DragonFly On-Line Manual Pages

STORE(9)              DragonFly Kernel Developer's Manual             STORE(9)

NAME
     store, casu32, casu64, subyte, suword32, suword64 -- store data to user-
     space

SYNOPSIS
     #include <sys/types.h>
     #include <sys/time.h>
     #include <sys/systm.h>
     #include <sys/resourcevar.h>

     uint32_t
     casu32(volatile uint32_t *p, uint32_t oldval, uint32_t newval);

     uint64_t
     casu64(volatile uint64_t *p, uint64_t oldval, uint64_t newval);

     int
     subyte(uint8_t *base, uint8_t byte);

     int
     suword32(uint32_t *base, int word);

     int
     suword64(uint64_t *base, uint64_t word);

DESCRIPTION
     The store functions are designed to copy small amounts of data to user-
     space.

     The store routines provide the following functionality:

     casu32()    Compares the 32 bit oldval with the 32 bits at base, and if
                 equal, base is set to newval.  The old value at base is then
                 returned.

     casu64()    Compares the 64 bit oldval with the 64 bits at base, and if
                 equal, base is set to newval.  The old value at base is then
                 returned.

     subyte()    Stores a byte of data to the user-space address base.

     suword32()  Stores 32 bits of data to the user-space address base.

     suword64()  Stores 64 bits of data to the user-space address base.

RETURN VALUES
     The store functions return 0 on success or -1 on failure.

SEE ALSO
     copy(9), fetch(9)

DragonFly 4.7                  January 26, 2017                  DragonFly 4.7