您可以使用getgrgid()获取组名称并getpwuid()获取用户名:
#include <pwd.h>
#include <grp.h>
/* ... */
struct group *grp;
struct passwd *pwd;
grp = getgrgid(gid);
printf("group: %s\n", grp->gr_name);
pwd = getpwuid(uid);
printf("username: %s\n", pwd->pw_name);
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