GNU/Linux man pages
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Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 2.1AS(Slurm) |
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getgroups(2) |
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getgroups, setgroups − get/set list of supplementary group IDs
#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);
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.
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.
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EFAULT |
list has an invalid address. | ||
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EPERM |
For setgroups, the user is not the super-user. | ||
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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. |
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).
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.
initgroups(3), getgid(2), setgid(2)
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getgroups(2) | |