grp.h - group structure
The <grp.h> header shall declare the structure group which shall include the following members:char *gr_name The name of the group. gid_t gr_gid Numerical group ID. char **gr_mem Pointer to a null-terminated array of character pointers to member names.
The gid_t type shall be defined as described in <sys/types.h>.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.struct group *getgrgid(gid_t); struct group *getgrnam(const char *); [TSF] int getgrgid_r(gid_t, struct group *, char *, size_t, struct group **); int getgrnam_r(const char *, struct group *, char *, size_t , struct group **); [XSI] struct group *getgrent(void); void endgrent(void); void setgrent(void);
<sys/types.h>, the System Interfaces volume of IEEE Std 1003.1-2001, endgrent(), getgrgid(), getgrnam()
First released in Issue 1.
The DESCRIPTION is updated for alignment with the POSIX Threads Extension.
The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:
The definition of gid_t is mandated.
The getgrgid_r() and getgrnam_r() functions are marked as part of the Thread-Safe Functions option.