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man:getresuid

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

NAME

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

SYNOPSIS

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

DESCRIPTION

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

RETURN VALUE

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

ERRORS

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

VERSIONS

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

CONFORMING TO

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

NOTES

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

SEE ALSO

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

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

Linux 2017-09-15 GETRESUID(2)

/data/webs/external/dokuwiki/data/pages/man/getresuid.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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