projects / unix-history / blame
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1 | .\" Copyright (c) 1980 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 6fa8e3b5 | 5 | .\" @(#)creat.2 6.1 (Berkeley) %G% |
| 7d589817 | 6 | .\" |
| 6fa8e3b5 | 7 | .TH CREAT 2 "" |
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8 | .UC 4 |
| 9 | .SH NAME | |
| 10 | creat \- create a new file | |
| 11 | .SH SYNOPSIS | |
| 12 | .nf | |
| 13 | .B creat(name, mode) | |
| 14 | .B char *name; | |
| 15 | .fi | |
| 16 | .SH DESCRIPTION | |
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17 | .B "This interface is obsoleted by open(2). |
| 18 | .PP | |
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19 | .I Creat |
| 20 | creates a new file or prepares to rewrite an existing | |
| 21 | file called | |
| a854dd01 | 22 | .IR name , |
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23 | given as the address of a null-terminated string. |
| 24 | If the file did not exist, it is given | |
| 25 | mode | |
| 26 | .IR mode , | |
| 27 | as modified by the process's mode mask (see | |
| 28 | .IR umask (2)). | |
| 29 | Also see | |
| 30 | .IR chmod (2) | |
| 31 | for the | |
| 32 | construction of the | |
| 33 | .I mode | |
| 34 | argument. | |
| 35 | .PP | |
| 36 | If the file did exist, its mode and owner remain unchanged | |
| 37 | but it is truncated to 0 length. | |
| 38 | .PP | |
| 39 | The file is also opened for writing, and its file descriptor | |
| 40 | is returned. | |
| a854dd01 | 41 | .SH NOTES |
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42 | The |
| 43 | .I mode | |
| 44 | given is arbitrary; it need not allow | |
| 45 | writing. | |
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46 | This feature has been used in the past by |
| 47 | programs to construct a simple exclusive locking | |
| 48 | mechanism. It is replaced by the O_EXCL open | |
| 49 | mode, or | |
| 50 | .IR flock (2) | |
| 51 | facilitity. | |
| 52 | .SH "RETURN VALUE | |
| 53 | The value \-1 is returned if an error occurs. Otherwise, | |
| 54 | the call returns a non-negative descriptor which only permits | |
| 55 | writing. | |
| 56 | .SH ERRORS | |
| 57 | .I Creat | |
| 58 | will fail and the file will not be created or truncated | |
| 59 | if one of the following occur: | |
| 60 | .TP 15 | |
| 61 | [EPERM] | |
| 62 | The argument contains a byte with the high-order bit set. | |
| 63 | .TP 15 | |
| 64 | [ENOTDIR] | |
| 65 | A component of the path prefix is not a directory. | |
| 66 | .TP 15 | |
| 67 | [EACCES] | |
| 68 | A needed directory does not have search permission. | |
| 69 | .TP 15 | |
| 70 | [EACCES] | |
| 71 | The file does not exist and the directory | |
| 72 | in which it is to be created is not writable. | |
| 73 | .TP 15 | |
| 74 | [EACCES] | |
| 75 | The file exists, but it is unwritable. | |
| 76 | .TP 15 | |
| 77 | [EISDIR] | |
| 78 | The file is a directory. | |
| 79 | .TP 15 | |
| 80 | [EMFILE] | |
| 81 | There are already too many files open. | |
| 82 | .TP 15 | |
| 83 | [EROFS] | |
| 84 | The named file resides on a read-only file system. | |
| 85 | .TP 15 | |
| 86 | [ENXIO] | |
| 87 | The file is a character special or block special file, and | |
| 88 | the associated device does not exist. | |
| 89 | .TP 15 | |
| 90 | [ETXTBSY] | |
| 91 | The file is a pure procedure (shared text) file that is being | |
| 92 | executed. | |
| 93 | .TP 15 | |
| 94 | [EFAULT] | |
| 95 | .I Name | |
| 96 | points outside the process's allocated address space. | |
| 97 | .TP 15 | |
| 98 | [ELOOP] | |
| 99 | Too many symbolic links were encountered in translating the | |
| 100 | pathname. | |
| 101 | .TP 15 | |
| 102 | [EOPNOTSUPP] | |
| 103 | The file was a socket (not currently implemented). | |
| 7d589817 | 104 | .SH "SEE ALSO" |
| a854dd01 | 105 | open(2), write(2), close(2), chmod(2), umask(2) |