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pw_mapping(3)
NAME
  pw_nametoid, pw_idtoname, gr_nametoid, gr_idtoname - Map between user and
  group names and IDs (Enhanced Security)

SYNOPSIS
  #include <sys/types.h>
  #include <prot.h>

  uid_t pw_nametoid(
	  char *name );

  char *pw_idtoname(
	  uid_t id );

  gid_t gr_nametoid(
	  char *name );

  char *gr_idtoname(
	  gid_t id );

LIBRARY
  Enhanced Security Library (libsecurity)

PARAMETERS
  name
      Specifies the user (pw_nametoid()) or group (gr_nametoid()) name.

  id  Specifies the user (pw_idtoname()) or group (gr_idtoname()) ID.

DESCRIPTION
  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.

NOTES
  Programs using these functions must be compiled with -lsecurity.

RETURN VALUES
  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.

FILES
  /etc/passwd
      System password file.

  /etc/group
      System group file.

SEE ALSO
  Functions: getgrent(3), getprpwent(3), getpwent(3)

Index for Section 3

Alphabetical listing for P

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