linux-master/fs/fcntl.c

718                              struct fown_struct *fown, int sig)
725 	ret = ((uid_eq(fown->euid, GLOBAL_ROOT_UID) ||
726 		uid_eq(fown->euid, cred->suid) || uid_eq(fown->euid, cred->uid) ||
727 		uid_eq(fown->uid,  cred->suid) || uid_eq(fown->uid,  cred->uid)) &&
728 	       !security_file_send_sigiotask(p, fown, sig));
734 			       struct fown_struct *fown,
741 	int signum = READ_ONCE(fown->signum);
743 	if (!sigio_perm(p, fown, signum))
789 void send_sigio(struct fown_struct *fown, int fd, int band)
796 	read_lock_irqsave(&fown->lock, flags);
798 	type = fown->pid_type;
799 	pid = fown->pid;
807 			send_sigio_to_task(p, fown, fd, band, type);
812 			send_sigio_to_task(p, fown, fd, band, type);
817 	read_unlock_irqrestore(&fown->lock, flags);
821 				struct fown_struct *fown, enum pid_type type)
823 	if (sigio_perm(p, fown, SIGURG))
827 int send_sigurg(struct fown_struct *fown)
835 	read_lock_irqsave(&fown->lock, flags);
837 	type = fown->pid_type;
838 	pid = fown->pid;
848 			send_sigurg_to_task(p, fown, type);
853 			send_sigurg_to_task(p, fown, type);
858 	read_unlock_irqrestore(&fown->lock, flags);
1000 		struct fown_struct *fown;
1010 			fown = &fa->fa_file->f_owner;
1014 			if (!(sig == SIGURG && fown->signum == 0))
1015 				send_sigio(fown, fa->fa_fd, band);