Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 7/13/2023
Public

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PXFSETGID

POSIX Subroutine: Sets the effective group ID of the current process. This routine is only available for Linux and macOS.

Module

USE IFPOSIX

CALL PXFSETGID (igid,ierror)

igid

(Input) INTEGER(4). The group ID.

ierror

(Output) INTEGER(4). The error status.

If successful, ierror is set to zero; otherwise, an error code.

If the caller is the superuser, the real and saved group ID's are also set. This feature allows a program other than root to drop all of its group privileges, do some un-privileged work, and then re-engage the original effective group ID in a secure manner.

CAUTION:

If the user is root then special care must be taken. PXFSETGID checks the effective gid of the caller. If it is the superuser, all process-related group ID's are set to gid. After this has occurred, it is impossible for the program to regain root privileges.

See Also