| PW_DUP(3) |
AerieBSD 1.0 Refernce Manual |
PW_DUP(3) |
NAME
pw_dup —
make a copy of a struct passwd
SYNOPSIS
#include <pwd.h>
structpasswd *
pw_dup(const struct passwd *pw);
DESCRIPTION
The
pw_dup();
function allocates sufficient memory for a copy of the struct passwd
pw,
does the copy, and returns a pointer to it.
This is useful as subsequent calls to
getpwent();,
getpwnam();,
and
getpwuid();
will overwrite the data they returned from previous calls.
The returned pointer may be deallocated by a single call to
free(3).
Since
pw_dup();
allocates space for the copy in one chunk, it is not necessary to free
the individual strings contained in the returned struct passwd.
If insufficient memory is available,
NULL
is returned.
EXAMPLES
The following will make a copy of the struct passwd for root and
store it in
"pw_save":
struct passwd *pw, *pw_save;
if ((pw = getpwnam("root")) == NULL) {
fprintf(stderr, "Cannot find root in the password file.\en");
exit(1);
}
if ((pw_save = pw_dup(pw)) == NULL) {
fprintf(stderr, "Out of memory.\en");
exit(1);
}
ERRORS
pw_dup();
function may fail and set the external variable
errno
for any of the errors specified for the library function
malloc(3).
SEE ALSO
free(3),
getpwent(3),
malloc(3)
HISTORY
The
pw_dup();
function first appeared in
OpenBSD 2.9.
| AerieBSD 1.0 Reference Manual |
August 26 2008 |
PW_DUP(3) |