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* mdb or platforms with an out of date v8.so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