X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f From: Sterten AT aol DOT com Message-ID: Date: Thu, 17 Feb 2005 02:12:27 EST Subject: Re: files > 4GB There is always a solution To: djgpp AT delorie DOT com MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: 9.0 SE for Windows sub 5003 Reply-To: djgpp AT delorie DOT com OK, despite Eli's first pessimistic outlook, it seems that it is somehow possible to handle files larger than 4GB, although it is maybe not so easy, I don't know much about the details. Will we see in the not too distant future a new file which just replaces one of the files of gcc/djgpp and which will let us handle large files easily just as normal files before ? Give your predictions ! I had tried to create a file >4GB on an old HD without "NTFS" , the file won't grow larger than 4GB, but no error message is produced, so this is hard to locate the error and debug ! On NTFS-drives the file is created correctly, but I can't open it. Below is another post, which a friend sent me, maybe someone can use it to give exact advice, how to solve the 4GB-problem. --Guenter. ============================================= Hi list, I'm trying to make sure a program I'm writing works with files greater than 4GB in length. In order to do that, I'm trying to create a sparse file of this size. The program is this: #define _LARGEFILE64_SOURCE #include #include #include #include int main(int argc, char *argv[] ) { int fd=open(argv[1], O_CREAT|O_WRONLY, 0755); int res; off64_t offset; offset=1024*1024*1024*2u; offset+=offset; res=lseek64(fd, offset, SEEK_SET); res=write(fd, "Hello, world\n", 13); return 0; } When I run it, however, I get a signal when executing the "write": File size limit exceeded HOWEVER, when doing "ulimit -a": core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited File system is reiserfs 3. I have tried running it also on a partition that has more than 4GB of free space. Does reiser not support large files? Thanks, Shachar -- Shachar Shemesh ============================================= and this answer: ============================================= you need to add 'O_LARGEFILE' to the flags of 'open'. if you search for EFBIG in the sources of your file system, you'll see this instantly. ============================================= -- guy