56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#include <sys/types.h>
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#include <stdint.h>
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#include <syscall.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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DEFN_SYSCALL2(shm_obtain, 35, char *, size_t *)
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#define KEY "shm_test3.mem"
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#define MAGIC 111
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int client_proc(uint32_t size) {
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volatile unsigned char * mem = (volatile unsigned char *)syscall_shm_obtain(KEY, &size);
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while (mem[0] != MAGIC) {}
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mem[0] = (uint8_t)(MAGIC + 1);
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for (uint32_t i = 1; i < size; i++) {
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if (mem[i] != (unsigned char)i) {
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printf("Verification at 0x%x (i=%d) failed; expected=%d got=%d\n", &mem[i], i, (uint8_t)i, mem[i]);
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return 1;
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}
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}
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printf("Client: verification passed. Exiting.\n");
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return 0;
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}
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int server_proc(uint32_t size) {
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volatile unsigned char * mem = (volatile unsigned char *)syscall_shm_obtain(KEY, &size);
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for (uint32_t i = 1; i < size; i++) {
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mem[i] = (unsigned char)i;
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}
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mem[0] = MAGIC;
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printf("Server: Written memory space.\n");
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while (mem[0] == MAGIC) {}
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return 0;
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}
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int main (int argc, char ** argv) {
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if (argc < 2) {
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printf("usage: %s [size]\n", argv[0]);
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}
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int size = atoi(argv[1]);
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if (!fork()) {
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return server_proc(size);
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} else {
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return client_proc(size);
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}
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}
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