49 lines
989 B
C
49 lines
989 B
C
#include <stdint.h>
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#include "sys.h"
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int main() {
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// Test the write syscall
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intptr_t n = write(STDIO, "Hello\n", 6);
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if(n != 6) return n;
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// Test the fork syscall
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uint64_t pid = fork();
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// Print the pid in hex
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char msg[17] = {' '};
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msg[16] = '\n';
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for(int i = 0; i < 16; ++i) {
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char nibble = (pid >> ((15 - i) * 4)) & 0xf;
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char c;
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if (nibble > 9) {c = nibble + '7';}
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else {c = nibble + '0';}
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msg[i] = c;
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}
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write(STDIO, msg, 17);
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// Child process exits
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if(pid == 0) return 0;
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//TODO: wait on child to remove zombie process
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#if defined(__x86_64__)
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// Test the read syscall
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#define INPUT_BUFFER_LEN 4096
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char input_buffer[INPUT_BUFFER_LEN] = {0};
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write(STDIO, "Enter some text:", 16);
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intptr_t n_read = read(STDIO, input_buffer, INPUT_BUFFER_LEN);
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write(STDIO, input_buffer, n_read);
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#endif
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return 69;
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}
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void __libc_start_main() {exit(main());}
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void _start() {
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__libc_start_main();
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}
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void __start() {
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_start();
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}
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