getgid(2) System Calls Manual getgid(2)Name
getgid, getegid - get group identity
Syntax
#include <sys/types.h>
#include <unistd.h>
gid = getgid()
gid_t gid;
egid = getegid()
gid_t egid;
Description
The system call returns the real group ID of the current process, and the call returns the effective group ID.
The real group ID is specified at login time.
The effective group ID is more transient and determines additional access permission during execution of a ``set-group-ID'' process. The
call is most useful with processes that are ``set-group-ID.''
Environment
Differs from the System V definition in that the return values are of type int, instead of type unsigned short.
See Alsogetuid(2), setregid(2), setgid(3)getgid(2)
Check Out this Related Man Page
GETGID(2) BSD System Calls Manual GETGID(2)NAME
getgid, getegid -- get group process identification
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
gid_t
getgid(void);
gid_t
getegid(void);
DESCRIPTION
The getgid() system call returns the real group ID of the calling process, getegid() returns the effective group ID of the calling process.
The real group ID is specified at login time.
The real group ID is the group of the user who invoked the program. As the effective group ID gives the process additional permissions dur-
ing the execution of ``set-group-ID'' mode processes, getgid() is used to determine the real-user-id of the calling process.
ERRORS
The getgid() and getegid() system calls are always successful, and no return value is reserved to indicate an error.
SEE ALSO getuid(2), issetugid(2), setgid(2), setregid(2)STANDARDS
The getgid() and getegid() system calls are expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
BSD June 4, 1993 BSD
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