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| [9] | 1 | #include <lib.h>
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| 2 | #define ptrace _ptrace
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| 3 | #include <unistd.h>
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| 4 |
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| 5 | PUBLIC long ptrace(req, pid, addr, data)
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| 6 | int req;
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| 7 | pid_t pid;
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| 8 | long addr;
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| 9 | long data;
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| 10 | {
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| 11 | message m;
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| 12 |
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| 13 | m.m2_i1 = pid;
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| 14 | m.m2_i2 = req;
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| 15 | m.m2_l1 = addr;
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| 16 | m.m2_l2 = data;
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| 17 | if (_syscall(MM, PTRACE, &m) < 0) return(-1);
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| 18 |
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| 19 | /* There was no error, but -1 is a legal return value. Clear errno if
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| 20 | * necessary to distinguish this case. _syscall has set errno to nonzero
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| 21 | * for the error case.
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| 22 | */
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| 23 | if (m.m2_l2 == -1) errno = 0;
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| 24 | return(m.m2_l2);
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| 25 | }
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