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+'\" et
+.TH FCHMOD "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+fchmod
+\(em change mode of a file
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/stat.h>
+.P
+int fchmod(int \fIfildes\fP, mode_t \fImode\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIfchmod\fR()
+function shall be equivalent to
+\fIchmod\fR()
+except that the file whose permissions are changed is specified
+by the file descriptor
+.IR fildes .
+.P
+If
+.IR fildes
+references a shared memory object, the
+\fIfchmod\fR()
+function need only affect the S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP,
+S_IROTH, and S_IWOTH file permission bits.
+.P
+If
+.IR fildes
+references a typed memory object, the behavior of
+\fIfchmod\fR()
+is unspecified.
+.P
+If
+.IR fildes
+refers to a socket, the behavior of
+\fIfchmod\fR()
+is unspecified.
+.P
+If
+.IR fildes
+refers to a STREAM (which is
+\fIfattach\fR()-ed
+into the file system name space) the call returns successfully, doing
+nothing.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIfchmod\fR()
+shall return 0. Otherwise, it shall return \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIfchmod\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not an open file descriptor.
+.TP
+.BR EPERM
+The effective user ID does not match the owner of the file and the
+process does not have appropriate privileges.
+.TP
+.BR EROFS
+The file referred to by
+.IR fildes
+resides on a read-only file system.
+.P
+The
+\fIfchmod\fR()
+function may fail if:
+.TP
+.BR EINTR
+The
+\fIfchmod\fR()
+function was interrupted by a signal.
+.TP
+.BR EINVAL
+The value of the
+.IR mode
+argument is invalid.
+.TP
+.BR EINVAL
+The
+.IR fildes
+argument refers to a pipe and the implementation disallows execution of
+\fIfchmod\fR()
+on a pipe.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+.SS "Changing the Current Permissions for a File"
+.P
+The following example shows how to change the permissions for a
+file named
+.BR /home/cnd/mod1
+so that the owner and group have read/write/execute permissions, but
+the world only has read/write permissions.
+.sp
+.RS 4
+.nf
+
+#include <sys/stat.h>
+#include <fcntl.h>
+.P
+mode_t mode;
+int    fildes;
+\&...
+fildes = open("/home/cnd/mod1", O_RDWR);
+fchmod(fildes, S_IRWXU | S_IRWXG | S_IROTH | S_IWOTH);
+.fi
+.P
+.RE
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIchmod\fR\^(\|)",
+.IR "\fIchown\fR\^(\|)",
+.IR "\fIcreat\fR\^(\|)",
+.IR "\fIfcntl\fR\^(\|)",
+.IR "\fIfstatat\fR\^(\|)",
+.IR "\fIfstatvfs\fR\^(\|)",
+.IR "\fImknod\fR\^(\|)",
+.IR "\fIopen\fR\^(\|)",
+.IR "\fIread\fR\^(\|)",
+.IR "\fIwrite\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<sys_stat.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .