<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - Misuse of setjmp in DCTStream" href="https://bugs.freedesktop.org/show_bug.cgi?id=63067#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - Misuse of setjmp in DCTStream" href="https://bugs.freedesktop.org/show_bug.cgi?id=63067">bug 63067</a> from <a class="email" href="mailto:rodrigorivascosta@gmail.com" title="rodrigo <rodrigorivascosta@gmail.com>"> rodrigo</a> <pre>(In reply to <a href="show_bug.cgi?id=63067#c1">comment #1</a>) > The man page I have here does not say that, do you have a link to the POSIX > or C spec at hand? You can read what POSIX says at [0]. The C99 specification is at [1] (section 7.3.1.1) but the wording is almost identical, as this function is 'ISO C aligned'. Also, many linux distributions have a package named manpages-posix or the like. If you have it installed you can request the POSIX version of the man page by running: $ man 3p setjmp But now that I read the 'longjmp(3p)' [2] with more detail, I think that there are bigger problems ahead... Note the following quote: > if [when calling longjmp] the function containing the invocation of setjmp() has terminated execution [...] the behavior is undefined. And I think that this happens a lot, as `setjmp` is called from a lot of helper functions. I think that the right thing to do should be to call it only once at the beginning of the main decompression function. The problem is that such a call cannot be encapsulated into the DCTStream class, it had to be done from the user code, and that is not very nice. [0]: <a href="http://pubs.opengroup.org/onlinepubs/009696799/functions/setjmp.html">http://pubs.opengroup.org/onlinepubs/009696799/functions/setjmp.html</a> [1]: <a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf">http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf</a> [2]: <a href="http://pubs.opengroup.org/onlinepubs/009696799/functions/longjmp.html">http://pubs.opengroup.org/onlinepubs/009696799/functions/longjmp.html</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>