issetugid man page on OpenDarwin

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ISSETUGID(2)		    BSD System Calls Manual		  ISSETUGID(2)

NAME
     issetugid — is current executable running setuid or setgid

SYNOPSIS
     #include <unistd.h>

     int
     issetugid(void);

DESCRIPTION
     The issetugid() function returns 1 if the process was made setuid or set‐
     gid as the result of the last execve() system call.  Otherwise it returns
     0.

     This system call exists so that library routines (inside libc,
     libtermlib, or other libraries) can gaurantee safe behavior when used
     inside setuid or setgid programs.	Some library routines may not be
     passed sufficient information to know if the current program was started
     setuid or setgid because higher level calling code may have made changes
     to the uid or the euid.  In particular, it is wise to use this call to
     determine if a pathname returned from a getenv() call may safely be used
     to open() the specified file.

     issetugid() is unaffected by calls to setuid(), fork(), and other such
     calls.  It is only controlled by execve().

ERRORS
     The issetugid() function is always successful, and no return value is
     reserved to indicate an error.

SEE ALSO
     execve(2), setuid(2), seteuid(2,) setgid(2), setegid(2)

HISTORY
     A lstat() function call appeared in OpenBSD 2.0

OpenBSD 2.0			August, 25 1996			   OpenBSD 2.0
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