projects / unix-history / blame
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1 | .\" Copyright (c) 1980, 1991, 1993 |
| 2 | .\" The Regents of the University of California. All rights reserved. | |
| 542d81aa | 3 | .\" |
| 931b8415 | 4 | .\" %sccs.include.redist.man% |
| 542d81aa | 5 | .\" |
| 15715acc | 6 | .\" @(#)umask.2 8.1 (Berkeley) %G% |
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7 | .\" |
| 8 | .Dd | |
| 9 | .Dt UMASK 2 | |
| 10 | .Os BSD 4 | |
| 11 | .Sh NAME | |
| 12 | .Nm umask | |
| 13 | .Nd set file creation mode mask | |
| 14 | .Sh SYNOPSIS | |
| 15 | .Fd #include <sys/stat.h> | |
| 16 | .Ft mode_t | |
| 17 | .Fn umask "mode_t numask" | |
| 18 | .Sh DESCRIPTION | |
| 19 | The | |
| 20 | .Fn umask | |
| 21 | routine sets the process's file mode creation mask to | |
| 22 | .Fa numask | |
| 23 | and returns the previous value of the mask. The 9 low-order | |
| 24 | access permission | |
| 25 | bits of | |
| 26 | .Fa numask | |
| 27 | are used by system calls, including | |
| 28 | .Xr open 2 , | |
| 29 | .Xr mkdir 2 , | |
| 30 | and | |
| 31 | .Xr mkfifo 2 , | |
| 32 | to turn off corresponding bits | |
| 33 | requested in file mode. | |
| ead8edf9 | 34 | (See |
| 931b8415 | 35 | .Xr chmod 2 ) . |
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36 | This clearing allows each user to restrict the default access |
| 37 | to his files. | |
| 931b8415 | 38 | .Pp |
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39 | The default mask value is S_IWGRP|S_IWOTH (022, write access for the |
| 40 | owner only). | |
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41 | Child processes inherit the mask of the calling process. |
| 42 | .Sh RETURN VALUES | |
| 5a5f5b5e | 43 | The previous value of the file mode mask is returned by the call. |
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44 | .Sh ERRORS |
| 45 | The | |
| 46 | .Fn umask | |
| 47 | function is always successful. | |
| 48 | .Sh SEE ALSO | |
| 49 | .Xr chmod 2 , | |
| 50 | .Xr mknod 2 , | |
| 51 | .Xr open 2 | |
| 52 | .Sh STANDARDS | |
| 53 | The | |
| 54 | .Fn umask | |
| ead8edf9 | 55 | function call is expected to conform to IEEE Std 1003.1-1988 |
| 931b8415 | 56 | .Pq Dq Tn POSIX . |