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1 | .\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
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8 | .\" Permission is granted to copy and distribute modified versions of this | |
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11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
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18 | .\" which is licensed free of charge, as they might when working | |
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c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
fea681da | 24 | .\" |
c11b1abf | 25 | .\" Modified, 2003-05-26, Michael Kerrisk, <mtk.manpages@gmail.com> |
1e7eb3a7 | 26 | .TH SETRESUID 2 2010-11-22 "Linux" "Linux Programmer's Manual" |
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27 | .SH NAME |
28 | setresuid, setresgid \- set real, effective and saved user or group ID | |
29 | .SH SYNOPSIS | |
b80f966b | 30 | .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
fea681da MK |
31 | .br |
32 | .B #include <unistd.h> | |
33 | .sp | |
34 | .BI "int setresuid(uid_t " ruid ", uid_t " euid ", uid_t " suid ); | |
35 | .br | |
c13182ef | 36 | .BI "int setresgid(gid_t " rgid ", gid_t " egid ", gid_t " sgid ); |
fea681da | 37 | .SH DESCRIPTION |
e511ffb6 | 38 | .BR setresuid () |
d9df8ff8 | 39 | sets the real user ID, the effective user ID, and the |
a1ffe9f5 | 40 | saved set-user-ID of the calling process. |
fea681da | 41 | |
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42 | Unprivileged user processes |
43 | may change the real UID, | |
44 | effective UID, and saved set-user-ID, each to one of: | |
c13182ef | 45 | the current real UID, the current effective UID or the |
d9df8ff8 | 46 | current saved set-user-ID. |
fea681da | 47 | |
0b9bdf82 | 48 | Privileged processes (on Linux, those having the \fBCAP_SETUID\fP capability) |
c13182ef | 49 | may set the real UID, effective UID, and |
d9df8ff8 | 50 | saved set-user-ID to arbitrary values. |
fea681da | 51 | |
c4bb193f | 52 | If one of the arguments equals \-1, the corresponding value is not changed. |
fea681da | 53 | |
bb40bc01 | 54 | Regardless of what changes are made to the real UID, effective UID, |
9ee4a2b6 | 55 | and saved set-user-ID, the filesystem UID is always set to the same |
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56 | value as the (possibly new) effective UID. |
57 | ||
fea681da | 58 | Completely analogously, |
e511ffb6 | 59 | .BR setresgid () |
c13182ef | 60 | sets the real GID, effective GID, and saved set-group-ID |
9ee4a2b6 | 61 | of the calling process (and always modifies the filesystem GID |
bb40bc01 | 62 | to be the same as the effective GID), |
60b9e97c | 63 | with the same restrictions for unprivileged processes. |
47297adb | 64 | .SH RETURN VALUE |
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65 | On success, zero is returned. |
66 | On error, \-1 is returned, and | |
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67 | .I errno |
68 | is set appropriately. | |
69 | .SH ERRORS | |
70 | .TP | |
71 | .B EAGAIN | |
72 | .I uid | |
d9df8ff8 | 73 | does not match the current UID and this call would |
2f0af33b | 74 | bring that user ID over its |
0daa9e92 | 75 | .B RLIMIT_NPROC |
2f0af33b | 76 | resource limit. |
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77 | .TP |
78 | .B EPERM | |
0b9bdf82 | 79 | The calling process is not privileged (did not have the \fBCAP_SETUID\fP |
d3c8b3e9 | 80 | capability) and tried to change the IDs to values that are not permitted. |
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81 | .SH VERSIONS |
82 | These calls are available under Linux since Linux 2.1.44. | |
47297adb | 83 | .SH CONFORMING TO |
c8f2dd47 | 84 | These calls are nonstandard; |
97c1eac8 | 85 | they also appear on HP-UX and some of the BSDs. |
fea681da | 86 | .SH NOTES |
1e7eb3a7 | 87 | Under HP-UX and FreeBSD, the prototype is found in |
fea681da | 88 | .IR <unistd.h> . |
cc4615cc | 89 | Under Linux the prototype is provided by glibc since version 2.3.2. |
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90 | |
91 | The original Linux | |
92 | .BR setresuid () | |
93 | and | |
94 | .BR setresgid () | |
95 | system calls supported only 16-bit user and group IDs. | |
c5662d5d | 96 | Subsequently, Linux 2.4 added |
ea03a3ac MK |
97 | .BR setresuid32 () |
98 | and | |
99 | .BR setresgid32 (), | |
100 | supporting 32-bit IDs. | |
101 | The glibc | |
102 | .BR setresuid () | |
103 | and | |
104 | .BR setresgid () | |
105 | wrapper functions transparently deal with the variations across kernel versions. | |
47297adb | 106 | .SH SEE ALSO |
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107 | .BR getresuid (2), |
108 | .BR getuid (2), | |
bb40bc01 | 109 | .BR setfsgid (2), |
f0c34053 | 110 | .BR setfsuid (2), |
fea681da MK |
111 | .BR setreuid (2), |
112 | .BR setuid (2), | |
0a90178c | 113 | .BR capabilities (7), |
0a4f8b7b | 114 | .BR credentials (7) |