phil-news-nospam's articles:

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verifying file ownership with dlopen() 18 37 (5/5/2010 1:27:29 AM) comp.unix.programmer Is there a way I can verify file ownership of a dynamic library I will be opening with dlopen()? If the program that is opening it is running suid, especially suid root, I want to be sure the library is owned ... phil

warning: comparison is always true due to limited range of data type 6 31 (10/26/2009 6:27:19 PM) comp.lang.c I have the following expression coded in a macro: ((((__typeof__((x)))0) - ((__typeof__((x)))1)) < ((__typeof__((x)))0)) It uses GCC's extension __typeof__() but I don't think that's an issue. This expression... phil

INT_MIN/-1 7 28 (10/26/2009 11:15:15 AM) comp.lang.c Is the behavior of INT_MIN/-1 defined? 6.5.5.6 specifies a result consistency for a/b if a/b is representable. But if it is not representable (INT_MIN/-1 is such a case for int) the standard is silent. There ... phil

conversion from unsigned to signed with a value range shift 5 23 (9/21/2009 4:54:49 AM) comp.lang.c I want convert a value in a signed integer into an unsigned integer of the same size, with a linear value shift that converts the lowest signed value into the lowest unsigned value, and converts the highest sig... phil

struct timeval and struct timespec 3 65 (9/16/2009 9:27:11 AM) comp.unix.programmer Although we should never see systems producing such times, times before the standard epoch are apparently supported. This might get used by programs not specifically system oriented, but using the system funct... phil

fork() then clean up 84 40 (8/13/2009 3:30:27 AM) comp.unix.programmer I have a function that needs to run in a separate process. Both parent and child will run for a long time after fork(). At least the parent will dirty a LOT of pages over this time. My worry is that the corr... phil

linked-list entirely in macros 34 36 (7/20/2009 9:40:55 PM) comp.lang.c I have an implementation of linked lists coded entirely in macros, using GNU C extensions __typeof__() and statement expressions. The flexibility of this is that it allows creating your own node types and lin... phil

meta pre-processor 25 24 (7/20/2009 9:27:34 PM) comp.lang.c I'm starting to design a meta pre-processor for the C language. It could also be used for other languages, by C is my focus. The purpose of this pre-processor is to select sections of code from files to be in... phil

cleaning up in forked child, file mappings 2 31 (4/2/2009 6:02:47 PM) comp.unix.programmer Is it considered prudent for a forked child process to close file descriptors that it will not be using, especially if the child process will be running for a while? I would think it would be, and that's what ... phil

best way to detect if a file descriptor is open 12 58 (2/3/2009 10:51:33 PM) comp.unix.programmer What would be your vote or suggestion for the best way to detect if a file descriptor is open. I've seen a few suggested, including calls to select and poll. This one seems simplest: #define fdisopen(fd) (fc... phil

phil-news-nospam's replies:

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N Process --> (potentially) N cores 13 41 (10/9/2009 3:24:37 PM) comp.unix.programmer Hi all, I just want to know if I'm wrong or right. Multiple processes can run in different cores, although multiple threads created within the same process will run on the same core or am I wrong? Thanks, Ma... gervaz (158)

Also, I think I'm going to create comp.unix.programmer.moderated 8 27 (10/20/2009 11:20:11 PM) comp.unix.programmer so that I can filter out all the spammers. ... cdalten (976)

accessing a integer of size 4bytes in a 16bit architecture 31 27 (10/21/2009 6:43:55 AM) comp.lang.c Hi, Can you please tell me how to access a integer of size 4bytes in a 16bit architecture? Regards ... ramu.ask (96)

compile int as 64 bit on a 64 bit machine? 30 25 (10/21/2009 5:40:44 PM) comp.lang.c Hello Guys, I was wondering how to compile an int into 64bit mode in a 64 bit machine with gcc. Seems by default the int is treated as 4bytes. Thanks in advance! -Andy W. ... whereasme (25)

makefiles -- need help on string substitution and object file redirect 1 20 (10/25/2009 5:10:51 AM) comp.unix.programmer I'm posting this from home, and the make file is at work, so I don't have the actual file with me. However, I'll sumarize with some pseudocode. Suppose I have a directory structure as: dir1 dir2 dir3 Each di... no_one11 (1)

concurrent access to a socket 6 115 (10/26/2009 9:34:38 AM) comp.unix.programmer Hi Group, Is it safe to have two concurrent processes that share a socket as follow: one only read from that socket and the other only write on it? Thanks for your reply, A+ -AJ ... toto9 (37)

INT_MIN/-1 7 28 (10/26/2009 11:15:15 AM) comp.lang.c Is the behavior of INT_MIN/-1 defined? 6.5.5.6 specifies a result consistency for a/b if a/b is representable. But if it is not representable (INT_MIN/-1 is such a case for int) the standard is silent. There ... phil-news-nospam (644)

warning: comparison is always true due to limited range of data type 6 31 (10/26/2009 6:27:19 PM) comp.lang.c I have the following expression coded in a macro: ((((__typeof__((x)))0) - ((__typeof__((x)))1)) < ((__typeof__((x)))0)) It uses GCC's extension __typeof__() but I don't think that's an issue. This expression... phil-news-nospam (644)

dp 51 52 (10/26/2009 11:43:33 PM) comp.lang.c (d)aemon (p)rimer Possible alternative name for daemon helper. I emptied my killfile to collect opinions. Any known conflicts? I don't see any in a list of common UNIX utilities. -- Webmail for Dialup U... jak (362)

experienced opinions 81 47 (4/30/2010 12:27:10 AM) comp.unix.programmer I would like to know from those out there which they have used most easily for internet sockets; select() or poll() ? From what I've been reading from this page http://beej.us/guide/bgnet/output/html/sin... nospam116 (1187)