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SETNETGRENT(3) Linux Programmer's Manual SETNETGRENT(3) NAME setnetgrent, endnetgrent, getnetgrent, getnetgrent_r, innetgr - handle network group entries SYNOPSIS #include <netdb.h> int setnetgrent(const char *netgroup); void endnetgrent(void); int getnetgrent(char **restrict host, char **restrict user, char **restrict domain); int getnetgrent_r(char **restrict host, char **restrict user, char **restrict domain, char *restrict buf, size_t buflen); int innetgr(const char *netgroup, const char *host, const char *user, const char *domain); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setnetgrent(), endnetgrent(), getnetgrent(), getnetgrent_r(), innetgr(): Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE || _SVID_SOURCE DESCRIPTION The netgroup is a SunOS invention. A netgroup database is a list of string triples (hostname, username, domainname) or other netgroup names. Any of the eleβ ments in a triple can be empty, which means that anything matches. The functions described here allow access to the netgroup databases. The file /etc/nssβ witch.conf defines what database is searched. The setnetgrent() call defines the netgroup that will be searched by subsequent getnetgrent() calls. The getnetgrent() function retrieves the next netgroup enβ try, and returns pointers in host, user, domain. A null pointer means that the corresponding entry matches any string. The pointers are valid only as long as there is no call to other netgroup-related functions. To avoid this problem you can use the GNU function getnetgrent_r() that stores the strings in the supplied buffer. To free all allocated buffers use endnetgrent(). In most cases you want to check only if the triplet (hostname, username, domainname) is a member of a netgroup. The function innetgr() can be used for this without calling the above three functions. Again, a null pointer is a wildcard and matches any string. The function is thread-safe. RETURN VALUE These functions return 1 on success and 0 for failure. FILES /etc/netgroup /etc/nsswitch.conf ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βsetnetgrent(), getnetgrent_r(), innetgr() β Thread safety β MT-Unsafe race:netgrent locale β ββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βendnetgrent() β Thread safety β MT-Unsafe race:netgrent β ββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ€ βgetnetgrent() β Thread safety β MT-Unsafe race:netgrent race:netgrentbuf locale β ββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ In the above table, netgrent in race:netgrent signifies that if any of the functions setnetgrent(), getnetgrent_r(), innetgr(), getnetgrent(), or endnetgrent() are used in parallel in different threads of a program, then data races could occur. CONFORMING TO These functions are not in POSIX.1, but setnetgrent(), endnetgrent(), getnetgrent(), and innetgr() are available on most UNIX systems. getnetgrent_r() is not widely available on other systems. NOTES In the BSD implementation, setnetgrent() returns void. SEE ALSO sethostent(3), setprotoent(3), setservent(3) GNU 2021-03-22 SETNETGRENT(3)