8b4e2a08fe
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
56 lines
910 B
C
56 lines
910 B
C
// simple fork and pipe read/write
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char buf[2048];
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void
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pipe1()
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{
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int fds[2], pid;
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int seq = 0, i, n, cc, total;
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pipe(fds);
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pid = fork();
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if(pid == 0){
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close(fds[0]);
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for(n = 0; n < 5; n++){
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for(i = 0; i < 1033; i++)
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buf[i] = seq++;
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if(write(fds[1], buf, 1033) != 1033){
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puts("pipe1 oops 1\n");
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exit(1);
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}
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}
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exit(0);
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} else {
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close(fds[1]);
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total = 0;
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cc = 1;
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while(1){
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n = read(fds[0], buf, cc);
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if(n < 1)
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break;
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for(i = 0; i < n; i++){
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if((buf[i] & 0xff) != (seq++ & 0xff)){
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puts("pipe1 oops 2\n");
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return;
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}
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}
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total += n;
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cc = cc * 2;
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if(cc > sizeof(buf))
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cc = sizeof(buf);
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}
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if(total != 5 * 1033)
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puts("pipe1 oops 3\n");
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close(fds[0]);
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}
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puts("pipe1 ok\n");
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}
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main()
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{
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pipe1();
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while(1)
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;
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}
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