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getegid(2) [bsd man page]

GETGID(2)							System Calls Manual							 GETGID(2)

NAME
getgid, getegid - get group identity SYNOPSIS
#include <sys/types.h> gid = getgid() gid_t gid; egid = getegid() gid_t egid; DESCRIPTION
Getgid returns the real group ID of the current process, getegid 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, and it is for such processes that getgid is most useful. SEE ALSO
getuid(2), setregid(2), setgid(3) 4.2 Berkeley Distribution January 7, 1986 GETGID(2)

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GETGID(2)						      BSD System Calls Manual							 GETGID(2)

NAME
getgid, getegid -- get group process identification LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> gid_t getgid(void); gid_t getegid(void); DESCRIPTION
The getgid() function 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-group-id of the calling process. ERRORS
The getgid() and getegid() functions are always successful, and no return value is reserved to indicate an error. SEE ALSO
getuid(2), setgid(2), setgroups(2), setregid(2) STANDARDS
getgid() and getegid() conform to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getgid() function appeared in Version 4 AT&T UNIX. BSD
April 3, 2010 BSD

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