/* LTTng ring buffer defines (copied) */
-
-#define HALF_ULONG_BITS(wl) (((wl) * CHAR_BIT) >> 1)
-
-#define SB_ID_OFFSET_SHIFT(wl) (HALF_ULONG_BITS(wl) + 1)
-#define SB_ID_OFFSET_COUNT(wl) (1UL << SB_ID_OFFSET_SHIFT(wl))
-#define SB_ID_OFFSET_MASK(wl) (~(SB_ID_OFFSET_COUNT(wl) - 1))
-/*
- * Lowest bit of top word half belongs to noref. Used only for overwrite mode.
- */
-#define SB_ID_NOREF_SHIFT(wl) (SB_ID_OFFSET_SHIFT(wl) - 1)
-#define SB_ID_NOREF_COUNT(wl) (1UL << SB_ID_NOREF_SHIFT(wl))
-#define SB_ID_NOREF_MASK(wl) SB_ID_NOREF_COUNT(wl)
-/*
- * In overwrite mode: lowest half of word is used for index.
- * Limit of 2^16 subbuffers per buffer on 32-bit, 2^32 on 64-bit.
- * In producer-consumer mode: whole word used for index.
- */
-#define SB_ID_INDEX_SHIFT(wl) 0
-#define SB_ID_INDEX_COUNT(wl) (1UL << SB_ID_INDEX_SHIFT(wl))
-#define SB_ID_INDEX_MASK(wl) (SB_ID_NOREF_COUNT(wl) - 1)
-
-enum rb_modes {
- RING_BUFFER_OVERWRITE = 0, /* Overwrite when buffer full */
- RING_BUFFER_DISCARD = 1, /* Discard when buffer full */
-};
-
-struct crash_abi_unknown {
- uint8_t magic[RB_CRASH_DUMP_ABI_MAGIC_LEN];
- uint64_t mmap_length; /* Overall length of crash record */
- uint16_t endian; /*
- * { 0x12, 0x34 }: big endian
- * { 0x34, 0x12 }: little endian
- */
- uint16_t major; /* Major number. */
- uint16_t minor; /* Minor number. */
- uint8_t word_size; /* Word size (bytes). */
- uint8_t layout_type; /* enum lttng_crash_layout */
-} __attribute__((packed));
-
-struct crash_abi_0_0 {
- struct crash_abi_unknown parent;
-
- struct {
- uint32_t prod_offset;
- uint32_t consumed_offset;
- uint32_t commit_hot_array;
- uint32_t commit_hot_seq;
- uint32_t buf_wsb_array;
- uint32_t buf_wsb_id;
- uint32_t sb_array;
- uint32_t sb_array_shmp_offset;
- uint32_t sb_backend_p_offset;
- uint32_t content_size;
- uint32_t packet_size;
- } __attribute__((packed)) offset;
- struct {
- uint8_t prod_offset;
- uint8_t consumed_offset;
- uint8_t commit_hot_seq;
- uint8_t buf_wsb_id;
- uint8_t sb_array_shmp_offset;
- uint8_t sb_backend_p_offset;
- uint8_t content_size;
- uint8_t packet_size;
- } __attribute__((packed)) length;
- struct {
- uint32_t commit_hot_array;
- uint32_t buf_wsb_array;
- uint32_t sb_array;
- } __attribute__((packed)) stride;
-
- uint64_t buf_size; /* Size of the buffer */
- uint64_t subbuf_size; /* Sub-buffer size */
- uint64_t num_subbuf; /* Number of sub-buffers for writer */
- uint32_t mode; /* Buffer mode: 0: overwrite, 1: discard */
-} __attribute__((packed));
-
-struct lttng_crash_layout {
- struct {
- int prod_offset, consumed_offset,
- commit_hot_array, commit_hot_seq,
- buf_wsb_array, buf_wsb_id,
- sb_array, sb_array_shmp_offset,
- sb_backend_p_offset, content_size,
- packet_size;
- } offset;
- struct {
- int prod_offset, consumed_offset,
- commit_hot_seq, buf_wsb_id,
- sb_array_shmp_offset, sb_backend_p_offset,
- content_size, packet_size;
- } length;
- struct {
- int commit_hot_array, buf_wsb_array, sb_array;
- } stride;
-
- int reverse_byte_order;
- int word_size;
-
- uint64_t mmap_length; /* Length of crash record */
- uint64_t buf_size; /* Size of the buffer */
- uint64_t subbuf_size; /* Sub-buffer size */
- uint64_t num_subbuf; /* Number of sub-buffers for writer */
- uint32_t mode; /* Buffer mode: 0: overwrite, 1: discard */
-};
-
-/* Variables */
-static char *progname,
- *opt_viewer_path = NULL,
