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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID, WEIRD_PORT autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fc89c,97188312486d4578 X-Google-Attributes: gidfc89c,public X-Google-Thread: 109fba,baaf5f793d03d420 X-Google-Attributes: gid109fba,public X-Google-Thread: 103376,97188312486d4578 X-Google-Attributes: gid103376,public X-Google-Thread: 1014db,6154de2e240de72a X-Google-Attributes: gid1014db,public From: tanmoy@qcd.lanl.gov (Tanmoy Bhattacharya) Subject: Re: What's the best language to start with? [was: Re: Should I learn C or Pascal?] Date: 1996/08/31 Message-ID: #1/1 X-Deja-AN: 177585608 references: <31FBC584.4188@ivic.qc.ca> <4vroh3$17f@goanna.cs.rmit.edu.au> content-type: text/plain organization: Los Alamos National Laboratory mime-version: 1.0 newsgroups: comp.lang.c,comp.lang.c++,comp.unix.programmer,comp.lang.ada Date: 1996-08-31T00:00:00+00:00 List-Id: In article <506v0c$ne8@solutions.solon.com> seebs@solutions.solon.com (Peter Seebach) writes: PS: There's a possible weakness. Assume sig_atomic_t is an int. Assume we PS: have an array of sig_atomic_t somewhere. Assume we decide to, as we PS: are permitted by the standard, treat it as an array of characters. The PS: first sig_atomic_t in the array may be overwritten by a signal handler PS: we have installed. We make sure the 2nd s_a_t in the array PS: contains at least PS: one null byte, so strlen((char *) sat_array) will be zero, and pass PS: the array to dupcat as both a and b. (Suitably cast to (char *).) PS: PS: It is entirely possible that, even though a and b are the same pointer, PS: that a signal handler will change the NTBS they point to between a PS: strlen(a) and a strlen(b) in the above, or between statements. PS: Not quite: Only volatile sig_atomic_t can be handled portably by a signal handler. Of course, one can cast away the volatile, but *that* is bad anyways. Cheers Tanmoy -- tanmoy@qcd.lanl.gov(128.165.23.46) DECNET: BETA::"tanmoy@lanl.gov"(1.218=1242) Tanmoy Bhattacharya O:T-8(MS B285)LANL,NM87545 H:#9,3000,Trinity Drive,NM87544 Others see , or. -- fax: 1 (505) 665 3003 voice: 1 (505) 665 4733 [ Home: 1 (505) 662 5596 ]