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   getresgid    ( 2 )

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Имя (Name)

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

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Синопсис (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);

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Описание (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.

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Возвращаемое значение (Return value)

On success, zero is returned.  On error, -1 is returned, and
       errno is set to indicate the error.

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Ошибки (Error)

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

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Версии (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.

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Стандарты (Conforming to)

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

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Примечание (Note)

The original Linux getresuid() and getresgid() system calls
       supported only 16-bit user and group IDs.  Subsequently, Linux
       2.4 added getresuid32() and getresgid32(), supporting 32-bit IDs.
       The glibc getresuid() and getresgid() wrapper functions
       transparently deal with the variations across kernel versions.

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Смотри также (See also)

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

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