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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
2 | .\" | |
3 | .\" This manpage is Copyright (C) 2006, Michael Kerrisk | |
4 | .\" | |
5 | .\" Permission is granted to make and distribute verbatim copies of this | |
6 | .\" manual provided the copyright notice and this permission notice are | |
7 | .\" preserved on all copies. | |
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9 | .\" Permission is granted to copy and distribute modified versions of this | |
10 | .\" manual under the conditions for verbatim copying, provided that the | |
11 | .\" entire resulting derived work is distributed under the terms of a | |
12 | .\" permission notice identical to this one. | |
c13182ef | 13 | .\" |
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14 | .\" Since the Linux kernel and libraries are constantly changing, this |
15 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
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19 | .\" which is licensed free of charge, as they might when working | |
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c13182ef | 21 | .\" |
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22 | .\" Formatted or processed versions of this manual, if unaccompanied by |
23 | .\" the source, must acknowledge the copyright and authors of this work. | |
24 | .\" | |
25 | .\" | |
26 | .TH FSTATAT 2 2006-04-30 "Linux 2.6.16" "Linux Programmer's Manual" | |
27 | .SH NAME | |
ce372a5b | 28 | fstatat \- get file status relative to a directory file descriptor |
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29 | .SH SYNOPSIS |
30 | .nf | |
d44417fb | 31 | .B #define _ATFILE_SOURCE |
f4d34a38 | 32 | .B #include <sys/stat.h> |
956a6446 | 33 | .sp |
1343b604 | 34 | .BI "int fstatat(int " dirfd ", const char *" pathname ", struct stat *" \ |
c13182ef | 35 | buf , |
521bf584 | 36 | .BI " int " flags ); |
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37 | .fi |
38 | .SH DESCRIPTION | |
39 | The | |
40 | .BR fstatat () | |
41 | system call operates in exactly the same way as | |
42 | .BR stat (2), | |
43 | except for the differences described in this manual page. | |
44 | ||
c13182ef | 45 | If the pathname given in |
1343b604 | 46 | .I pathname |
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47 | is relative, then it is interpreted relative to the directory |
48 | referred to by the file descriptor | |
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49 | .IR dirfd |
50 | (rather than relative to the current working directory of | |
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51 | the calling process, as is done by |
52 | .BR stat (2) | |
53 | for a relative pathname). | |
54 | ||
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55 | If |
56 | .I pathname | |
c13182ef | 57 | is relative and |
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58 | .I dirfd |
59 | is the special value | |
60 | .BR AT_FDCWD , | |
61 | then | |
1343b604 | 62 | .I pathname |
c13182ef | 63 | is interpreted relative to the current working |
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64 | directory of the calling process (like |
65 | .BR stat (2)). | |
66 | ||
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67 | If |
68 | .IR pathname | |
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69 | is absolute, then |
70 | .I dirfd | |
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71 | is ignored. |
72 | ||
73 | .I flags | |
74 | can either be 0, or include the following flag: | |
75 | .TP | |
76 | .B AT_SYMLINK_NOFOLLOW | |
c13182ef | 77 | If |
1343b604 | 78 | .I pathname |
c13182ef | 79 | is a symbolic link, do not dereference it: |
956a6446 | 80 | instead return information about the link itself, like |
c13182ef | 81 | .BR lstat (2). |
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82 | (By default, |
83 | .BR fstatat () | |
160c2d5a | 84 | dereferences symbolic links, like |
7005bc22 | 85 | .BR stat (2).) |
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86 | .SH "RETURN VALUE" |
87 | On success, | |
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88 | .BR fstatat () |
89 | returns 0. | |
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90 | On error, \-1 is returned and |
91 | .I errno | |
92 | is set to indicate the error. | |
93 | .SH ERRORS | |
94 | The same errors that occur for | |
95 | .BR stat (2) | |
96 | can also occur for | |
97 | .BR fstatat (). | |
c13182ef | 98 | The following additional errors can occur for |
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99 | .BR fstatat (): |
100 | .TP | |
101 | .B EBADF | |
102 | .I dirfd | |
103 | is not a valid file descriptor. | |
104 | .TP | |
105 | .B EINVAL | |
106 | Invalid flag specified in | |
107 | .IR flags . | |
108 | .TP | |
109 | .B ENOTDIR | |
1343b604 | 110 | .I pathname |
b328773d | 111 | is relative and |
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112 | .I dirfd |
113 | is a file descriptor referring to a file other than a directory. | |
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114 | .SH VERSIONS |
115 | .BR fstatat () | |
116 | was added to Linux in kernel 2.6.16. | |
117 | .SH "CONFORMING TO" | |
118 | This system call is non-standard but is proposed | |
119 | for inclusion in a future revision of POSIX.1. | |
120 | A similar system call exists on Solaris. | |
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121 | .SH NOTES |
122 | See | |
123 | .BR openat (2) | |
124 | for an explanation of the need for | |
125 | .BR fstatat (). | |
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126 | .SH "SEE ALSO" |
127 | .BR openat (2), | |
128 | .BR path_resolution (2), | |
129 | .BR stat (2) |