diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/kernel-features.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index 3aa2052c71..f65a262994 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -115,3 +115,38 @@ #if __LINUX_KERNEL_VERSION >= 0x040500 # define __ASSUME_COPY_FILE_RANGE 1 #endif + +/* Support for clone call used on fork. The signature varies across the + architectures with current 4 different variants: + + 1. long int clone (unsigned long flags, unsigned long newsp, + int *parent_tidptr, unsigned long tls, + int *child_tidptr) + + 2. long int clone (unsigned long newsp, unsigned long clone_flags, + int *parent_tidptr, int * child_tidptr, + unsigned long tls) + + 3. long int clone (unsigned long flags, unsigned long newsp, + int stack_size, int *parent_tidptr, + int *child_tidptr, unsigned long tls) + + 4. long int clone (unsigned long flags, unsigned long newsp, + int *parent_tidptr, int *child_tidptr, + unsigned long tls) + + The fourth variant is intended to be used as the default for newer ports, + Also IA64 uses the third variant but with __NR_clone2 instead of + __NR_clone. + + The macros names to define the variant used for the architecture is + similar to kernel: + + - __ASSUME_CLONE_BACKWARDS: for variant 1. + - __ASSUME_CLONE_BACKWARDS2: for variant 2 (s390). + - __ASSUME_CLONE_BACKWARDS3: for variant 3 (microblaze). + - __ASSUME_CLONE_DEFAULT: for variant 4. + - __ASSUME_CLONE2: for clone2 with variant 3 (ia64). + */ + +#define __ASSUME_CLONE_DEFAULT 1 |