.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
-.\"O .BR EPERM .
.B EPERM
-.\"O The process group ID of any process
-.\"O equals the PID of the calling process.
+.\"O The process group ID of any process equals the PID of the calling process.
.\"O Thus, in particular,
.\"O .BR setsid ()
.\"O fails if the calling process is already a process group leader.