`getuid.3p` ( 3 )

получить настоящий идентификатор пользователя (get a real user ID)

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

Имя (Name)

getuid — get a real user ID

Синопсис (Synopsis)

#include <unistd.h>

uid_t getuid(void);

Описание (Description)

The getuid() function shall return the real user ID of the calling process. The getuid() function shall not modify errno.

Возвращаемое значение (Return value)

The getuid() function shall always be successful and no return value is reserved to indicate the error.

Ошибки (Error)

No errors are defined.

The following sections are informative.

Примеры (Examples)

Setting the Effective User ID to the Real User ID
       The following example sets the effective user ID of the calling
       process to the real user ID.

           #include <unistd.h>
           ...
           seteuid(getuid());

Использование в приложениях (Application usage)

None.

Обоснование (Rationale)

In a conforming environment, getuid() will always succeed. It is possible for implementations to provide an extension where a process in a non-conforming environment will not be associated with a user or group ID. It is recommended that such implementations return (uid_t)-1 and set errno to indicate such an environment; doing so does not violate this standard, since such an environment is already an extension.

Будущие направления (Future directions)