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+'\" et
+.TH UMASK "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
+umask
+\(em set and get the file mode creation mask
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/stat.h>
+.P
+mode_t umask(mode_t \fIcmask\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIumask\fR()
+function shall set the file mode creation mask of the process to
+.IR cmask
+and return the previous value of the mask. Only the file permission
+bits of
+.IR cmask
+(see
+.IR <sys/stat.h> )
+are used; the meaning of the other bits is implementation-defined.
+.P
+The file mode creation mask of the process is used to turn off
+permission bits in the
+.IR mode
+argument supplied during calls to the following functions:
+.IP " *" 4
+\fIopen\fR(),
+\fIopenat\fR(),
+\fIcreat\fR(),
+\fImkdir\fR(),
+\fImkdirat\fR(),
+\fImkfifo\fR(),
+and
+\fImkfifoat\fR()
+.IP " *" 4
+\fImknod\fR(),
+\fImknodat\fR()
+.IP " *" 4
+\fImq_open\fR()
+.IP " *" 4
+\fIsem_open\fR()
+.P
+Bit positions that are set in
+.IR cmask
+are cleared in the mode of the created file.
+.SH "RETURN VALUE"
+The file permission bits in the value returned by
+\fIumask\fR()
+shall be the previous value of the file mode creation mask. The state
+of any other bits in that value is unspecified, except that a
+subsequent call to
+\fIumask\fR()
+with the returned value as
+.IR cmask
+shall leave the state of the mask the same as its state before the
+first call, including any unspecified use of those bits.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+Unsigned argument and return types for
+\fIumask\fR()
+were proposed. The return type and the argument were both changed to
+.BR mode_t .
+.P
+Historical implementations have made use of additional bits in
+.IR cmask
+for their implementation-defined purposes. The addition of the text
+that the meaning of other bits of the field is implementation-defined
+permits these implementations to conform to this volume of POSIX.1\(hy2017.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIcreat\fR\^(\|)",
+.IR "\fIexec\fR\^",
+.IR "\fImkdir\fR\^(\|)",
+.IR "\fImkfifo\fR\^(\|)",
+.IR "\fImknod\fR\^(\|)",
+.IR "\fImq_open\fR\^(\|)",
+.IR "\fIopen\fR\^(\|)",
+.IR "\fIsem_open\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<sys_stat.h>\fP",
+.IR "\fB<sys_types.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 .