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getgroups(2) [opensolaris man page]

getgroups(2)							   System Calls 						      getgroups(2)

NAME
getgroups, setgroups - get or set supplementary group access list IDs SYNOPSIS
#include <unistd.h> int getgroups(int gidsetsize, gid_t *grouplist); int setgroups(int ngroups, const gid_t *grouplist); DESCRIPTION
The getgroups() function gets the current supplemental group access list of the calling process and stores the result in the array of group IDs specified by grouplist. This array has gidsetsize entries and must be large enough to contain the entire list. This list cannot be larger than NGROUPS_UMAX. If gidsetsize equals 0, getgroups() will return the number of groups to which the calling process belongs without modifying the array pointed to by grouplist. The setgroups() function sets the supplementary group access list of the calling process from the array of group IDs specified by grou- plist. The number of entries is specified by ngroups and can not be greater than NGROUPS_MAX. RETURN VALUES
Upon successful completion, getgroups() returns the number of supplementary group IDs set for the calling process and setgroups() returns 0. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The getgroups() and setgroups() functions will fail if: EFAULT A referenced part of the array pointed to by grouplist is an illegal address. The getgroups() function will fail if: EINVAL The value of gidsetsize is non-zero and less than the number of supplementary group IDs set for the calling process. The setgroups() function will fail if: EINVAL The value of ngroups is greater than {NGROUPS_MAX}. EPERM The {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process. USAGE
Use of the setgroups() function requires the {PRIV_PROC_SETID} privilege. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |getgroups() is Standard. | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
groups(1), chown(2), getuid(2), setuid(2), getgrnam(3C), initgroups(3C), attributes(5), privileges(5), standards(5) SunOS 5.11 8 Sep 2006 getgroups(2)

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GETGROUPS(2)						     Linux Programmer's Manual						      GETGROUPS(2)

NAME
getgroups, setgroups - get/set list of supplementary group IDs SYNOPSIS
#include <sys/types.h> #include <unistd.h> int getgroups(int size, gid_t list[]); #include <grp.h> int setgroups(size_t size, const gid_t *list); DESCRIPTION
getgroups Up to size supplementary group IDs are returned in list. It is unspecified whether the effective group ID of the calling process is included in the returned list. (Thus, an application should also call getegid(2) and add or remove the resulting value.) If size is zero, list is not modified, but the total number of supplementary group IDs for the process is returned. setgroups Sets the supplementary group IDs for the process. Only the super-user may use this function. RETURN VALUE
getgroups On success, the number of supplementary group IDs is returned. On error, -1 is returned, and errno is set appropriately. setgroups On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT list has an invalid address. EPERM For setgroups, the user is not the super-user. EINVAL For setgroups, size is greater than NGROUPS (32 for Linux 2.0.32). For getgroups, size is less than the number of supplementary group IDs, but is not zero. NOTES
A process can have up to at least NGROUPS_MAX supplementary group IDs in addition to the effective group ID. The set of supplementary group IDs is inherited from the parent process and may be changed using setgroups. The maximum number of supplementary group IDs can be found using sysconf(3): long ngroups_max; ngroups_max = sysconf(_SC_NGROUPS_MAX); The maximal return value of getgroups cannot be larger than one more than the value obtained this way. The prototype for setgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not defining _POSIX_SOURCE or compiling with the -ansi flag). CONFORMING TO
SVr4, SVID (issue 4 only; these calls were not present in SVr3), X/OPEN, 4.3BSD. The getgroups function is in POSIX.1. Since setgroups requires privilege, it is not covered by POSIX.1. SEE ALSO
initgroups(3), getgid(2), setgid(2) Linux 2.0.32 1997-12-10 GETGROUPS(2)

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