From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 109fba,df854b5838c3e14 X-Google-Attributes: gid109fba,public X-Google-Thread: 103376,df854b5838c3e14 X-Google-Attributes: gid103376,public X-Google-Thread: 10db24,fec75f150a0d78f5 X-Google-Attributes: gid10db24,public X-Google-Thread: 1014db,df854b5838c3e14 X-Google-Attributes: gid1014db,public From: seebs@solutions.solon.com (Peter Seebach) Subject: Re: ANSI C and POSIX (was Re: C/C++ knocks the crap out of Ada) Date: 1996/04/09 Message-ID: <4kfbm9$ea2@solutions.solon.com>#1/1 X-Deja-AN: 146664295 references: <4kets3$ic0@news-s01.ny.us.ibm.net> organization: Usenet Fact Police (Undercover) reply-to: seebs@solon.com newsgroups: comp.lang.ada,comp.lang.c,comp.lang.c++,comp.edu Date: 1996-04-09T00:00:00+00:00 List-Id: In article , Robert Dewar wrote: >No, that's confused. First of all, the clear specifications of most >specific systems, e.g. SunOS, GUARANTEE *not* to give a sigsegv for >the call in question. Linux may or may nt give a SIGSEGV depending >on the luck of the draw (where the buffer is in memory). I suspect what you're seeing is an obvious bug in their specs. As written, the spec on at least one system also guarantees not to give a fault for char buf; read(fd, &buf, 1000); even if there are 1000 bytes available, because the check is only specified for whether the pointer given points to a valid object. >Of course writing portable code requires careful consideration >of various possibilities, and failure to be careful certainly >results in portability problems. But it is clear that if the >spec for read had been clearer, this bug would NOT have been >present in the first place! I doubt it. I would bet that whoever wrote it did not give adequate consideration to it, and did not check the spec in any detail. -s -- Peter Seebach - seebs@solon.com - Copyright 1996 Peter Seebach. C/Unix wizard -- C/Unix questions? Send mail for help. No, really! FUCK the communications decency act. Goddamned government. [literally.] The *other* C FAQ - http://www.solon.com/~seebs/c/c-iaq.html