70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
#include <inc/lib.h>
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struct {
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char msg1[5000];
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char msg2[1000];
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} data = {
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"this is initialized data",
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"so is this"
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};
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char bss[6000];
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int
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sum(const char *s, int n)
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{
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int i, tot = 0;
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for (i = 0; i < n; i++)
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tot ^= i * s[i];
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return tot;
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}
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void
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umain(int argc, char **argv)
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{
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int i, r, x, want;
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char args[256];
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cprintf("init: running\n");
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want = 0xf989e;
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if ((x = sum((char*)&data, sizeof data)) != want)
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cprintf("init: data is not initialized: got sum %08x wanted %08x\n",
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x, want);
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else
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cprintf("init: data seems okay\n");
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if ((x = sum(bss, sizeof bss)) != 0)
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cprintf("bss is not initialized: wanted sum 0 got %08x\n", x);
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else
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cprintf("init: bss seems okay\n");
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// output in one syscall per line to avoid output interleaving
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strcat(args, "init: args:");
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for (i = 0; i < argc; i++) {
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strcat(args, " '");
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strcat(args, argv[i]);
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strcat(args, "'");
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}
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cprintf("%s\n", args);
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cprintf("init: running sh\n");
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// being run directly from kernel, so no file descriptors open yet
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close(0);
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if ((r = opencons()) < 0)
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panic("opencons: %e", r);
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if (r != 0)
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panic("first opencons used fd %d", r);
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if ((r = dup(0, 1)) < 0)
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panic("dup: %e", r);
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while (1) {
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cprintf("init: starting sh\n");
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r = spawnl("/sh", "sh", (char*)0);
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if (r < 0) {
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cprintf("init: spawn sh: %e\n", r);
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continue;
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}
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wait(r);
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}
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}
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