From 95e38b378480b7935238b8b2b2712f76211f4fea Mon Sep 17 00:00:00 2001 From: Yann Sionneau Date: Thu, 14 Sep 2023 16:29:40 +0200 Subject: add support for systems without legacy setrlimit/getrlimit syscalls Those must have the recent prlimit64 syscall which exists since Linux 3.2. This patch is necessary for non-legacy architectures that wish to remove support for legacy setrlimit/getrlimit syscalls. The non-legacy arch are those who opt-out via non defining __ARCH_WANT_SET_GET_RLIMIT in their arch/xxx/include/uapi/asm/unistd.h setrlimit and getrlimit are then emulated via the new prlimit64 syscall. Signed-off-by: Yann Sionneau --- libc/sysdeps/linux/common/setrlimit.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) (limited to 'libc/sysdeps/linux/common/setrlimit.c') diff --git a/libc/sysdeps/linux/common/setrlimit.c b/libc/sysdeps/linux/common/setrlimit.c index 8f4973b72..8381afc61 100644 --- a/libc/sysdeps/linux/common/setrlimit.c +++ b/libc/sysdeps/linux/common/setrlimit.c @@ -9,36 +9,45 @@ #include #include #include +#include // needed for NULL to be defined /* Only wrap setrlimit if the new usetrlimit is not present and setrlimit sucks */ #if defined(__NR_usetrlimit) - /* just call usetrlimit() */ # define __NR___syscall_usetrlimit __NR_usetrlimit static __always_inline _syscall2(int, __syscall_usetrlimit, enum __rlimit_resource, resource, const struct rlimit *, rlim) -int setrlimit(__rlimit_resource_t resource, struct rlimit *rlimits) +int setrlimit(__rlimit_resource_t resource, const struct rlimit *rlimits) { return __syscall_usetrlimit(resource, rlimits); } -#elif !defined(__UCLIBC_HANDLE_OLDER_RLIMIT__) +#else + +# if !defined(__UCLIBC_HANDLE_OLDER_RLIMIT__) +# if defined(__NR_prlimit64) +int setrlimit(__rlimit_resource_t resource, const struct rlimit *rlimits) +{ + return INLINE_SYSCALL (prlimit64, 4, 0, resource, rlimits, NULL); +} +# else /* We don't need to wrap setrlimit() */ _syscall2(int, setrlimit, __rlimit_resource_t, resource, const struct rlimit *, rlim) +# endif -#else +# else -# define __need_NULL -# include -# include -# include +# define __need_NULL +# include +# include +# include /* we have to handle old style setrlimit() */ -# define __NR___syscall_setrlimit __NR_setrlimit +# define __NR___syscall_setrlimit __NR_setrlimit static __always_inline _syscall2(int, __syscall_setrlimit, int, resource, const struct rlimit *, rlim) @@ -57,8 +66,13 @@ int setrlimit(__rlimit_resource_t resource, const struct rlimit *rlimits) RLIM_INFINITY >> 1); rlimits_small.rlim_max = MIN((unsigned long int) rlimits->rlim_max, RLIM_INFINITY >> 1); +# if defined(__NR_prlimit64) + return INLINE_SYSCALL (prlimit64, 4, 0, resource, &rlimits_small, NULL); +# else return __syscall_setrlimit(resource, &rlimits_small); +# endif } +# endif #endif libc_hidden_def(setrlimit) -- cgit v1.2.3