setegid()

set effective group ID for calling process 

Function

SYNOPSIS

#include <sys/types.h>

#include <unistd.h>

int setegid(gid_t gid);

DESCRIPTION

The setegid() function sets the effective group ID for 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

gid 

Is the effective group ID.

RETURN VALUES

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

EINVAL 

The value of gid is out of range.

EPERM 

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

CONFORMANCE

4.4BSD, with exceptions.

MULTITHREAD SAFETY LEVEL

MT-Safe.

PORTING ISSUES

The Windows NT/2000/XP/2003/Vista 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 MKS Toolkit UNIX to Windows Porting Guide.

On Windows NT/2000/XP/2003/Vista, the Administrator and System accounts are mapped to uid 0; only these accounts have permission to execute setegid().

AVAILABILITY

MKS Toolkit for Professional Developers
MKS Toolkit for Enterprise Developers
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(), seteuid(), setgid(), setregid(), setreuid(), setuid()

MKS Toolkit 9.2 Documentation Build 16.