Embed Notice

HTML Code

<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/slink/statuses/113980497879922801">Nils Goroll 🕊️:varnishcache: (slink@fosstodon.org)'s status on Tuesday, 11-Feb-2025 12:06:43 JST</a><a href="https://fosstodon.org/@slink" title="slink@fosstodon.org"><img src="https://gnusocial.jp/avatar/226665-48-20231227110103.webp" width="48" height="48" alt="Nils Goroll 🕊️:varnishcache:" style="position: absolute; left: 0; top: 0;">Nils Goroll 🕊️:varnishcache:</a></section><article><p><a href="https://fosstodon.org/tags/TIL" rel="tag">#TIL</a>: <a href="https://fosstodon.org/tags/gdb" rel="tag">#gdb</a> "ptype /o" reports holes in structures (missed packing opportunities) <a href="https://fosstodon.org/tags/c" rel="tag">#c</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4544659#notice-8897466">In conversation</a><time datetime="2025-02-11T12:06:43+09:00" title="Tuesday, 11-Feb-2025 12:06:43 JST">about 12 days ago</time> <span>from <span><a href="https://fosstodon.org/@slink/113980497879922801" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@slink/113980497879922801">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/4116772">(gdb) ptype /o struct req
/* offset      |    size */  type = struct req {
/*      0      |       4 */    unsigned int magic;
/* XXX  4-byte hole      */
/*      8      |       8 */    body_status_t req_body_status;
/*     16      |       8 */    stream_close_t doclose;
/*     24      |       4 */    unsigned int restarts;
/*     28      |       4 */    unsigned int max_restarts;
/*     32      |       4 */    unsigned int esi_level;
/* XXX  4-byte hole      */
/*     40      |       8 */    const struct req_step *req_step;</a></label><br><a href="https://cdn.fosstodon.org/media_attachments/files/113/980/495/729/997/960/original/a6218d3382034bce.png" rel="external">https://cdn.fosstodon.org/media_attachments/files/113/980/495/729/997/960/original/a6218d3382034bce.png</a></li></ol></footer></blockquote>

Corresponding Notice

Embed this notice
Nils Goroll 🕊️:varnishcache: (slink@fosstodon.org)'s status on Tuesday, 11-Feb-2025 12:06:43 JST Nils Goroll 🕊️:varnishcache:
#TIL: #gdb "ptype /o" reports holes in structures (missed packing opportunities) #c
In conversationabout 12 days ago from fosstodon.orgpermalink
Attachments
1. (gdb) ptype /o struct req /* offset | size */ type = struct req { /* 0 | 4 */ unsigned int magic; /* XXX 4-byte hole */ /* 8 | 8 */ body_status_t req_body_status; /* 16 | 8 */ stream_close_t doclose; /* 24 | 4 */ unsigned int restarts; /* 28 | 4 */ unsigned int max_restarts; /* 32 | 4 */ unsigned int esi_level; /* XXX 4-byte hole */ /* 40 | 8 */ const struct req_step *req_step;
  https://cdn.fosstodon.org/media_attachments/files/113/980/495/729/997/960/original/a6218d3382034bce.png

Public

Embed Notice

HTML Code

Corresponding Notice