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Improved NOTIFY system: fixed a minor error, ignore pending notifications

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on SENDREC system calls. To be done: resource (buffer pool) management;
make it structurally impossible to run out of buffers.
This commit is contained in:
Jorrit Herder
2005-05-27 12:44:14 +00:00
parent 77c3213948
commit c2be104821
11 changed files with 110 additions and 102 deletions
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6
include/minix/com.h
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@@ -5,12 +5,14 @@
/* Masks and flags for system calls. */
#define SYSCALL_FUNC 0x0F /* mask for system call function */
#define SYSCALL_FLAGS 0xF0 /* mask for system call flags */
#define NON_BLOCKING 0x10 /* don't block, but return */
#define NON_BLOCKING 0x10 /* prevent blocking, return error */
#define FRESH_ANSWER 0x20 /* ignore pending notifications as answer */
/* default behaviour for SENDREC calls */
/* System calls (numbers passed when trapping to the kernel) */
#define SEND 1 /* function code for sending messages */
#define RECEIVE 2 /* function code for receiving messages */
#define BOTH 3 /* function code for SEND + RECEIVE */
#define SENDREC 3 /* function code for SEND + RECEIVE */
#define NOTIFY 4 /* function code for notifications */
#define NB_SEND (SEND | NON_BLOCKING) /* non-blocking SEND */
#define NB_RECEIVE (RECEIVE | NON_BLOCKING) /* non-blocking RECEIVE */