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System Calls issetugid(2)
NAME
issetugid - determine if current executable is running
setuid or setgid
SYNOPSIS
#include <unistd.h>
int issetugid(void);
DESCRIPTION
The issetugid() function enables library functions (in lib-
termlib, libc, or other libraries) to guarantee safe
behavior when used in setuid or setgid programs or programs
that run with more privileges after a succesful exec(2).
Some library functions might be passed insufficient informa-
tion and not know whether the current program was started
setuid or setgid because a higher level calling code might
have made changes to the uid, euid, gid, or egid. These
low-level library functions are therefore unable to deter-
mine if they are being run with elevated or normal
privileges.
The issetugid() function should be used to determine if a
path name returned from a getenv(3C) call can be used safely
to open the specified file. It is often not safe to open
such a file because the status of the effective uid is not
known.
The result of a call to issetugid() is unaffected by calls
to setuid(), setgid(), or other such calls. In case of a
call to fork(2), the child process inherits the same status.
The status of issetugid() is affected only by execve() (see
exec(2)). If a child process executes a new executable file,
a new issetugid() status will be based on the existing
process's uid, euid, gid, and egid permissions and on the
modes of the executable file. If the new executable file
modes are setuid or setgid, or if the existing process is
executing the new image with uid != euid or gid != egid, or
if the permitted set before the call to the exec function is
not a superset of the inheritable set at that time, issetu-
gid() returns 1 in the new process.
RETURN VALUES
The issetugid() function returns 1 if the process was made
setuid or setgid as the result of the last or a previous
call to execve(). Otherwise it returns 0.
ERRORS
The issetugid() function is always successful. No return
value is reserved to indicate an error.
SunOS 5.10 Last change: 19 Feb 2003 1
System Calls issetugid(2)
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Evolving |
|_____________________________|_____________________________|
| MT-Level | Async-Signal-Safe |
|_____________________________|_____________________________|
SEE ALSO
exec(2), fork(2), setuid(2), getenv(3C), attributes(5),
privileges(5)
SunOS 5.10 Last change: 19 Feb 2003 2
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This page was generated on Wed Sep 12 11:27:01 GMT 2007
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