- *opt_output_path = NULL;
-
-static char *input_path;
-
-int lttng_opt_quiet, lttng_opt_verbose, lttng_opt_mi;
-
-enum {
- OPT_DUMP_OPTIONS,
-};
-
-/* Getopt options. No first level command. */
-static struct option long_options[] = {
- { "version", 0, NULL, 'V' },
- { "help", 0, NULL, 'h' },
- { "verbose", 0, NULL, 'v' },
- { "viewer", 1, NULL, 'e' },
- { "extract", 1, NULL, 'x' },
- { "list-options", 0, NULL, OPT_DUMP_OPTIONS },
- { NULL, 0, NULL, 0 },
-};
-
-static void usage(void)
-{
- int ret = utils_show_man_page(1, "lttng-crash");
-
- if (ret) {
- ERR("Cannot view man page lttng-crash(1)");
- perror("exec");
- exit(EXIT_FAILURE);
- }
-}
-
-static void version(FILE *ofp)
-{
- fprintf(ofp, "%s (LTTng Crash Trace Viewer) " VERSION " - " VERSION_NAME
-"%s\n",
- progname,
- GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION);
-}
-
-/*
- * list_options
- *
- * List options line by line. This is mostly for bash auto completion and to
- * avoid difficult parsing.
- */
-static void list_options(FILE *ofp)
-{
- int i = 0;
- struct option *option = NULL;
-
- option = &long_options[i];
- while (option->name != NULL) {
- fprintf(ofp, "--%s\n", option->name);
-
- if (isprint(option->val)) {
- fprintf(ofp, "-%c\n", option->val);
- }
-
- i++;
- option = &long_options[i];
- }
-}
-
-/*
- * Parse command line arguments.
- *
- * Return 0 if OK, else -1
- */
-static int parse_args(int argc, char **argv)
-{
- int opt, ret = 0;
-
- if (argc < 2) {
- usage();
- exit(EXIT_FAILURE);
- }
-
- while ((opt = getopt_long(argc, argv, "+Vhve:x:", long_options, NULL)) != -1) {
- switch (opt) {
- case 'V':
- version(stdout);
- ret = 1;
- goto end;
- case 'h':
- usage();
- ret = 1;
- goto end;
- case 'v':
- /* There is only 3 possible level of verbosity. (-vvv) */
- if (lttng_opt_verbose < 3) {
- lttng_opt_verbose += 1;
- }
- break;
- case 'e':
- free(opt_viewer_path);
- opt_viewer_path = strdup(optarg);
- break;
- case 'x':
- free(opt_output_path);
- opt_output_path = strdup(optarg);
- break;
- case OPT_DUMP_OPTIONS:
- list_options(stdout);
- ret = 1;
- goto end;
- default:
- ERR("Unknown command-line option");
- goto error;
- }
- }
-
- if (!opt_viewer_path) {
- opt_viewer_path = DEFAULT_VIEWER;
- }
-
- /* No leftovers, or more than one input path, print usage and quit */
- if (argc - optind != 1) {
- ERR("Command-line error: Specify exactly one input path");
- goto error;
- }
-
- input_path = argv[optind];
-end:
- return ret;
-
-error:
- return -1;
-}
-
-static
-int copy_file(const char *file_dest, const char *file_src)
-{
- int fd_src = -1, fd_dest = -1;
- ssize_t readlen, writelen;
- char buf[COPY_BUFLEN];
- int ret;
-
- DBG("Copy metadata file '%s' into '%s'", file_src, file_dest);
-
- fd_src = open(file_src, O_RDONLY);
- if (fd_src < 0) {
- PERROR("Error opening %s for reading", file_src);
- ret = -errno;
- goto error;
- }
- fd_dest = open(file_dest, O_RDWR | O_CREAT | O_EXCL,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (fd_dest < 0) {
- PERROR("Error opening %s for writing", file_dest);
- ret = -errno;
- goto error;
- }
-
- for (;;) {
- readlen = lttng_read(fd_src, buf, COPY_BUFLEN);
- if (readlen < 0) {
- PERROR("Error reading input file");
- ret = -1;
- goto error;
- }
- if (!readlen) {
- break;
- }
- writelen = lttng_write(fd_dest, buf, readlen);
- if (writelen < readlen) {
- PERROR("Error writing to output file");
