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)
None.
Смотри также (See also)
getegid(3p), geteuid(3p), getgid(3p), setegid(3p), seteuid(3p),
setgid(3p), setregid(3p), setreuid(3p), setuid(3p)
The Base Definitions volume of POSIX.1‐2017, sys_types.h(0p),
unistd.h(0p)
