22 lines
497 B
C
22 lines
497 B
C
#include <lib.h>
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#define ptrace _ptrace
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#include <unistd.h>
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PUBLIC long ptrace(int req, pid_t pid, long addr, long data)
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{
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message m;
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m.m2_i1 = pid;
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m.m2_i2 = req;
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m.PMTRACE_ADDR = addr;
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m.m2_l2 = data;
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if (_syscall(MM, PTRACE, &m) < 0) return(-1);
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/* There was no error, but -1 is a legal return value. Clear errno if
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* necessary to distinguish this case. _syscall has set errno to nonzero
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* for the error case.
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*/
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if (m.m2_l2 == -1) errno = 0;
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return(m.m2_l2);
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}
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