SETRESUID(2) BSD Programmer's Manual SETRESUID(2)
getresgid, getresuid, setresgid, setresuid - get or set real, effective and saved user or group ID
#include <sys/types.h> #include <unistd.h> int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid); int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid); int setresgid(gid_t rgid, gid_t egid, gid_t sgid); int setresuid(uid_t ruid, uid_t euid, uid_t suid);
The setresuid() function sets the real, effective and saved user IDs of the current process. The analogous setresgid() sets the real, effective and saved group IDs. Privileged processes may set these IDs to arbitrary values. Unprivileged processes are restricted in that each of the new IDs must match one of the current IDs. Passing -1 as an argument causes the corresponding value to remain un- changed. The getresgid() and getresuid() calls retrieve the real, effective, and saved group and user IDs of the current process, respectively.
Upon success, these functions return 0; otherwise -1 is returned.
[EPERM] The calling process was not privileged and tried to change one or more IDs to a value which was not the current real ID, the current effective ID nor the current saved ID. [EFAULT] An address passed to getresgid() or getresuid() was in- valid.
getegid(2), geteuid(2), getgid(2), getuid(2), issetugid(2), setgid(2), setregid(2), setreuid(2), setuid(2)
These functions are not part of the IEEE Std 1003.1 ("POSIX") specifica- tion. While they are not completely portable, they are the least ambigu- ous way to manage user and group IDs.
These functions first appeared in HP-UX. MirOS BSD #10-current October 20, 2002 1
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