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FGETGRENT(3) Linux Programmer's Manual FGETGRENT(3) NAME fgetgrent - get group file entry SYNOPSIS #include <stdio.h> #include <sys/types.h> #include <grp.h> struct group *fgetgrent(FILE *stream); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fgetgrent(): Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _SVID_SOURCE DESCRIPTION The fgetgrent() function returns a pointer to a structure containing the group information from the file referred to by stream. The first time it is called it returns the first entry; thereafter, it returns successive entries. The file referred to by stream must have the same format as /etc/group (see group(5)). The group structure is defined in <grp.h> as follows: struct group { char *gr_name; /* group name */ char *gr_passwd; /* group password */ gid_t gr_gid; /* group ID */ char **gr_mem; /* NULL-terminated array of pointers to names of group members */ }; RETURN VALUE The fgetgrent() function returns a pointer to a group structure, or NULL if there are no more entries or an error occurs. In the event of an error, errno is set to indicate the error. ERRORS ENOMEM Insufficient memory to allocate group structure. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬βββββββββββββββββββββββββββ βInterface β Attribute β Value β βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌβββββββββββββββββββββββββββ€ βfgetgrent() β Thread safety β MT-Unsafe race:fgetgrent β βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄βββββββββββββββββββββββββββ CONFORMING TO SVr4. SEE ALSO endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgrnam(3), putgrent(3), setgrent(3), group(5) GNU 2021-03-22 FGETGRENT(3)