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    Command:

    keyctl_read

    
    
    

    SYNOPSIS

           #include <keyutils.h>
    
           long keyctl_read(key_serial_t key, char *buffer,
           size_tbuflen);
    
           long keyctl_read_alloc(key_serial_t key, char **_buffer);
    
    
    

    DESCRIPTION

           keyctl_read() reads the payload of a key if the key type supports it.
    
           The caller must have read permission on a key to be able to read it.
    
           buffer  and  buflen specify the buffer into which the payload data will
           be placed.  If the buffer is too small, the full size  of  the  payload
           will be returned, and no copy will take place.
    
           keyctl_read_alloc()  is  similar  to keyctl_read() except that it allo-
           cates a buffer big enough to hold the payload data and places the  data
           in  it.   If successful, A pointer to the buffer is placed in *_buffer.
           The caller must free the buffer.
    
    
    

    READING KEYRINGS

           This call can be used to list the contents of a keyring.  The  data  is
           presented to the user as an array of key_serial_t values, each of which
           corresponds to a key to which the keyring holds a link.
    
           The size of the keyring will be sizeof(key_serial_t) multiplied by  the
           number of keys.  The size of key_serial_t is invariant across different
           word sizes, though the byte-ordering is as appropriate for the  kernel.
    
    
    

    RETURN VALUE

           On  success  keyctl_read()  returns  the amount of data placed into the
           buffer.  If the buffer was too small, then the size of buffer  required
           will be returned, but no data will be transferred.  On error, the value
           -1 will be returned and errno will have  been  set  to  an  appropriate
           error.
    
           On  success  keyctl_read_alloc()  returns  the  amount  of  data in the
           buffer.  On error, the value -1 will be returned and  errno  will  have
           been set to an appropriate error.
    
    
    

    ERRORS

           ENOKEY The key specified is invalid.
    
           EKEYEXPIRED
                  The key specified has expired.
    
           EKEYREVOKED
                  The key specified had been revoked.
    
           EACCES The key exists, but is not readable by the calling process.
           request-key(8)
    
    
    

    Linux 4 May 2006 KEYCTL_READ(3)

    
    
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