7 Feb
2022
7 Feb
'22
2:36 a.m.
On 2/4/2022 5:21 PM, Waldemar Brodkorb wrote:
Did you forget the preprocessor directive -D_GNU_SOURCE?
Which kernel version predates the prlimit64 syscall you are using?
best regards
Waldemar
The older kernel is 2.6.22.19. Looks like prlimit came around kernel
2.6.36.
https://man7.org/linux/man-pages/man1/prlimit.1.html
I use buildroot to compile which I think it passing all the right
things. The older kernel gives me this error while compiling uclibc-ng.
prlimit64 syscall just wasn't around before 2.6.36.
CC libc/sysdeps/linux/common/prlimit.os
In file included from ./include/sys/syscall.h:33,
from ./libc/sysdeps/linux/common/sysdep.h:19,
from ./libc/sysdeps/linux/mips/sysdep.h:24,
from libc/sysdeps/linux/common/prlimit.c:19:
libc/sysdeps/linux/common/prlimit.c: In function 'prlimit':
./libc/sysdeps/linux/mips/sysdep.h:33:33: error: '__NR_prlimit64'
undeclared (first use in this function)
33 | # define SYS_ify(syscall_name) __NR_##syscall_name
| ^~~~~
./include/bits/syscalls.h:167:11: note: in definition of macro
'internal_syscall4'
167 | : input, "r" (__a0), "r" (__a1), "r"
(__a2) \
| ^~~~~
./include/bits/syscalls.h:50:36: note: in expansion of macro 'SYS_ify'
50 | "i" (SYS_ify (name)), err, args)
| ^~~~~~~
./include/bits/syscalls.h:24:24: note: in expansion of macro
'INTERNAL_SYSCALL'
24 | long result_var = INTERNAL_SYSCALL(name, err, nr,
args); \
| ^~~~~~~~~~~~~~~~
libc/sysdeps/linux/common/prlimit.c:25:10: note: in expansion of macro
'INLINE_SYSCALL'
25 | return INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit,
| ^~~~~~~~~~~~~~
./libc/sysdeps/linux/mips/sysdep.h:33:33: note: each undeclared
identifier is reported only once for each function it appears in
33 | # define SYS_ify(syscall_name) __NR_##syscall_name
| ^~~~~
./include/bits/syscalls.h:167:11: note: in definition of macro
'internal_syscall4'
167 | : input, "r" (__a0), "r" (__a1), "r"
(__a2) \
| ^~~~~
./include/bits/syscalls.h:50:36: note: in expansion of macro 'SYS_ify'
50 | "i" (SYS_ify (name)), err, args)
| ^~~~~~~
./include/bits/syscalls.h:24:24: note: in expansion of macro
'INTERNAL_SYSCALL'
24 | long result_var = INTERNAL_SYSCALL(name, err, nr,
args); \
| ^~~~~~~~~~~~~~~~
libc/sysdeps/linux/common/prlimit.c:25:10: note: in expansion of macro
'INLINE_SYSCALL'
25 | return INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit,
| ^~~~~~~~~~~~~~
make[2]: *** [Makerules:369: libc/sysdeps/linux/common/prlimit.os] Error 1
The error with my newer (older) kernel, 2.6.36.4, was a result of my
only reverting the 2nd prlimit commit and not the 1st, so that was my error.
Lance