- ret = -1;
- goto error;
- }
- }
-
- ret = 0;
-error:
- if (fd_src >= 0) {
- if (close(fd_src) < 0) {
- PERROR("Error closing %s", file_src);
- }
- }
-
- if (fd_dest >= 0) {
- if (close(fd_dest) < 0) {
- PERROR("Error closing %s", file_dest);
- }
- }
- return ret;
-}
-
-static
-uint64_t _crash_get_field(const struct lttng_crash_layout *layout,
- const char *ptr, size_t size)
-{
- switch (size) {
- case 1: return *(uint8_t *) ptr;
- case 2: if (layout->reverse_byte_order) {
- return __bswap_16(*(uint16_t *) ptr);
- } else {
- return *(uint16_t *) ptr;
-
- }
- case 4: if (layout->reverse_byte_order) {
- return __bswap_32(*(uint32_t *) ptr);
- } else {
- return *(uint32_t *) ptr;
-
- }
- case 8: if (layout->reverse_byte_order) {
- return __bswap_64(*(uint64_t *) ptr);
- } else {
- return *(uint64_t *) ptr;
- }
- default:
- abort();
- return -1;
- }
-
-}
-
-#define crash_get_field(layout, map, name) \
- _crash_get_field(layout, (map) + (layout)->offset.name, \
- layout->length.name)
-
-#define crash_get_array_field(layout, map, array_name, idx, field_name) \
- _crash_get_field(layout, \
- (map) + (layout)->offset.array_name \
- + (idx * (layout)->stride.array_name) \
- + (layout)->offset.field_name, \
- (layout)->length.field_name)
-
-#define crash_get_hdr_raw_field(layout, hdr, name) ((hdr)->name)
-
-#define crash_get_hdr_field(layout, hdr, name) \
- _crash_get_field(layout, (const char *) &(hdr)->name, \
- sizeof((hdr)->name))
-
-#define crash_get_layout(layout, hdr, name) \
- do { \
- (layout)->name = crash_get_hdr_field(layout, hdr, \
- name); \
- DBG("layout.%s = %" PRIu64, #name, \
- (uint64_t) (layout)->name); \
- } while (0)
-
-static
-int get_crash_layout_0_0(struct lttng_crash_layout *layout,
- char *map)
-{
- const struct crash_abi_0_0 *abi = (const struct crash_abi_0_0 *) map;
-
- crash_get_layout(layout, abi, offset.prod_offset);
- crash_get_layout(layout, abi, offset.consumed_offset);
- crash_get_layout(layout, abi, offset.commit_hot_array);
- crash_get_layout(layout, abi, offset.commit_hot_seq);
- crash_get_layout(layout, abi, offset.buf_wsb_array);
- crash_get_layout(layout, abi, offset.buf_wsb_id);
- crash_get_layout(layout, abi, offset.sb_array);
- crash_get_layout(layout, abi, offset.sb_array_shmp_offset);
- crash_get_layout(layout, abi, offset.sb_backend_p_offset);
- crash_get_layout(layout, abi, offset.content_size);
- crash_get_layout(layout, abi, offset.packet_size);
-
- crash_get_layout(layout, abi, length.prod_offset);
- crash_get_layout(layout, abi, length.consumed_offset);
- crash_get_layout(layout, abi, length.commit_hot_seq);
- crash_get_layout(layout, abi, length.buf_wsb_id);
- crash_get_layout(layout, abi, length.sb_array_shmp_offset);
- crash_get_layout(layout, abi, length.sb_backend_p_offset);
- crash_get_layout(layout, abi, length.content_size);
- crash_get_layout(layout, abi, length.packet_size);
-
- crash_get_layout(layout, abi, stride.commit_hot_array);
- crash_get_layout(layout, abi, stride.buf_wsb_array);
- crash_get_layout(layout, abi, stride.sb_array);
-
- crash_get_layout(layout, abi, buf_size);
- crash_get_layout(layout, abi, subbuf_size);
- crash_get_layout(layout, abi, num_subbuf);
- crash_get_layout(layout, abi, mode);
-
- return 0;
-}
-
-static
-void print_dbg_magic(const uint8_t *magic)
-{
- DBG("magic: 0x%X%X%X%X%X%X%X%X%X%X%X%X%X%X%X%X",
