On Oct 27 23:30, Vermessung AVT - Wolfgang Rieger wrote: > From: Corinna Vinschen [mailto:corinna-cyg...@cygwin.com] > Sent: Tuesday, October 27, 2015 10:53 > To: cygwin@cygwin.com > Subject: Re: gawk: Bad File Descriptor error with concurrent readonly access > to a network file > (Snip) > > Cygwin uses full sharing for all files it opens, unless the file is opened > > in very specific circumstances (e.g, creating a symlink, > > deleting a file). "Bad file descriptor" doesn't point to a sharing problem. > > It seems the handle is unusable or something. > > > > I tried your testcase and I can't reproduce the problem in my environment. > > Have you tried catching a trace of the problem via strace? > > It would be helpful to see where the EBADF occurs. > > Here is the portion of strace output where IMHO the error occurs. The > behaviour is quite different when running with strace, so I hope it is the > same error situation, but at least the message given is "Bad file descriptor". > I changed the paths to ???. This is strace --mask=syscall. If you need > further info I would appreciate to send it directly to you since there is a > lot of info in strace I do not want to put into the www: > > 197 70416 [main] gawk 3844 open: 3 = open(???\datafile.txt, 0x8000) > 327 70743 [main] gawk 3844 fcntl64: 0 = fcntl(3, 1, 0x0) > 265 71008 [main] gawk 3844 fcntl64: 0 = fcntl(3, 2, 0x1) > 3298 74306 [main] gawk 3844 fhandler_base::fstat_helper: 0 = fstat > (\??\???\datafile.txt, 0x8004AEF8) st_size=135, st_mode=0100644, > st_ino=281474976912276st_atim=551A9D6D.BD48F54 st_ctim=5603C3F5.26F49798 > st_mtim=54E1ECAE.B2A66C8 st_birthtim=551A9D6D.BD48F54 > 206 74512 [main] gawk 3844 fstat64: 0 = fstat(3, 0x8004AEF8) > 216 74728 [main] gawk 3844 isatty: 0 = isatty(3) > 1887 76615 [main] gawk 3844 fhandler_base::fstat_helper: 0 = fstat > (\??\???\datafile.txt, 0x8004AEF8) st_size=135, st_mode=0100644, > st_ino=281474976912276st_atim=551A9D6D.BD48F54 st_ctim=5603C3F5.26F49798 > st_mtim=54E1ECAE.B2A66C8 st_birthtim=551A9D6D.BD48F54 > 241 76856 [main] gawk 3844 fstat64: 0 = fstat(3, 0x8004AEF8) > 304 77160 [main] gawk 3844 read: read(3, 0x8004AF90, 135) blocking > 1722 78882 [main] gawk 3844 seterrno_from_nt_status: > /home/corinna/src/cygwin/cygwin-1.7.33/cygwin-1.7.33-1.i686/src/src/winsup/cygwin/fhandler.cc:276 > status 0xC0000128 -> windows error 6
0xC0000128 is STATUS_FILE_CLOSED. "Something" closed the handle. This is only the result, unfortunately. It doesn't tell us anything in terms of the cause. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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