71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
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/* See LICENSE file for copyright and license details. */
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#include <sys/types.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <grp.h>
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#include <stdio.h>
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#include <limits.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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struct passwd *pw;
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struct group *gr;
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uid_t uid, euid;
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gid_t gid, egid, groups[NGROUPS_MAX];
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int ngroups;
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int i;
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ARGBEGIN {
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default:
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usage();
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} ARGEND;
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/* Print uid/euid info */
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uid = getuid();
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printf("uid=%u", uid);
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if (!(pw = getpwuid(uid)))
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eprintf("getpwuid:");
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printf("(%s)", pw->pw_name);
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if ((euid = geteuid()) != uid) {
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printf(" euid=%u", euid);
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if (!(pw = getpwuid(euid)))
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eprintf("getpwuid:");
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printf("(%s)", pw->pw_name);
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}
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/* Print gid/egid info */
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gid = getgid();
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printf(" gid=%u", gid);
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if (!(gr = getgrgid(gid)))
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eprintf("getgrgid:");
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printf("(%s)", gr->gr_name);
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if ((egid = getegid()) != gid) {
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printf(" egid=%u", egid);
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if (!(gr = getgrgid(egid)))
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eprintf("getgrgid:");
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printf("(%s)", gr->gr_name);
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}
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/* Print groups */
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ngroups = getgroups(NGROUPS_MAX, groups);
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if (ngroups < 0)
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eprintf("getgroups:");
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for (i = 0; i < ngroups; i++) {
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gid = groups[i];
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printf("%s%u", !i ? " groups=" : ",", gid);
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if (!(gr = getgrgid(gid)))
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eprintf("getgrgid:");
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printf("(%s)", gr->gr_name);
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}
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putchar('\n');
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return 0;
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}
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