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+.TH BUS_CHMOD 3 BUS
+.SH NAME
+bus_chmod - Change bus mode bits
+.SH SYNOPSIS
+.LP
+.nf
+#include <bus.h>
+.P
+int bus_chmod(const char *\fIfile\fP, mode_t \fImode\fP);
+.fi
+.SH DESCRIPTION
+The
+.BR bus_chmod ()
+function gives access to the bus associated with \fIfile\fP
+according to the following rules:
+.TP
+*
+If (\fImode\fP &S_IRWXU) the owner should be given full access to the
+bus.  Otherwise the owner should have no access.
+.TP
+*
+If (\fImode\fP &S_IRWXG) the group should be given read and write
+access to the bus.  Otherwise the group should have no access.
+.TP
+*
+If (\fImode\fP &S_IRWXO) others (except the group) should be given
+read and write access to the bus.  Otherwise others should have no
+access.
+.PP
+The current permissions of a bus can be retrieved by running
+.BR stat (3)
+over the \fIpathname\fP of the bus.
+.SH RETURN VALUES
+Upon successful completion, the function returns 0.  Otherwise the
+function returns -1 and sets \fIerrno\fP to indicate the error.
+.SH ERRORS
+The
+.BR bus_chown (3)
+function may fail and set \fIerrno\fP to any of the
+errors specified for
+.BR bus_open (3),
+.BR chmod (3),
+.BR semget (3),
+.BR shmget (3)
+and
+.BR shmctl (3)
+as well as any errors specified for the \fIIPC_STAT\fP and
+\fIIPC_SET\fP commands for
+.BR semctl (3).
+.SH SEE ALSO
+.BR bus-create (1),
+.BR bus (5),
+.BR libbus (7),
+.BR bus_open (3),
+.BR bus_read (3),
+.BR stat (3)