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From: tim@proton.amd.com (Tim Olson)
Newsgroups: comp.os.minix
Subject: Re: source for open(2)
Message-ID: <1991May9.031628.20701@dvorak.amd.com>
Date: 9 May 91 03:16:28 GMT
References: <1991May7.140448.10727@Arco.COM>
Sender: usenet@dvorak.amd.com (Usenet News)
Reply-To: tim@amd.com (Tim Olson)
Organization: Advanced Micro Devices, Austin, TX
Lines: 21

In article <1991May7.140448.10727@Arco.COM> dprrhb@inetg1.ARCO.COM (Reginald H. Beardsley) writes:
| 
|   Where is the source for the open() system call?  I have looked through fs,
| mm, and kernel.  I found the code for DOING the work, but not the entry point.
| From the structure of Minix this should be code to send a message to fs and 
| then call the process scheduler.  It appears to be in libc.a but there is no
| code for the current implementation in /usr/src/lib just source for a POSIX.1
| compliant entry point.

If you are using version 1.5 on the IBM PC, then the sequence is:

	open()	  in lib/posix/open.c	calls
	callm1()  in lib/other/call.c,  which calls
	sendrec() in lib/ibm/sendrec.s,   which performs an
	int SYSVEC instruction.


--
	-- Tim Olson
	Advanced Micro Devices
	(tim@amd.com)