On Sun, Sep 6, 2020 at 12:07 PM Eliot Moss <m...@cs.umass.edu> wrote: > > On 9/6/2020 2:43 PM, David Dyck via Cygwin wrote: > > This command triggers an assertion failure > > "ag" is from the_silver_searcher > > > > $ ag 2 <(echo 2) > > assertion "p >= path" failed: file > > "/home/corinna/src/cygwin/cygwin-3.1.7/cygwin-3.1.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc", > > line 3065, function: int symlink_info::check(char*, const > > suffix_info*, fs_info&, path_conv_handle&)
> > I just tried this: > > grep 2 <(echo 2) > > on cygwin 3.1.7 and it worked fine. I am not familiar with Silver Searcher, but it would > seem that the problem is more idiosyncratic to that program than to Cygwin more generally. > I am _not_ saying the problem is not in Cygwin - only that ag must be doing something > somewhat different from what grep does with <( ) command input. Perhaps ag is testing > what sort of "thing" (device, etc.) the input file is, while grep does not - something > like that might give different behavior. > > Now I have CYGWIN=winsymlinks:native, which may (almost certainly does) affect what > path.cc is doing (the error message is concerned about symlinks; presumably Cygwin > is trying to check whether /dev/fd/63 is a symlink. > > Well, those are the clues I can offer :-) ... EM Thanks, I tried export CYGWIN=winsymlinks:native and it still asserted I think the "ag" uses mmap and pthreads - at least that is what the manual page indicated - though even when I passed --nommap I still got the assertion, >From man ag: > How is it so fast? > * Searching for literals (no regex) uses Boyer-Moore-Horspool strstr. > * Files are mmap()ed instead of read into a buffer. > * If you're building with PCRE 8.21 or greater, regex searches use the JIT > compiler. > * Ag calls pcre_study() before executing the regex on a jillion files. > * Instead of calling fnmatch() on every pattern in your ignore files, > non-regex patterns are loaded into an array and binary searched. > * Ag uses Pthreads to take advantage of multiple CPU cores and search > files in parallel. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
