setnetgrent - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

---

NAMEsetnetgrent, endnetgrent, getnetgrent, getnetgrent_r, innetgr − handle network group entries

---

LIBRARYStandard C library (libc, −lc)

---

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 buf[restrict .buflen], 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

---

DESCRIPTIONThe netgroup is a SunOS invention. A netgroup database is a list of string triples (hostname, username, domainname) or other netgroup names. Any of the elements in a triple can be empty, which means that anything matches. The functions described here allow access to the netgroup databases. The file /etc/nsswitch.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 entry, 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 VALUEThese functions return 1 on success and 0 for failure.

---

FILES/etc/netgroup
/etc/nsswitch.conf

---

ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue setnetgrent(), getnetgrent_r(), innetgr() Thread safety MT-Unsafe race:netgrent locale endnetgrent() Thread safety MT-Unsafe race:netgrent getnetgrent() Thread safety MT-Unsafe race:netgrent race:netgrentbuf locale 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.

---

STANDARDSThese 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.

---

NOTESIn the BSD implementation, setnetgrent() returns void.

---

SEE ALSOsethostent(3), setprotoent(3), setservent(3) 0

---

Johanes Gumabo

---

Data Size   :   14,010 byte
man-endnetgrent.3Build   :   2024-12-29, 07:25   :  
Visitor Screen   :   x
Visitor Counter ( page / site )   :   3 / 261,804
Visitor ID   :     :  
Visitor IP   :   13.59.36.4   :  
Visitor Provider   :   AMAZON-02   :  
Provider Position ( lat x lon )   :   39.962500 x -83.006100   :   x
Provider Accuracy Radius ( km )   :   1000   :  
Provider City   :   Columbus   :  
Provider Province   :   Ohio ,   :   ,
Provider Country   :   United States   :  
Provider Continent   :   North America   :  
Visitor Recorder   :   Version   :  
Visitor Recorder   :   Library   :  
Online Linux Manual Page   :   Version   :   Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.29
Online Linux Manual Page   :   Library   :   lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Online Linux Manual Page   :   Library   :   lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Data Base   :   Version   :   Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38
Data Base   :   Library   :   lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36

---

Very long time ago, I have the best tutor, Wenzel Svojanovsky . If someone knows the email address of Wenzel Svojanovsky , please send an email to johanes_gumabo@yahoo.co.id .

---

If error, please print screen and send to johanes_gumabo@yahoo.co.id
Under development. Support me via PayPal.

---