__NR_fork           6 arch/x86/include/generated/uapi/asm/unistd_32.h #define __NR_fork 2
__NR_fork          61 arch/x86/include/generated/uapi/asm/unistd_64.h #define __NR_fork 57
__NR_fork          51 arch/x86/include/generated/uapi/asm/unistd_x32.h #define __NR_fork (__X32_SYSCALL_BIT + 57)