- magic[0], magic[1], magic[2], magic[3],
- magic[4], magic[5], magic[6], magic[7],
- magic[8], magic[9], magic[10], magic[11],
- magic[12], magic[13], magic[14], magic[15]);
-}
-
-static
-int check_magic(const uint8_t *magic)
-{
- int i;
-
- for (i = 0; i < RB_CRASH_DUMP_ABI_MAGIC_LEN; i++) {
- if ((magic[i] ^ 0xFF) != lttng_crash_expected_magic_xor[i]) {
- return -1;
- }
- }
- return 0;
-}
-
-static
-int get_crash_layout(struct lttng_crash_layout *layout, int fd)
-{
- char *map;
- int ret = 0, unmapret;
- const uint8_t *magic;
- uint64_t mmap_length;
- uint16_t major, minor;
- uint8_t word_size;
- const struct crash_abi_unknown *abi;
- uint16_t endian;
- enum lttng_crash_type layout_type;
-
- map = mmap(NULL, RB_CRASH_DUMP_ABI_LEN, PROT_READ, MAP_PRIVATE,
- fd, 0);
- if (map == MAP_FAILED) {
- PERROR("Mapping file");
- return -1;
- }
- abi = (const struct crash_abi_unknown *) map;
- magic = crash_get_hdr_raw_field(layout, abi, magic);
- print_dbg_magic(magic);
- if (check_magic(magic)) {
- DBG("Unknown magic number");
- ret = 1; /* positive return value, skip */
- goto end;
- }
- endian = crash_get_hdr_field(layout, abi, endian);
- switch (endian) {
- case RB_CRASH_ENDIAN:
- break;
- case RB_CRASH_ENDIAN_REVERSE:
- layout->reverse_byte_order = 1;
- break;
- default:
- DBG("Unknown endianness value: 0x%X", (unsigned int) endian);
- ret = 1; /* positive return value, skip */
- goto end;
- }
- layout_type = (enum lttng_crash_type) crash_get_hdr_field(layout, abi, layout_type);
- switch (layout_type) {
- case LTTNG_CRASH_TYPE_UST:
- break;
- case LTTNG_CRASH_TYPE_KERNEL:
- ERR("lttng-modules buffer layout support not implemented");
- ret = 1; /* positive return value, skip */
- goto end;
- default:
- ERR("Unknown layout type %u", (unsigned int) layout_type);
- ret = 1; /* positive return value, skip */
- goto end;
- }
- mmap_length = crash_get_hdr_field(layout, abi, mmap_length);
- DBG("mmap_length: %" PRIu64, mmap_length);
- layout->mmap_length = mmap_length;
- major = crash_get_hdr_field(layout, abi, major);
- DBG("major: %u", major);
- minor = crash_get_hdr_field(layout, abi, minor);
- DBG("minor: %u", minor);
- word_size = crash_get_hdr_field(layout, abi, word_size);
- DBG("word_size: %u", word_size);
- switch (major) {
- case 0:
- switch (minor) {
- case 0:
- ret = get_crash_layout_0_0(layout, map);
- if (ret)
- goto end;
- break;
- default:
- ret = -1;
- ERR("Unsupported crash ABI %u.%u\n", major, minor);
- goto end;
- }
- break;
- default:
- ERR("Unsupported crash ABI %u.%u\n", major, minor);
- ret = -1;
- goto end;
- }
- layout->word_size = word_size;
-end:
- unmapret = munmap(map, RB_CRASH_DUMP_ABI_LEN);
- if (unmapret) {
- PERROR("munmap");
- }
- return ret;
-}
-
-/* buf_trunc mask selects only the buffer number. */
-static inline
-uint64_t buf_trunc(uint64_t offset, uint64_t buf_size)
-{
- return offset & ~(buf_size - 1);
-}
-
-/* subbuf_trunc mask selects the subbuffer number. */
-static inline
-uint64_t subbuf_trunc(uint64_t offset, uint64_t subbuf_size)
-{
- return offset & ~(subbuf_size - 1);
-}
-
-/* buf_offset mask selects only the offset within the current buffer. */
-static inline
-uint64_t buf_offset(uint64_t offset, uint64_t buf_size)
-{
- return offset & (buf_size - 1);
-}
-
-/* subbuf_offset mask selects the offset within the current subbuffer. */
-static inline
