Date: Sun, 14 Jan 2007 19:41:41 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: girish r <fmail_girish@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: semaphore.h does'nt include fcntl.h ? Message-ID: <20070115014141.GG46272@dan.emsphone.com> In-Reply-To: <628825.38045.qm@web62001.mail.re1.yahoo.com> References: <628825.38045.qm@web62001.mail.re1.yahoo.com>
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In the last episode (Jan 14), girish r said: > I am trying to use sem_open(3) but gcc complains that O_CREAT and > O_EXCL is undeclared. According to the man page only semaphore.h > needs to be included. But including fcntl.h solves the problem. Looks like a semaphore.h needs to define O_CREAT and O_EXCL (just having it include fcntl.h looks to be okay according to http://www.opengroup.org/onlinepubs/009695399/basedefs/semaphore.h.html ) > sem_t *lock = sem_open("example_lock", O_CREAT | O_EXCL, 0600, 1); > Another thing, a program with the above function call compiles but > when I execute it, it spits out "Bad system call (core dump)". > Specifically, I am trying to run this program given here: > "http://www.informit.com/articles/article.asp?p=679545&seqNum=3&rl=1". You'll need to include "options P1003_1B_SEMAPHORES" in your kernel config, or load the "sem" kernel module. -- Dan Nelson dnelson@allantgroup.com
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