Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!gatech!galbp!fafhrd.LBP.HARRIS.COM!bryan
From: bryan@fafhrd.LBP.HARRIS.COM (Bryan Ivey (FAFHRD System Adminstrator))
Newsgroups: comp.os.minix
Subject: Re: /usr/minix/amoeba/examples/client3.c
Message-ID: <7501@galbp.LBP.HARRIS.COM>
Date: 22 Mar 89 17:33:31 GMT
References: <11077@louie.udel.EDU> <27232@cci632.UUCP>
Sender: news@galbp.LBP.HARRIS.COM
Reply-To: bryan@fafhrd.LBP.HARRIS.COM (Bryan Ivey (FAFHRD System Adminstrator))
Organization: Lanier/Harris, Atlanta, GA
Lines: 37


In article <27232@cci632.UUCP> tvf@ccird7.UUCP (Tom Frauenhofer) writes:
>In article <11077@louie.udel.EDU> jnall%FSU.BITNET@cunyvm.cuny.edu (John Nall 904-644-5241) writes:
>>client3.c, does not work because the main routine has a read statement
>>which is of the form  "if ((n=read(fd,buf,bytes) < 0))" and, as stated
>>on page 15 of K&R, this always sets n to 0 or 1, rather than the number
>>of bytes read.
>
>
>The code is correct.  If there is an error with the read, it returns -1.
>Check page 160, K&R, section 8.2 (Low Level I/O - Read and Write), the second
>paragraph (the one that begins "Each call returns..." - the paragraph after
>the sample code).
>
>Thomas V. Frauenhofer	...!rutgers!rochester!cci632!ccird7!tvf


John Nall is making a reference to the levels of parenthesis, i.e.,

           +--------------------------+
           |+------------------------+|
           ||      +------------+    ||
           ||      |            |    ||
        if ((n=read(fd,buf,bytes) < 0))
	
should be

           +--------------------------+
           |+--------------------+    |
           ||      +------------+|    |
           ||      |            ||    |
        if ((n=read(fd,buf,bytes)) < 0)
	

Bryan Ivey				Harris / Lanier Computer R & D
Senior Systems Analyst			2310 Parklake Drive
bryan@fafhrd.LBP.HARRIS.COM		Atlanta, GA  30345