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send_modem(): return value* success to return 0, fail to return with: * -1:open port error, * -2:write port error, * -3:open file failure, * -4:initial modem error, * -5:error dial command, * -6:enter data mode fail, * -7:read file error, * -8:communicate timeout, * -9:set SIGALARM error, * 1: no dialtone, * 2: busy, * 3: no carrier, * 4: no answer, * 5: not read finish file, * 6: sendfile is null. * 7: modem is in voice status.recv_modem():return valuesuccess to return 0, fail to return with:* success to return 0, fail to return with: * -1:open port error, * -2:write port error, * -3:creat file failure, * -4:initial modem error, * -5:have no request dial, * -6:Can't connect remote modem, * -7:read port error, * -8:communicate timeout, * -9:write file error, * 2:interrupt receive process, * 3:set SIGALRM error.
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