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98 lines
2.7 KiB
98 lines
2.7 KiB
11 years ago
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/*
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* gcc -Wall -lproc -o extract_dmod extract_dmod.c
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*
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* use this tool to extract the mdb_v8.so from a core file for use with older
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* mdb or platforms with an out of date v8.so
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <strings.h>
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#include <errno.h>
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#include <libproc.h>
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#include <sys/sysmacros.h>
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const char *g_sym = "mdb_v8.so_start";
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int
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main(int argc, const char *argv[])
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{
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int ifd, ofd, perr, toread, ret;
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struct ps_prochandle *p;
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GElf_Sym sym;
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prsyminfo_t si;
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char buf[1024];
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if (argc != 3) {
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fprintf(stderr, "pdump: <infile> <outfile>\n");
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return (1);
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}
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ifd = open(argv[1], O_RDONLY);
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if (ifd < 0) {
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fprintf(stderr, "failed to open: %s: %s\n",
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argv[1], strerror(errno));
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return (1);
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}
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ofd = open(argv[2], O_RDWR | O_CREAT | O_TRUNC);
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if (ofd < 0) {
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fprintf(stderr, "failed to open: %s: %s\n",
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argv[1], strerror(errno));
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return (1);
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}
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p = Pfgrab_core(ifd, NULL, &perr);
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if (p == NULL) {
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fprintf(stderr, "failed to grab core file\n");
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return (1);
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}
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if (Pxlookup_by_name(p, NULL, "a.out", g_sym, &sym, &si) != 0) {
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fprintf(stderr, "failed to lookup symobl %s\n", g_sym);
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return (0);
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}
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while (sym.st_size > 0) {
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toread = MIN(sym.st_size, sizeof (buf));
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ret = Pread(p, buf, toread, sym.st_value);
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if (ret < 0) {
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fprintf(stderr, "failed to Pread...\n");
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return (1);
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}
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if (ret != 0)
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ret = write(ofd, buf, ret);
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if (ret < 0) {
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fprintf(stderr, "failed to write to output file %s\n",
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strerror(errno));
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}
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sym.st_size -= ret;
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sym.st_value += ret;
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}
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return (0);
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}
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