eth_rec() is called from the main loop or by eth_get_stat() or by eth_set_rec_conf() upon receipt of a message from the ethernet task. If the message is valid, the message will either indicate that a write operation has successfully ended (in which case, write_int() is called) or that the ethernet task has received a packet (in which case, read_int() is called).
The message (which is of type mess_2) has the following structure:From dp8390.c:
*
* m-type DL_PORT DL_PROC DL_COUNT DL_STAT DL_CLCK
* |------------|----------|---------|----------|---------|---------|
* |DL_TASK_REPL| port nr | proc nr | rd-count | err|stat| clock |
* |------------|----------|---------|----------|---------|---------|
*
From include/minix/type.h:
typedef struct {
int m_source; /* who sent the message */
int m_type; /* what kind of message is it */
union {
mess_1 m_m1;
mess_2 m_m2;
mess_3 m_m3;
mess_4 m_m4;
mess_5 m_m5;
mess_6 m_m6;
} m_u;
} message;
typedef struct {int m2i1, m2i2, m2i3; long m2l1, m2l2; char *m2p1;} mess_2;
From include/minix/com.h:
# define DL_PORT m2_i1
# define DL_PROC m2_i2
# define DL_COUNT m2_i3
# define DL_CLCK m2_l2
# define DL_STAT m2_l1
