source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/linux/ptrace.c@ 337

#include <sys/ptrace.h>
#include <stdarg.h>
#include <unistd.h>
#include "syscall.h"

long ptrace(int req, ...)
{
        va_list ap;
        pid_t pid;
        void *addr, *data, *addr2 = 0;
        long ret, result;

        va_start(ap, req);
        pid = va_arg(ap, pid_t);
        addr = va_arg(ap, void *);
        data = va_arg(ap, void *);
        /* PTRACE_{READ,WRITE}{DATA,TEXT} (16...19) are specific to SPARC. */
#ifdef PTRACE_READDATA
        if ((unsigned)req - PTRACE_READDATA < 4)
                addr2 = va_arg(ap, void *);
#endif
        va_end(ap);

        if (req-1U < 3) data = &result;
        ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);

        if (ret < 0 || req-1U >= 3) return ret;
        return result;
}