1GETRESUID(2)               Linux Programmer's Manual              GETRESUID(2)
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NAME

6       getresuid, getresgid - get real, effective and saved user/group IDs
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SYNOPSIS

9       #define _GNU_SOURCE         /* See feature_test_macros(7) */
10       #include <unistd.h>
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12       int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
13       int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
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DESCRIPTION

16       getresuid() returns the real UID, the effective UID, and the saved set-
17       user-ID of the calling process, in the arguments ruid, euid, and  suid,
18       respectively.    getresgid()   performs  the  analogous  task  for  the
19       process's group IDs.
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RETURN VALUE

22       On success, zero is returned.  On error, -1 is returned, and  errno  is
23       set appropriately.
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ERRORS

26       EFAULT One  of  the  arguments specified an address outside the calling
27              program's address space.
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VERSIONS

30       These system calls appeared on Linux starting with kernel 2.1.44.
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32       The prototypes  are  given  by  glibc  since  version  2.3.2,  provided
33       _GNU_SOURCE is defined.
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CONFORMING TO

36       These  calls are nonstandard; they also appear on HP-UX and some of the
37       BSDs.
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NOTES

40       The original Linux getresuid() and getresgid() system  calls  supported
41       only  16-bit  user and group IDs.  Subsequently, Linux 2.4 added getre‐
42       suid32() and getresgid32(), supporting 32-bit IDs.   The  glibc  getre‐
43       suid()  and  getresgid()  wrapper functions transparently deal with the
44       variations across kernel versions.
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SEE ALSO

47       getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)
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COLOPHON

50       This page is part of release 4.16 of the Linux  man-pages  project.   A
51       description  of  the project, information about reporting bugs, and the
52       latest    version    of    this    page,    can     be     found     at
53       https://www.kernel.org/doc/man-pages/.
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57Linux                             2017-09-15                      GETRESUID(2)
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