getnetgrent_r - Linux

Overview

getnetgrent_r retrieves the next network group file entry. This function is a thread-safe version of getnetgrent.

Syntax

#include <netdb.h>

int getnetgrent_r(struct netgroup *result, char *buffer, size_t buflen, int *errnop);

Options/Flags

None.

Examples

#include <stdio.h>
#include <netdb.h>

int main() {
    int err;
    struct netgroup *netgroup;
    char buffer[1024];
    while ((netgroup = getnetgrent_r(buffer, sizeof(buffer), &err)) != NULL) {
         // Process netgroup
    }
    if (err == 0) {
        // No more netgroups
    } else {
        // Error occurred
    }
}

Common Issues

• getnetgrent_r may return NULL if there are no more entries in the network group file or if an error occurs while reading the file.
• The errnop parameter must be non-NULL.

Integration

getnetgrent_r can be used with other functions such as setnetgrent_r and endnetgrent_r to iterate through the network group file.

Related Commands

• getprotoent_r
• getservbyname
• getservbyport