40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
// Test Conversation between parent and child environment
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// Contributed by Varun Agrawal at Stony Brook
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#include <inc/lib.h>
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const char *str1 = "hello child environment! how are you?";
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const char *str2 = "hello parent environment! I'm good.";
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#define TEMP_ADDR ((char*)0xa00000)
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#define TEMP_ADDR_CHILD ((char*)0xb00000)
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void
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umain(int argc, char **argv)
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{
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envid_t who;
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if ((who = fork()) == 0) {
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// Child
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ipc_recv(&who, TEMP_ADDR_CHILD, 0);
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cprintf("%x got message: %s\n", who, TEMP_ADDR_CHILD);
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if (strncmp(TEMP_ADDR_CHILD, str1, strlen(str1)) == 0)
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cprintf("child received correct message\n");
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memcpy(TEMP_ADDR_CHILD, str2, strlen(str2) + 1);
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ipc_send(who, 0, TEMP_ADDR_CHILD, PTE_P | PTE_W | PTE_U);
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return;
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}
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// Parent
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sys_page_alloc(thisenv->env_id, TEMP_ADDR, PTE_P | PTE_W | PTE_U);
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memcpy(TEMP_ADDR, str1, strlen(str1) + 1);
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ipc_send(who, 0, TEMP_ADDR, PTE_P | PTE_W | PTE_U);
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ipc_recv(&who, TEMP_ADDR, 0);
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cprintf("%x got message: %s\n", who, TEMP_ADDR);
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if (strncmp(TEMP_ADDR, str2, strlen(str2)) == 0)
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cprintf("parent received correct message\n");
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return;
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}
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