-uint64_t subbuf_offset(uint64_t offset, uint64_t subbuf_size)
-{
- return offset & (subbuf_size - 1);
-}
-
-/* subbuf_index returns the index of the current subbuffer within the buffer. */
-static inline
-uint64_t subbuf_index(uint64_t offset, uint64_t buf_size, uint64_t subbuf_size)
-{
- return buf_offset(offset, buf_size) / subbuf_size;
-}
-
-static inline
-uint64_t subbuffer_id_get_index(uint32_t mode, uint64_t id,
- unsigned int wl)
-{
- if (mode == RING_BUFFER_OVERWRITE)
- return id & SB_ID_INDEX_MASK(wl);
- else
- return id;
-}
-
-static
-int copy_crash_subbuf(const struct lttng_crash_layout *layout,
- int fd_dest, char *buf, uint64_t offset)
-{
- uint64_t buf_size, subbuf_size, num_subbuf, sbidx, id,
- sb_bindex, rpages_offset, p_offset, seq_cc,
- committed, commit_count_mask, consumed_cur,
- packet_size;
- char *subbuf_ptr;
- ssize_t writelen;
-
- /*
- * Get the current subbuffer by applying the proper mask to
- * "offset", and looking up the subbuf location within the
- * source file buf.
- */
-
- buf_size = layout->buf_size;
- subbuf_size = layout->subbuf_size;
- num_subbuf = layout->num_subbuf;
-
- switch (layout->word_size) {
- case 4: commit_count_mask = 0xFFFFFFFFULL / num_subbuf;
- break;
- case 8: commit_count_mask = 0xFFFFFFFFFFFFFFFFULL / num_subbuf;
- break;
- default:
- ERR("Unsupported word size: %u",
- (unsigned int) layout->word_size);
- return -EINVAL;
- }
-
- DBG("Copy crash subbuffer at offset %" PRIu64, offset);
- sbidx = subbuf_index(offset, buf_size, subbuf_size);
-
- /*
- * Find where the seq cc is located. Compute length of data to
- * copy.
- */
- seq_cc = crash_get_array_field(layout, buf, commit_hot_array,
- sbidx, commit_hot_seq);
- consumed_cur = crash_get_field(layout, buf, consumed_offset);
-
- /*
- * Check that the buffer we are getting is after or at
- * consumed_cur position.
- */
- if ((long) subbuf_trunc(offset, subbuf_size)
- - (long) subbuf_trunc(consumed_cur, subbuf_size) < 0) {
- DBG("No data: position is before consumed_cur");
- goto nodata;
- }
-
- /*
- * Check if subbuffer has been fully committed.
- */
- if (((seq_cc - subbuf_size) & commit_count_mask)
- - (buf_trunc(offset, buf_size) / num_subbuf)
- == 0) {
- committed = subbuf_size;
- } else {
- committed = subbuf_offset(seq_cc, subbuf_size);
- if (!committed) {
- DBG("No data committed, seq_cc: %" PRIu64, seq_cc);
- goto nodata;
- }
- }
-
- /* Find actual physical offset in subbuffer table */
- id = crash_get_array_field(layout, buf, buf_wsb_array,
- sbidx, buf_wsb_id);
- sb_bindex = subbuffer_id_get_index(layout->mode, id,
- layout->word_size);
- rpages_offset = crash_get_array_field(layout, buf, sb_array,
- sb_bindex, sb_array_shmp_offset);
- p_offset = crash_get_field(layout, buf + rpages_offset,
- sb_backend_p_offset);
- subbuf_ptr = buf + p_offset;
-
- if (committed == subbuf_size) {
- /*
- * Packet header can be used.
- */
- if (layout->length.packet_size) {
- memcpy(&packet_size,
- subbuf_ptr + layout->offset.packet_size,
- layout->length.packet_size);
- if (layout->reverse_byte_order) {
- packet_size = __bswap_64(packet_size);
- }
- packet_size /= CHAR_BIT;
- } else {
- packet_size = subbuf_size;
- }
- } else {
- uint64_t patch_size;
-
- /*
- * Find where to patch the sub-buffer header with actual
- * readable data len and packet len, derived from seq
- * cc. Patch it in our in-memory copy.
