11-15-2011
There are small bits of any shared library which get altered slightly for each program it gets loaded in, to fix code offsets. So it's loaded in 'private' mode, where any changes that get set by your program are kept in RAM specific to that program.
This lets it share all the bits it doesn't change, but keep the bits it does change to itself. It's sort of like copy-on-write.
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LEARN ABOUT FREEBSD
setmode
SETMODE(3) BSD Library Functions Manual SETMODE(3)
NAME
getmode, setmode -- modify mode bits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
mode_t
getmode(const void *set, mode_t mode);
void *
setmode(const char *mode_str);
DESCRIPTION
The getmode() function returns a copy of the file permission bits mode as altered by the values pointed to by set. While only the mode bits
are altered, other parts of the file mode may be examined.
The setmode() function takes an absolute (octal) or symbolic value, as described in chmod(1), as an argument and returns a pointer to mode
values to be supplied to getmode(). Because some of the symbolic values are relative to the file creation mask, setmode() may call umask(2).
If this occurs, the file creation mask will be restored before setmode() returns. If the calling program changes the value of its file cre-
ation mask after calling setmode(), setmode() must be called again if getmode() is to modify future file modes correctly.
If the mode passed to setmode() is invalid or if memory cannot be allocated for the return value, setmode() returns NULL.
The value returned from setmode() is obtained from malloc() and should be returned to the system with free() when the program is done with
it, generally after a call to getmode().
ERRORS
The setmode() function may fail and set errno for any of the errors specified for the library routine malloc(3).
SEE ALSO
chmod(1), stat(2), umask(2), malloc(3)
HISTORY
The getmode() and setmode() functions first appeared in 4.4BSD.
BSD
April 28, 1995 BSD