projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright (C), 1994, Graeme W. Wilford. (Wilf.) |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
| fea681da MK |
20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| c13182ef | 23 | .\" Fri Jul 29th 12:56:44 BST 1994 Wilf. <G.Wilford@ee.surrey.ac.uk> |
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24 | .\" Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com> |
| 25 | .\" Modified 2002-03-09 by aeb | |
| 26 | .\" | |
| 27 | .TH SETGID 2 2002-03-09 "Linux 2.5" "Linux Programmer's Manual" | |
| 28 | .SH NAME | |
| 29 | setgid \- set group identity | |
| 30 | .SH SYNOPSIS | |
| 31 | .B #include <sys/types.h> | |
| 32 | .br | |
| 33 | .B #include <unistd.h> | |
| 34 | .sp | |
| 35 | .BI "int setgid(gid_t " gid ); | |
| 36 | .SH DESCRIPTION | |
| e511ffb6 | 37 | .BR setgid () |
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38 | sets the effective group ID of the current process. |
| 39 | If the caller is the | |
| d9df8ff8 | 40 | superuser, the real GID and saved set-group-ID are also set. |
| fea681da | 41 | |
| c13182ef | 42 | Under Linux, |
| e511ffb6 | 43 | .BR setgid () |
| fea681da | 44 | is implemented like the POSIX version with the _POSIX_SAVED_IDS feature. |
| d9df8ff8 | 45 | This allows a set-group-ID program that is not set-user-ID-root |
| 880f5b4b | 46 | to drop all of its group |
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47 | privileges, do some un-privileged work, and then re-engage the original |
| 48 | effective group ID in a secure manner. | |
| 49 | .SH "RETURN VALUE" | |
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50 | On success, zero is returned. |
| 51 | On error, \-1 is returned, and | |
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52 | .I errno |
| 53 | is set appropriately. | |
| 54 | .SH ERRORS | |
| 55 | .TP | |
| 56 | .B EPERM | |
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57 | The calling process is not privileged (does not have the |
| 58 | CAP_SETGID capability), and | |
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59 | .I gid |
| 60 | does not match the effective group ID or saved set-group-ID of | |
| 61 | the calling process. | |
| 62 | .SH "CONFORMING TO" | |
| 97c1eac8 | 63 | SVr4, POSIX.1-2001. |
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64 | .SH "SEE ALSO" |
| 65 | .BR getgid (2), | |
| 66 | .BR setegid (2), | |
| 67 | .BR setregid (2), | |
| 68 | .BR capabilities (7) |