- */
- patch_size = committed * CHAR_BIT;
- if (layout->reverse_byte_order) {
- patch_size = __bswap_64(patch_size);
- }
- if (layout->length.content_size) {
- memcpy(subbuf_ptr + layout->offset.content_size,
- &patch_size, layout->length.content_size);
- }
- if (layout->length.packet_size) {
- memcpy(subbuf_ptr + layout->offset.packet_size,
- &patch_size, layout->length.packet_size);
- }
- packet_size = committed;
- }
-
- /*
- * Copy packet into fd_dest.
- */
- writelen = lttng_write(fd_dest, subbuf_ptr, packet_size);
- if (writelen < packet_size) {
- PERROR("Error writing to output file");
- return -1;
- }
- DBG("Copied %" PRIu64 " bytes of data", packet_size);
- return 0;
-
-nodata:
- return -ENODATA;
-}
-
-static
-int copy_crash_data(const struct lttng_crash_layout *layout, int fd_dest,
- int fd_src)
-{
- char *buf;
- int ret = 0, has_data = 0;
- struct stat statbuf;
- size_t src_file_len;
- uint64_t prod_offset, consumed_offset;
- uint64_t offset, subbuf_size;
- ssize_t readlen;
-
- ret = fstat(fd_src, &statbuf);
- if (ret) {
- return ret;
- }
- src_file_len = layout->mmap_length;
- buf = zmalloc(src_file_len);
- if (!buf) {
- return -1;
- }
- readlen = lttng_read(fd_src, buf, src_file_len);
- if (readlen < 0) {
- PERROR("Error reading input file");
- ret = -1;
- goto end;
- }
-
- prod_offset = crash_get_field(layout, buf, prod_offset);
- DBG("prod_offset: 0x%" PRIx64, prod_offset);
- consumed_offset = crash_get_field(layout, buf, consumed_offset);
- DBG("consumed_offset: 0x%" PRIx64, consumed_offset);
- subbuf_size = layout->subbuf_size;
-
- for (offset = consumed_offset; offset < prod_offset;
- offset += subbuf_size) {
- ret = copy_crash_subbuf(layout, fd_dest, buf, offset);
- if (!ret) {
- has_data = 1;
- }
- if (ret) {
- goto end;
- }
- }
-end:
- free(buf);
- if (ret && ret != -ENODATA) {
- return ret;
- }
- if (has_data) {
- return 0;
- } else {
- return -ENODATA;
- }
-}
-
-static
-int extract_file(int output_dir_fd, const char *output_file,
- int input_dir_fd, const char *input_file)
-{
- int fd_dest, fd_src, ret = 0, closeret;
- struct lttng_crash_layout layout;
-
- layout.reverse_byte_order = 0; /* For reading magic number */
-
- DBG("Extract file '%s'", input_file);
- fd_src = openat(input_dir_fd, input_file, O_RDONLY);
- if (fd_src < 0) {
- PERROR("Error opening '%s' for reading",
- input_file);
- ret = -1;
- goto end;
- }
-
- /* Query the crash ABI layout */
- ret = get_crash_layout(&layout, fd_src);
- if (ret) {
- goto close_src;
- }
-
- fd_dest = openat(output_dir_fd, output_file,
- O_RDWR | O_CREAT | O_EXCL,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (fd_dest < 0) {
- PERROR("Error opening '%s' for writing",
- output_file);
- ret = -1;
- goto close_src;
- }
-
- ret = copy_crash_data(&layout, fd_dest, fd_src);
- if (ret) {
- goto close_dest;
- }
-
-close_dest:
- closeret = close(fd_dest);
- if (closeret) {
- PERROR("close");
- }
- if (ret == -ENODATA) {
- closeret = unlinkat(output_dir_fd, output_file, 0);
- if (closeret) {
- PERROR("unlinkat");
- }
- }
-close_src:
- closeret = close(fd_src);
- if (closeret) {
- PERROR("close");
- }
-end:
- return ret;
-}
-
-static
-int extract_all_files(const char *output_path,
- const char *input_path)
-{
- DIR *input_dir, *output_dir;
- int input_dir_fd, output_dir_fd, ret = 0, closeret;
- struct dirent *entry; /* input */
-
- /* Open input directory */
- input_dir = opendir(input_path);
- if (!input_dir) {
- PERROR("Cannot open '%s' path", input_path);
- return -1;
- }
- input_dir_fd = dirfd(input_dir);
- if (input_dir_fd < 0) {
- PERROR("dirfd");
- return -1;
- }
-
- /* Open output directory */
- output_dir = opendir(output_path);
- if (!output_dir) {
- PERROR("Cannot open '%s' path", output_path);
- return -1;
- }
- output_dir_fd = dirfd(output_dir);
- if (output_dir_fd < 0) {
- PERROR("dirfd");
- return -1;
- }
-
- while ((entry = readdir(input_dir))) {
- if (!strcmp(entry->d_name, ".")
