GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.1 |
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setresgid(2) |
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setresuid, setresgid − set real, effective and saved user or group ID
#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);
setresuid() sets the real user ID, the effective user ID, and the saved set-user-ID of the current process.
Unprivileged user processes may change the real UID, effective UID, and saved set-user-ID, each to one of: the current real UID, the current effective UID or the current saved set-user-ID.
Privileged processes (on Linux, those having the CAP_SETUID capability) may set the real UID, effective UID, and saved set-user-ID to arbitrary values.
If one of the parameters equals −1, the corresponding value is not changed.
Regardless of what changes are made to the real UID, effective UID, and saved set-user-ID, the file system UID is always set to the same value as the (possibly new) effective UID.
Completely analogously, setresgid() sets the real GID, effective GID, and saved set-group-ID of the current process (and always modifies the file system GID to be the same as the effective GID), with the same restrictions for non-privileged processes.
On success, zero is returned. On error, −1 is returned, and errno is set appropriately.
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EAGAIN |
uid does not match the current UID and this call would bring that user ID over its NPROC rlimit. | ||
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EPERM |
The calling process is not privileged (did not have the CAP_SETUID capability) and tried to change the IDs to values that are not permitted. |
These calls are non-standard; they also appear on HP-UX and some of the BSDs.
This system call was first introduced in HP-UX. It is available under Linux since Linux 2.1.44. These days it is also found in FreeBSD (for emulation of Linux binaries).
Under HP-UX and FreeBSD the prototype is found in <unistd.h>. Under Linux the prototype is given by glibc since version 2.3.2 provided _GNU_SOURCE is defined.
getresuid(2), getuid(2), setfsuid(2), setfsgid(2), setreuid(2), setuid(2), capabilities(7)
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setresgid(2) | |