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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
#include <unistd.h>
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#include <stdio.h>
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#include <pwd.h>
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#include <grp.h>
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#include <alloca.h>
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extern "C" int main(int, char**);
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int main(int argc, char** argv)
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{
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(void) argc;
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(void) argv;
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uid_t uid = getuid();
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gid_t gid = getgid();
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struct passwd* pw = getpwuid(uid);
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struct group* gr = getgrgid(gid);
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printf("uid=%u(%s), gid=%u(%s)", uid, pw ? pw->pw_name : "n/a", gid, gr ? gr->gr_name : "n/a");
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int extra_gid_count = getgroups(0, nullptr);
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if (extra_gid_count) {
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auto* extra_gids = (gid_t*)alloca(extra_gid_count * sizeof(gid_t));
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int rc = getgroups(extra_gid_count, extra_gids);
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if (rc < 0) {
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perror("\ngetgroups");
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return 1;
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}
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printf(", groups=");
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for (int g = 0; g < extra_gid_count; ++g) {
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auto* gr = getgrgid(extra_gids[g]);
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if (gr)
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printf("%u(%s)", extra_gids[g], gr->gr_name);
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else
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printf("%u", extra_gids[g]);
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if (g != extra_gid_count - 1)
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printf(",");
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}
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}
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printf("\n");
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return 0;
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}
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