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1 | .\" Copyright (C) 2001 Andries Brouwer (aeb@cwi.nl) |
| 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. | |
| 11 | .\" | |
| 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| 13 | .\" manual page may be incorrect or out-of-date.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. | |
| 19 | .\" | |
| 20 | .\" Formatted or processed versions of this manual, if unaccompanied by | |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" [should really be seteuid.3] | |
| 305a0578 | 24 | .\" Modified, 27 May 2004, Michael Kerrisk <mtk-manpages@gmx.net> |
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25 | .\" Added notes on capability requirements |
| 26 | .\" | |
| 27 | .TH SETEGID 2 2004-05-27 "Linux 2.6.6" "Linux Programmer's Manual" | |
| 28 | .SH NAME | |
| 29 | seteuid, setegid \- set effective user or group ID | |
| 30 | .SH SYNOPSIS | |
| 31 | .B #include <sys/types.h> | |
| 32 | .br | |
| 33 | .B #include <unistd.h> | |
| 34 | .sp | |
| 35 | .BI "int seteuid(uid_t " euid ); | |
| 36 | .br | |
| 37 | .BI "int setegid(gid_t " egid ); | |
| 38 | .SH DESCRIPTION | |
| e511ffb6 | 39 | .BR seteuid () |
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40 | sets the effective user ID of the current process. |
| 41 | Unprivileged user processes may only set the effective user ID to the | |
| d9df8ff8 | 42 | real user ID, the effective user ID or the saved set-user-ID. |
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43 | |
| 44 | Precisely the same holds for | |
| e511ffb6 | 45 | .BR setegid () |
| fea681da | 46 | with "group" instead of "user". |
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47 | .\" When |
| 48 | .\" .I euid | |
| 49 | .\" equals \-1, nothing is changed. | |
| 50 | .SH "RETURN VALUE" | |
| 51 | On success, zero is returned. On error, \-1 is returned, and | |
| 52 | .I errno | |
| 53 | is set appropriately. | |
| 54 | .SH ERRORS | |
| 55 | .\" .TP | |
| 56 | .\" .B EINVAL | |
| 57 | .TP | |
| 58 | .B EPERM | |
| 59 | The current process is not privileged (Linux: does not have the | |
| 60 | .B CAP_SETUID | |
| 61 | capability in the case of | |
| 62 | .BR seteuid (), | |
| 63 | or the | |
| 64 | .B CAP_SETGID | |
| 65 | capability in the case of | |
| 66 | .BR setegid ()) | |
| 67 | and | |
| 68 | .I euid | |
| 69 | (resp. | |
| 70 | .IR egid ) | |
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71 | is not the real user (group) ID, the effective user (group) ID, |
| 72 | or the saved set-user-ID (saved set-group-ID). | |
| fea681da | 73 | .SH NOTES |
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74 | Setting the effective user (group) ID to the |
| 75 | saved set-user-ID (saved set-group-ID) is | |
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76 | possible since Linux 1.1.37 (1.1.38). |
| 77 | On an arbitrary system one should check _POSIX_SAVED_IDS. | |
| 78 | .LP | |
| 79 | Under libc4, libc5 and glibc2.0 | |
| 80 | .BI seteuid( euid ) | |
| 81 | is equivalent to | |
| 2bc2f479 | 82 | .BI setreuid(\-1, " euid" ) |
| d9df8ff8 | 83 | and hence may change the saved set-user-ID. |
| fea681da | 84 | Under glibc2.1 it is equivalent to |
| 2bc2f479 | 85 | .BI setresuid(\-1, " euid" ,\-1) |
| d9df8ff8 | 86 | and hence does not change the saved set-user-ID. |
| fea681da | 87 | Similar remarks hold for |
| e511ffb6 | 88 | .BR setegid (). |
| fea681da | 89 | .SH "CONFORMING TO" |
| 97c1eac8 | 90 | 4.3BSD, POSIX.1-2001. |
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91 | .SH "SEE ALSO" |
| 92 | .BR geteuid (2), | |
| 93 | .BR setresuid (2), | |
| 94 | .BR setreuid (2), | |
| 95 | .BR setuid (2), | |
| 96 | .BR capabilities (7) |