Red Hat Bugzilla – Bug 427194
`__NR__llseek' undeclared
Last modified: 2008-01-02 04:27:21 EST
Description of problem: When I complied softwarce(wrttien in C language), some errors were found as following: gcc -I../../include -DSTDC -g -c gcf_disk.c -o gcf_disk.o gcf_disk.c: In function `_llseek': gcf_disk.c:409: error: `__NR__llseek' undeclared (first use in this function) gcf_disk.c:409: error: (Each undeclared identifier is reported only once gcf_disk.c:409: error: for each function it appears in.) make[1]: *** [gcf_disk.o] Error 1 How reproducible: someway this is difficult to reproduce, but I should declare that the same problem has been reported to debian Linux on Nov 2004 by someone else and I do NOT know how they fixed it. I just put some relative code here for you to analyze: #ifdef LINUX /* this is a long long! */ loff_t res, byte_request; int ret; unsigned long off_high, off_low; _syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo, loff_t *, res, uint, wh); #endif Steps to Reproduce: Actual results: Expected results: Additional info:
linux/unistd.h has been included aready!
llseek() does not make sense on a 64-bit platform. You should use the system call functions provided by glibc; in this case, either lseek64(), or just a plain lseek() (but note that on 32-bit platforms you'll need to add preprocessor macros to make off_t 64-bit).
This is what I just find: $cd /usr/include $ grep "__NR__" */*.h asm-i386/unistd.h:#define __NR__llseek 140 asm-i386/unistd.h:#define __NR__newselect 142 asm-i386/unistd.h:#define __NR__sysctl 149 asm-x86_64/unistd.h:#define __NR__sysctl 156 bits/syscall.h:#define SYS__sysctl __NR__sysctl bits/syscall.h:#define SYS__llseek __NR__llseek bits/syscall.h:#define SYS__newselect __NR__newselec So, why the __NR__llseek just not defined on x86_64 architecture, and which value I should take? Or I should just find a new method to inplase the _syscall5. Any ideas?
(In reply to comment #2) > llseek() does not make sense on a 64-bit platform. > > You should use the system call functions provided by glibc; in this case, either > lseek64(), or just a plain lseek() (but note that on 32-bit platforms you'll > need to add preprocessor macros to make off_t 64-bit). I'm sorry that I haven't seen your reply. Thank you! I'll have a try.