*** UNIX MANUAL PAGE BROWSER ***

setgid(2) System Calls Manual setgid(2) NAME setgid - Sets the group ID SYNOPSIS #include <unistd.h> int setgid ( gid_t group_id ); Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being de- veloped for multiple platforms. The additional #include statement is not required on DIGITAL UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these stan- dards. STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: setgid(): POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the new group ID. DESCRIPTION The setgid() function sets the real group ID, effective group ID, and the saved set group ID to the value specified by the group_id parame- ter. If the process does not have superuser privilege, but the group_id pa- rameter is equal to the real group ID or the saved set group ID, the setgid() function sets the effective group ID to group_id. The real group ID and saved set group ID remain unchanged. Any supplementary group IDs of the calling process remain unchanged. RETURN VALUES Upon successful completion, the setgid() function returns 0 (zero). Otherwise, the function returns -1 and sets errno to indicate the er- ror. ERRORS The setgid() function sets errno to the specified values for the fol- lowing conditions: The value of the group_id parameter is invalid. The process does not have superuser privilege and the group_id parameter does not match the real group ID or the saved set group ID. RELATED INFORMATION Functions: exec(2), getgid(2), setuid(2) Standards: standards(5) delim off setgid(2)