| /* Test program for getting symbol table from vdso module. |
| Copyright (C) 2014 Red Hat, Inc. |
| This file is part of elfutils. |
| |
| This file is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| elfutils 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| #include <assert.h> |
| #include <errno.h> |
| #include <error.h> |
| #include <inttypes.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include ELFUTILS_HEADER(dwfl) |
| |
| #ifndef __linux__ |
| int |
| main (int argc __attribute__ ((unused)), char **argv) |
| { |
| printf ("Getting the vdso is unsupported.\n"); |
| return 77; |
| } |
| #else /* __linux__ */ |
| static bool vdso_seen = false; |
| |
| static int |
| module_callback (Dwfl_Module *mod, void **userdata __attribute__((unused)), |
| const char *name, Dwarf_Addr start __attribute__((unused)), |
| void *arg __attribute__((unused))) |
| { |
| /* We can only recognize the vdso by inspecting the "magic name". */ |
| if (strncmp ("[vdso: ", name, 7) == 0) |
| { |
| int syms = dwfl_module_getsymtab (mod); |
| printf ("vdso syms: %d\n", syms); |
| if (syms < 0) |
| error (2, 0, "dwfl_module_getsymtab: %s", dwfl_errmsg (-1)); |
| vdso_seen = true; |
| |
| for (int i = 0; i < syms; i++) |
| { |
| GElf_Sym sym; |
| GElf_Addr addr; |
| const char *sname = dwfl_module_getsym_info (mod, i, &sym, &addr, |
| NULL, NULL, NULL); |
| assert (sname != NULL); |
| printf ("%d: '%s' %" PRIx64 " (%" PRIx64 ")\n", |
| i, sname, sym.st_value, addr); |
| } |
| } |
| |
| return DWARF_CB_OK; |
| } |
| |
| int |
| main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused))) |
| { |
| static char *debuginfo_path; |
| static const Dwfl_Callbacks proc_callbacks = |
| { |
| .find_debuginfo = dwfl_standard_find_debuginfo, |
| .debuginfo_path = &debuginfo_path, |
| |
| .find_elf = dwfl_linux_proc_find_elf, |
| }; |
| Dwfl *dwfl = dwfl_begin (&proc_callbacks); |
| if (dwfl == NULL) |
| error (2, 0, "dwfl_begin: %s", dwfl_errmsg (-1)); |
| |
| /* Take our parent as "arbitrary" process to inspect. */ |
| pid_t pid = getppid(); |
| |
| int result = dwfl_linux_proc_report (dwfl, pid); |
| if (result < 0) |
| error (2, 0, "dwfl_linux_proc_report: %s", dwfl_errmsg (-1)); |
| else if (result > 0) |
| error (2, result, "dwfl_linux_proc_report"); |
| |
| /* Also explicitly attach for older kernels (cannot read vdso otherwise). */ |
| result = dwfl_linux_proc_attach (dwfl, pid, false); |
| if (result < 0) |
| error (2, 0, "dwfl_linux_proc_attach: %s", dwfl_errmsg (-1)); |
| else if (result > 0) |
| error (2, result, "dwfl_linux_proc_attach"); |
| |
| if (dwfl_report_end (dwfl, NULL, NULL) != 0) |
| error (2, 0, "dwfl_report_end: %s", dwfl_errmsg (-1)); |
| |
| if (dwfl_getmodules (dwfl, module_callback, NULL, 0) != 0) |
| error (1, 0, "dwfl_getmodules: %s", dwfl_errmsg (-1)); |
| |
| return vdso_seen ? 0 : -1; |
| } |
| |
| #endif /* ! __linux__ */ |