C語(yǔ)言fgetgrent()函數(shù)：讀取組格式函數(shù)
頭文件：
#include <grp.h> #include <stdio.h> #include <sys/types.h>
定義函數(shù)：
struct group * getgrent(FILE * stream);
函數(shù)說(shuō)明：fgetgrent()會(huì)從參數(shù)stream 指定的文件讀取一行數(shù)據(jù), 然后以group 結(jié)構(gòu)將該數(shù)據(jù)返回. 參數(shù)stream 所指定的文件必須和、etc/group 相同的格式. group 結(jié)構(gòu)定義請(qǐng)參考getgrent().
返回值：返回 group 結(jié)構(gòu)數(shù)據(jù), 如果返回NULL 則表示已無(wú)數(shù)據(jù), 或有錯(cuò)誤發(fā)生.
范例
#include <grp.h>#include <sys/types.h>#include <stdio.h>main(){ struct group *data; FILE *stream; int i; stream = fopen("/etc/group", "r"); while((data = fgetgrent(stream)) != 0) { i = 0; printf("%s :%s:%d :", data->gr_name, data->gr_passwd, data->gr_gid); while(data->gr_mem[i]) printf("%s, ", data->gr_mem[i++]); printf("/n"); } fclose(stream);}執(zhí)行：
root:x:0:root,bin:x:1:root, bin, daemondaemon:x:2:root, bin, daemonsys:x:3:root, bin, admadm:x:4:root, adm, daemontty:x:5disk:x:6:rootlp:x:7:daemon, lpmem:x:8kmem:x:9wheel:x:10:rootmail:x:12:mailnews:x:13:newsuucp:x:14:uucpman:x:15games:x:20gopher:x:30dip:x:40:ftp:x:50nobody:x:99:
C語(yǔ)言fgetpwent()函數(shù)：讀取密碼格式
頭文件：
#include <pwd.h> #include <stdio.h> #include <sys/types.h>
定義函數(shù)：
struct passwd * fgetpwent(FILE * stream);
函數(shù)說(shuō)明：fgetpwent()會(huì)從參數(shù)stream 指定的文件讀取一行數(shù)據(jù), 然后以passwd 結(jié)構(gòu)將該數(shù)據(jù)返回. 參數(shù)stream 所指定的文件必須和/etc/passwd 相同的格式. passwd 結(jié)構(gòu)定義請(qǐng)參考getpwent().
返回值：返回 passwd 結(jié)構(gòu)數(shù)據(jù), 如果返回NULL 則表示已無(wú)數(shù)據(jù), 或有錯(cuò)誤發(fā)生.
范例
#include <pwd.h>#include <sys/types.h>main(){ struct passwd *user; FILE *stream; stream = fopen("/etc/passwd", "r"); while((user = fgetpwent(stream)) != 0) { printf("%s:%d:%d:%s:%s:%s/n", user->pw_name, user->pw_uid, user->pw_gid, user->pw_gecos, user->pw_dir, user->pw_shell); }}執(zhí)行：
root:0:0:root:/root:/bin/bashbin:1:1:bin:/bin:daemon:2:2:daemon:/sbin:adm:3:4:adm:/var/adm:lp:4:7:lp:/var/spool/lpd:sync:5:0:sync:/sbin:/bin/syncshutdown:6:0:shutdown:/sbin:/sbin/shutdownhalt:7:0:halt:/sbin:/sbin/haltmail:8:12:mail:/var/spool/mail:news:9:13:news:var/spool/newsuucp:10:14:uucp:/var/spool/uucp:operator:11:0:operator :/root:games:12:100:games:/usr/games:gopher:13:30:gopher:/usr/lib/gopher-data:ftp:14:50:FTP User:/home/ftp:nobody:99:99:Nobody:/:xfs:100:101:X Font Server: /etc/Xll/fs:/bin/falsegdm:42:42:/home/gdm:/bin/bashkids:500:500: : /home/kids:/bin/bash
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