- || !strcmp(entry->d_name, ".."))
- continue;
- ret = extract_file(output_dir_fd, entry->d_name,
- input_dir_fd, entry->d_name);
- if (ret == -ENODATA) {
- DBG("No data in file '%s', skipping", entry->d_name);
- ret = 0;
- continue;
- } else if (ret < 0) {
- break;
- } else if (ret > 0) {
- DBG("Skipping file '%s'", entry->d_name);
- ret = 0;
- continue;
- }
- }
- closeret = closedir(output_dir);
- if (closeret) {
- PERROR("closedir");
- }
- closeret = closedir(input_dir);
- if (closeret) {
- PERROR("closedir");
- }
- return ret;
-}
-
-static
-int extract_one_trace(const char *output_path,
- const char *input_path)
-{
- char dest[PATH_MAX], src[PATH_MAX];
- int ret;
-
- DBG("Extract crash trace '%s' into '%s'", input_path, output_path);
-
- /* Copy metadata */
- strncpy(dest, output_path, PATH_MAX);
- dest[PATH_MAX - 1] = '\0';
- strncat(dest, "/metadata", PATH_MAX - strlen(dest) - 1);
-
- strncpy(src, input_path, PATH_MAX);
- src[PATH_MAX - 1] = '\0';
- strncat(src, "/metadata", PATH_MAX - strlen(dest) - 1);
-
- ret = copy_file(dest, src);
- if (ret) {
- return ret;
- }
-
- /* Extract each other file that has expected header */
- return extract_all_files(output_path, input_path);
-}
-
-static
-int extract_trace_recursive(const char *output_path,
- const char *input_path)
-{
- DIR *dir;
- int dir_fd, ret = 0, closeret;
- struct dirent *entry;
- int has_warning = 0;
-
- /* Open directory */
- dir = opendir(input_path);
- if (!dir) {
- PERROR("Cannot open '%s' path", input_path);
- return -1;
- }
- dir_fd = dirfd(dir);
- if (dir_fd < 0) {
- PERROR("dirfd");
- return -1;
- }
-
- while ((entry = readdir(dir))) {
- if (!strcmp(entry->d_name, ".")
- || !strcmp(entry->d_name, "..")) {
- continue;
- }
- switch (entry->d_type) {
- case DT_DIR:
- {
- char output_subpath[PATH_MAX];
- char input_subpath[PATH_MAX];
-
- strncpy(output_subpath, output_path,
- sizeof(output_subpath));
- output_subpath[sizeof(output_subpath) - 1] = '\0';
- strncat(output_subpath, "/",
- sizeof(output_subpath) - strlen(output_subpath) - 1);
- strncat(output_subpath, entry->d_name,
- sizeof(output_subpath) - strlen(output_subpath) - 1);
-
- ret = mkdir(output_subpath, S_IRWXU | S_IRWXG);
- if (ret) {
- PERROR("mkdir");
- has_warning = 1;
- goto end;
- }
-
- strncpy(input_subpath, input_path,
- sizeof(input_subpath));
- input_subpath[sizeof(input_subpath) - 1] = '\0';
- strncat(input_subpath, "/",
- sizeof(input_subpath) - strlen(input_subpath) - 1);
- strncat(input_subpath, entry->d_name,
- sizeof(input_subpath) - strlen(input_subpath) - 1);
-
- ret = extract_trace_recursive(output_subpath,
- input_subpath);
- if (ret) {
- has_warning = 1;
- }
- break;
- }
- case DT_REG:
- case DT_LNK:
- if (!strcmp(entry->d_name, "metadata")) {
- ret = extract_one_trace(output_path,
- input_path);
- if (ret) {
- WARN("Error extracting trace '%s', continuing anyway.",
- input_path);
- has_warning = 1;
- }
- }
- /* Ignore other files */
- break;
- default:
- has_warning = 1;
- goto end;
- }
- }
-end:
- closeret = closedir(dir);
- if (closeret) {
- PERROR("closedir");
- }
- return has_warning;
-}
-
-static
-int delete_dir_recursive(const char *path)
-{
- DIR *dir;
- int dir_fd, ret = 0, closeret;
- struct dirent *entry;
-
- /* Open trace directory */
- dir = opendir(path);
- if (!dir) {
- PERROR("Cannot open '%s' path", path);
- ret = -errno;
- goto end;
- }
- dir_fd = dirfd(dir);
- if (dir_fd < 0) {
- PERROR("dirfd");
- ret = -errno;
- goto end;
- }
-
- while ((entry = readdir(dir))) {
- if (!strcmp(entry->d_name, ".")
