sys_signalfd4 2155 fs/compat.c return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags); sys_signalfd4 265 fs/signalfd.c return sys_signalfd4(ufd, user_mask, sizemask, 0); sys_signalfd4 616 include/linux/syscalls.h asmlinkage long sys_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask, int flags);