pw_nametoid, pw_idtoname, gr_nametoid, gr_idtoname - Map between user and group names and IDs (Enhanced Security)
Security Library (libsecurity.a)
#include <sys/types.h> #include <prot.h>
Specifies the user (pw_nametoid()) or group (gr_nametoid()) name. Specifies the user (pw_idtoname()) or group (gr_idtoname()) ID.
The mapping functions provide an efficient mapping between user and group names and identifiers (IDs). These functions maintain a separate binary database, which is automatically updated each time the functions encounter a changed /etc/passwd or /etc/group file. Also, these functions do not interfere with the behavior of the getpwent() and getgrent() functions, and are thus used by the protected password database functions, which must frequently convert between names and identifiers but may not disrupt an application's use of password mapping functions.
Programs using these functions must be compiled with -lsecurity.
Functions returning character strings return Null on failure, and a pointer to a string in an internal (that is, internal to the functions) memory area containing the user or group name on success. Functions returning integers return a nonnegative user or group ID on success, or a value of -1 on failure.
System password file. System group file.
Functions: getgrent(3), getprpwent(3), getpwent(3). delim off