Administrace komentářů

$ nm terminal.o |grep using_xterm 00000e90 T using_xterm

Překládané to asi je, žádný #ifdef se toho asi netýká.

"valgrind --leak-check=yes --log-file=v /usr/bin/dosemu.bin":

Na PC kde program fungoval funguje i teď, valgrind vytvoří asi 13kB log, na konci jsou sice nějaká hlášení o leacích, ale asi ne příliš podstatná:

==6935== HEAP SUMMARY:
==6935==     in use at exit: 38,675 bytes in 49 blocks
==6935==   total heap usage: 1,818 allocs, 1,769 frees, 194,819 bytes allocated
==6935== 
==6935== LEAK SUMMARY:
==6935==    definitely lost: 0 bytes in 0 blocks
==6935==    indirectly lost: 0 bytes in 0 blocks
==6935==      possibly lost: 0 bytes in 0 blocks
==6935==    still reachable: 38,675 bytes in 49 blocks
==6935==         suppressed: 0 bytes in 0 blocks
==6935== Reachable blocks (those to which a pointer was found) are not shown.
==6935== To see them, rerun with: --leak-check=full --show-reachable=yes
==6935== 
==6935== For counts of detected and suppressed errors, rerun with: -v
==6935== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 18 from 8)
==6935== 
==6935== HEAP SUMMARY:
==6935==     in use at exit: 423,807 bytes in 508 blocks
==6935==   total heap usage: 4,166 allocs, 3,658 frees, 11,417,093 bytes allocated
==6935== 
==6935== 12 bytes in 1 blocks are definitely lost in loss record 34 of 131
==6935==    at 0x400677E: malloc (vg_replace_malloc.c:195)
==6935==    by 0xDF9353: XcursorTryShapeCursor (in /usr/lib/libXcursor.so.1.0.2)
==6935==    by 0x4475CAC: XCreateGlyphCursor (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4011A89: X_init (X.c:2426)
==6935==    by 0x80E5296: iodev_init (in /usr/bin/dosemu.bin)
==6935==    by 0x805E334: main (in /usr/bin/dosemu.bin)
==6935== 
==6935== 124 bytes in 1 blocks are definitely lost in loss record 90 of 131
==6935==    at 0x400677E: malloc (vg_replace_malloc.c:195)
==6935==    by 0xB98D83: ??? (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB98E3A: ??? (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB986F9: xcb_connect_to_display_with_auth_info (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB98A2C: xcb_connect (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0x44A0302: _XConnectXCB (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4487F62: XOpenDisplay (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4011203: X_init (X.c:510)
==6935==    by 0x80E5296: iodev_init (in /usr/bin/dosemu.bin)
==6935==    by 0x805E334: main (in /usr/bin/dosemu.bin)
==6935== 
==6935== 124 bytes in 1 blocks are definitely lost in loss record 91 of 131
==6935==    at 0x400677E: malloc (vg_replace_malloc.c:195)
==6935==    by 0xB98D83: ??? (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB98E3A: ??? (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB986F9: xcb_connect_to_display_with_auth_info (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0xB98A2C: xcb_connect (in /usr/lib/libxcb.so.1.1.0)
==6935==    by 0x44A0302: _XConnectXCB (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4487F62: XOpenDisplay (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4015895: X11_DetectLayout (X_keymaps.c:73)
==6935==    by 0x813127E: setup_default_keytable (in /usr/bin/dosemu.bin)
==6935==    by 0x812F63B: keyb_server_init (in /usr/bin/dosemu.bin)
==6935==    by 0x81326BA: keyb_init (in /usr/bin/dosemu.bin)
==6935==    by 0x80E5296: iodev_init (in /usr/bin/dosemu.bin)
==6935== 
==6935== 2,000 (80 direct, 1,920 indirect) bytes in 1 blocks are definitely lost in loss record 120 of 131
==6935==    at 0x400677E: malloc (vg_replace_malloc.c:195)
==6935==    by 0x4479193: ??? (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4479C97: XQueryFont (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0xDF92D8: XcursorTryShapeCursor (in /usr/lib/libXcursor.so.1.0.2)
==6935==    by 0x4475CAC: XCreateGlyphCursor (in /usr/lib/libX11.so.6.3.0)
==6935==    by 0x4011A89: X_init (X.c:2426)
==6935==    by 0x80E5296: iodev_init (in /usr/bin/dosemu.bin)
==6935==    by 0x805E334: main (in /usr/bin/dosemu.bin)
==6935== 
==6935== LEAK SUMMARY:
==6935==    definitely lost: 340 bytes in 4 blocks
==6935==    indirectly lost: 1,920 bytes in 2 blocks
==6935==      possibly lost: 0 bytes in 0 blocks
==6935==    still reachable: 421,547 bytes in 502 blocks
==6935==         suppressed: 0 bytes in 0 blocks
==6935== Reachable blocks (those to which a pointer was found) are not shown.
==6935== To see them, rerun with: --leak-check=full --show-reachable=yes
==6935== 
==6935== For counts of detected and suppressed errors, rerun with: -v
==6935== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 29 from 10)

