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setresuid

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#define _GNU_SOURCE
#include <unistd.h>

int setresuid(uid_t ruid, uid_t euid, uid_t suid);
int setresgid(gid_t rgid, gid_t egid, gid_t sgid);

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getresuid(2), getuid(2), setfsuid(2), setfsgid(2), setreuid(2), setuid(2), capabilities(7), feature_test_macros(7)