1#define _GNU_SOURCE 2#include <grp.h> 3#include <stdio.h> 4 5int putgrent(const struct group *gr, FILE *f) 6{ 7 int r; 8 size_t i; 9 flockfile(f); 10 if ((r = fprintf(f, "%s:%s:%d:", gr->gr_name, gr->gr_passwd, gr->gr_gid))<0) goto done; 11 if (gr->gr_mem) for (i=0; gr->gr_mem[i]; i++) 12 if ((r = fprintf(f, "%s%s", i?",":"", gr->gr_mem[i]))<0) goto done; 13 r = fputc('\n', f); 14done: 15 funlockfile(f); 16 return r<0 ? -1 : 0; 17} 18