setreuid()

set real and effective user IDs of calling process 

Function

SYNOPSIS

#include <unistd.h>

int setreuid(uid_t ruid, uid_t euid);

DESCRIPTION

The setreuid() function sets the real and effective user IDs of the calling process.

When the first NuTCRACKER Platform process is executed in a new process group, the real user and group IDs, effective user and group IDs, and saved user and group IDs of the process are set based on the process token.

When a NuTCRACKER Platform process calls one of the exec() functions to execute a file (program), effective user and group IDs and saved user and group IDs are inherited by the new process if it is a NuTCRACKER Platform application.

PARAMETERS

ruid 

Is the new real user ID. If this is -1, the real user ID is not changed.

euid 

Is the new effective user ID. If this is -1, the effective user ID is not changed.

RETURN VALUES

If successful, setreuid() returns a value of zero. On failure, it returns -1 and sets errno to one of the following values:

EINVAL 

The value of ruid or euid is out of range.

EPERM 

The process does not have appropriate privileges (the effective user ID is not 0) and ruid and euid do not match the real user ID or the saved user ID.

CONFORMANCE

UNIX 98, with exceptions.

MULTITHREAD SAFETY LEVEL

MT-Safe.

PORTING ISSUES

The 8.1/2012R2/10/2016/2019/11/2022 security model is significantly different from the UNIX security model. The NuTCRACKER Platform mapping of the UNIX security model to Windows, and vice-versa, is discussed in detail under Security in the Windows Concepts chapter of the PTC MKS Toolkit UNIX to Windows Porting Guide.

On 8.1/2012R2/10/2016/2019/11/2022, the Administrator and System accounts are mapped to uid 0; only these accounts have permission to execute setreuid().

AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Functions:
_NutForkExecl(), _NutForkExecle(), _NutForkExeclp(), _NutForkExeclpe(), _NutForkExecv(), _NutForkExecve(), _NutForkExecvp(), _NutForkExecvpe(), execl(), execle(), execlp(), execlpe(), execv(), execve(), execvp(), execvpe(), getegid(), geteuid(), getgid(), getuid(), setgid(), setregid(), setuid()

PTC MKS Toolkit 10.4 Documentation Build 39.