Matthias wrote "Paul, I don't see any suggested code in the other report. please repeat it here."
Well ... I'm not sure how you missed it, since the bulk of the opening post of Bug #1014487 consists of this suggested CODE :). Here it is again, copied and pasted from Bug #1014487: ====================== Begin CODE and comments ====================== Looking about the web, I see that virtualbox is apparently trying to open /proc/self/auxv in order to determine some system capabilities, and that it is realized that this is not a reliable method -- auxv may or may not be readable. In my situation, auxv is reliably NOT readable . The following shell command reliably shows the contents of what is, I suspect, the desired auxv information: [CODE]LD_SHOW_AUXV=1 /bin/true[/CODE] For example on my Kubuntu 12.04 amd64 system, it shows: [CODE] AT_SYSINFO_EHDR: 0x7fffcd7c4000 AT_HWCAP: bfebfbff AT_PAGESZ: 4096 AT_CLKTCK: 100 AT_PHDR: 0x400040 AT_PHENT: 56 AT_PHNUM: 9 AT_BASE: 0x7ffc2640c000 AT_FLAGS: 0x0 AT_ENTRY: 0x401134 AT_UID: 1000 AT_EUID: 1000 AT_GID: 1000 AT_EGID: 1000 AT_SECURE: 0 AT_RANDOM: 0x7fffcd772489 AT_EXECFN: /bin/true AT_PLATFORM: x86_64 [/CODE] The following code might provide a useful and reliable means of parsing this auxv information: [CODE] #include <stdio.h> #include <string.h> #include <stdlib.h> /* * The following flgets() and examine_auxv() routines are Copyright * 2006 and 2012 respectively by Paul Jackson <p...@usa.net>. * * These routines are free software; you can redistribute them and/or * modify them under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You may obtain a copy of this license from: <http://www.gnu.org/licenses/>. */ /* * char *flgets(char *buf, int buflen, FILE *fp) * * Obtain one line from input file fp. Copy up to first * buflen-1 chars of line into buffer buf, discarding rest * of line. Stop reading at newline, discarding newline. * Nul terminate result and return pointer to buffer buf * on success, or NULL if nothing more to read or failure. * * Paul Jackson * p...@usa.net * 20 Feb 2006 */ static char *flgets(char *buf, int buflen, FILE * fp) { int c = -1; char *bp; bp = buf; while ((--buflen > 0) && ((c = getc(fp)) >= 0)) { if (c == '\n') goto newline; *bp++ = c; } if ((c < 0) && (bp == buf)) return NULL; if (c > 0) { while ((c = getc(fp)) >= 0) { if (c == '\n') break; } } newline: *bp++ = '\0'; return buf; } /* * int examine_auxv(const char *pattern, char *buf, int buflen) * * Examine /proc/self/auxv, as formatted in the manner * seen by running the command: * LD_SHOW_AUXV=1 /bin/true * Return the first line that has some substring matching * the input "pattern". Return up to the first (buflen-1) * characters of that line, nul-terminated, in the provided * buffer "buf". * * Only the first buflen-1 characters of each line are examined * for the input pattern. If that pattern is not entirely * contained within those buflen-1 characters, it will not * found on that line. * * Return zero if a match is found and placed in buf, else * return -1 and (in most cases - see popen(3) man page) * set errno appropriately. If no match is found, the * buffer buf is overwritten with the last line of input * from the above command. * * Paul Jackson * p...@usa.net * 17 June 2012 */ int examine_auxv(const char *pattern, char *buf, int buflen) { char *bp; FILE *fp; fp = popen("LD_SHOW_AUXV=1 /bin/true", "r"); while ((bp = flgets(buf, buflen, fp)) != NULL) { if (strstr(bp, pattern) != NULL) { pclose(fp); return 0; } } pclose(fp); return -1; } /* * Test case for above: */ #define BUFLEN 256 char buf[BUFLEN]; int main(int argc, char *argv[]) { int i; for (i = 1; i < argc; i++) { if (examine_auxv(argv[i], buf, BUFLEN) == 0) printf ("%s ==> %s\n", argv[i], buf); } exit(0); } [/CODE] ======================= End CODE and comments ======================= -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1031718 Title: Obscure error messages caused by ubuntu patch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libjpeg-turbo/+bug/1031718/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
