C Fcntl F_getlk Always Return True Stack Overflow 2020
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Aug 01, 2003 · In the examples we show in this section, the third argument is always an integer, corresponding to the comment in the function prototype just shown. But when we describe record locking in Section 12.3, the third argument becomes a pointer to a. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Paolo Bonzini on 8/20/2009 2:12 AM: > Why not just implement a fcntl replacement, supporting only > F_GETFD/F_SETFD for now and maybe in the future F_DUPFD and > F_DUPFD_CLOEXEC, as you mention below? You mentioned this later in the > email, but I read about it on the list in the past too, and it can be > done as the very first.true >&3;2> /dev/null will not affect the current environment either and won't fork except in the Bourne shell. I mean that exec 1>&3 2>&-will return true for a fd open in read-only mode. – Stéphane Chazelas Jun 1 '15 at 15:52.

1 Answer.If another application tries to attain a lock on the file, the kernel will block until the original lock is gone, or return EWOULDBLOCK if the LOCK_NB option is given. This locking mechanism would allow the lock file to be used without deleting and re-creating it. Advisory locking F_GETLK, F_SETLK and F_SETLKW are used. I am writing a script to do some apt commands, but I am running into potential issues of the apt/dpkg databases being locked so my script bails. I want to check the lock files i.e. /var/lib/dpkg/lock before doing anything just like apt does when it runs its command, but I can't figure out how apt is performing the lock. The lock file is always there, and apt-get is not doing a flock on the file. I am writing a script to do some apt commands, but I am running into potential issues of the apt/dpkg databases being locked so my script bails. I want to check the lock files i.e. /var/lib/dpkg/. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Visit Stack. About Us Learn more about Stack Overflow the company. Service to keep variables in memory. Ask Question Asked 2 years, 11 months ago. Active 2 years,. the background program should return.

May 04, 2013 · Well, well. Yes, API is blocking, but: Monitor.poll should return after timeout. So if self._receive_device hangs after select - it is the bug. Especilly in case when timeout=0. Monitor.__iter__ should not use polling/selecting at all as we use only one descriptor. Blocking on recvmsg in udev is good because ctypes releases GIL during calls to library functions. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for. and just returns true or false if file is. I can't figure out how to test if its locked. It is succesfully getting opened for read/write. Its so weird. I tried fcntl from c but its always.

closed as off-topic by Gilles 'SO- stop being evil', G-Man Says 'Reinstate Monica', cuonglm, Anthon, Drav Sloan Aug 8 '15 at 10:25. This question appears to be off-topic. The users who voted to close gave this specific reason: "Questions describing a problem that can't be reproduced and seemingly went away on its own or went away when a typo was fixed are off-topic as they are unlikely to. Server program gets stuck at accept function Tag: c, multithreading, server I am working on a server application in C using PthreadsLinux.Everything works fine,.

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