Na PC kde hází SEGV se to chová jinak: do logu se zapíše cca 10kB, zdá se shodných jako na OK PC. A pak zřejmě někde cyklí, valgrind (na top-u se zobrazuje memcheck-x86-li(nux)) neustále spotřebovává 95-100% CPU a nic se neděje. Když po několika desítkách minut zkusím breaknout s CTRL/C, skončí to zase na SEGV a valgrin do logu dopíše asi 1600 Byte, tu část od "Process terminating with default action of signal 11":

==10135== 
==10135== HEAP SUMMARY:
==10135==     in use at exit: 38,675 bytes in 49 blocks
==10135==   total heap usage: 1,818 allocs, 1,769 frees, 185,163 bytes allocated
==10135== 
==10135== LEAK SUMMARY:
==10135==    definitely lost: 0 bytes in 0 blocks
==10135==    indirectly lost: 0 bytes in 0 blocks
==10135==      possibly lost: 0 bytes in 0 blocks
==10135==    still reachable: 38,675 bytes in 49 blocks
==10135==         suppressed: 0 bytes in 0 blocks
==10135== Reachable blocks (those to which a pointer was found) are not shown.
==10135== To see them, rerun with: --leak-check=full --show-reachable=yes
==10135== 
==10135== For counts of detected and suppressed errors, rerun with: -v
==10135== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 18 from 8)
==10135== 
==10135== Process terminating with default action of signal 11 (SIGSEGV)
==10135==  Bad permissions for mapped region at address 0x4001245
==10135==    at 0x10C630: _dl_lookup_symbol_x (dl-lookup.c:713)
==10135==    by 0x1174EF: _dl_runtime_resolve (dl-trampoline.S:37)
==10135==    by 0x1FE457: mmap (mmap.S:62)
==10135==    by 0x808E635: remove_from_io_select (dosemu_debug.h:188)
==10135==    by 0x808DAB9: ??? (mapfile.c:208)
==10135==    by 0x80E4FB9: low_mem_init (unistd.h:45)
==10135==    by 0x805E2D4: redraw_cursor (text.c:180)
==10135==    by 0x13CE15: (below main) (libc-start.c:226)
==10135== 
==10135== HEAP SUMMARY:
==10135==     in use at exit: 95,850 bytes in 492 blocks
==10135==   total heap usage: 1,938 allocs, 1,446 frees, 279,383 bytes allocated
==10135== 
==10135== LEAK SUMMARY:
==10135==    definitely lost: 0 bytes in 0 blocks
==10135==    indirectly lost: 0 bytes in 0 blocks
==10135==      possibly lost: 0 bytes in 0 blocks
==10135==    still reachable: 95,850 bytes in 492 blocks
==10135==         suppressed: 0 bytes in 0 blocks
==10135== Reachable blocks (those to which a pointer was found) are not shown.
==10135== To see them, rerun with: --leak-check=full --show-reachable=yes
==10135== 
==10135== For counts of detected and suppressed errors, rerun with: -v
==10135== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 25 from 10)

Ten kousek:

==10135==  Bad permissions for mapped region at address 0x4001245
==10135==    at 0x10C630: _dl_lookup_symbol_x (dl-lookup.c:713)
==10135==    by 0x1174EF: _dl_runtime_resolve (dl-trampoline.S:37)
==10135==    by 0x1FE457: mmap (mmap.S:62)
==10135==    by 0x808E635: remove_from_io_select (dosemu_debug.h:188)
==10135==    by 0x808DAB9: ??? (mapfile.c:208)
==10135==    by 0x80E4FB9: low_mem_init (unistd.h:45)
==10135==    by 0x805E2D4: redraw_cursor (text.c:180)
==10135==    by 0x13CE15: (below main) (libc-start.c:226)

je zajímavý, ale jak jej interpretovat?