- || !strcmp(entry->d_name, "..")) {
- continue;
- }
- switch (entry->d_type) {
- case DT_DIR:
- {
- char *subpath = zmalloc(PATH_MAX);
-
- if (!subpath) {
- PERROR("zmalloc path");
- ret = -1;
- goto end;
- }
- strncpy(subpath, path, PATH_MAX);
- subpath[PATH_MAX - 1] = '\0';
- strncat(subpath, "/",
- PATH_MAX - strlen(subpath) - 1);
- strncat(subpath, entry->d_name,
- PATH_MAX - strlen(subpath) - 1);
-
- ret = delete_dir_recursive(subpath);
- free(subpath);
- if (ret) {
- /* Error occured, abort traversal. */
- goto end;
- }
- break;
- }
- case DT_REG:
- ret = unlinkat(dir_fd, entry->d_name, 0);
- if (ret) {
- PERROR("Unlinking '%s'", entry->d_name);
- goto end;
- }
- break;
- default:
- ret = -EINVAL;
- goto end;
- }
- }
-end:
- if (!ret) {
- ret = rmdir(path);
- if (ret) {
- PERROR("rmdir '%s'", path);
- }
- }
- closeret = closedir(dir);
- if (closeret) {
- PERROR("closedir");
- }
- return ret;
-}
-
-static
-int view_trace(const char *viewer_path, const char *trace_path)
-{
- pid_t pid;
-
- pid = fork();
- if (pid < 0) {
- /* Error */
- PERROR("fork");
- return -1;
- } else if (pid > 0) {
- /* Parent */
- int status;
-
- pid = waitpid(pid, &status, 0);
- if (pid < 0 || !WIFEXITED(status)) {
- return -1;
- }
- } else {
- /* Child */
- int ret;
-
- ret = execlp(viewer_path, viewer_path,
- trace_path, (char *) NULL);
- if (ret) {
- PERROR("execlp");
- exit(EXIT_FAILURE);
- }
- exit(EXIT_SUCCESS); /* Never reached */
- }
- return 0;
-}
-
-/*
- * main
- */
-int main(int argc, char *argv[])
-{
- int ret;
- bool has_warning = false;
- const char *output_path = NULL;
- char tmppath[] = "/tmp/lttng-crash-XXXXXX";
-
- progname = argv[0] ? argv[0] : "lttng-crash";
-
- ret = parse_args(argc, argv);
- if (ret > 0) {
- goto end;
- } else if (ret < 0) {
- has_warning = true;
- goto end;
- }
-
- if (opt_output_path) {
- output_path = opt_output_path;
- ret = mkdir(output_path, S_IRWXU | S_IRWXG);
- if (ret) {
- PERROR("mkdir");
- has_warning = true;
- goto end;
- }
- } else {
- output_path = mkdtemp(tmppath);
- if (!output_path) {
- PERROR("mkdtemp");
- has_warning = true;
- goto end;
- }
- }
-
- ret = extract_trace_recursive(output_path, input_path);
- if (ret < 0) {
- has_warning = true;
- goto end;
- } else if (ret > 0) {
- /* extract_trace_recursive reported a warning. */
- has_warning = true;
- }
- if (!opt_output_path) {
- /* View trace */
- ret = view_trace(opt_viewer_path, output_path);
- if (ret) {
- has_warning = true;
- }
- /* unlink temporary trace */
- ret = delete_dir_recursive(output_path);
- if (ret) {
- has_warning = true;
- }
- }
-end:
- exit(has_warning ? EXIT_FAILURE : EXIT_SUCCESS);
-}
projects / lttng-tools.git / blobdiff