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// poor emulation of SVR5 truss command - traces system calls
include("/sys/lib/acid/syscall");
_stoprunning = 0;
defn stopped(pid) {
local l;
local pc;
pc = *PC;
if notes then {
if (notes[0]!="sys: breakpoint") then
{
print(pid,": ",trapreason(),"\t");
print(fmt(pc,97),"\t",fmt(pc,105),"\n");
print("Notes pending:\n");
l = notes;
while l do
{
print("\t",head l,"\n");
l = tail l;
}
_stoprunning = 1;
}
}
}
defn _addressof(pattern) {
local s, l;
l = symbols;
pattern = "^\\$*"+pattern+"$";
while l do
{
s = head l;
if regexp(pattern, s[0]) && ((s[1] == 'T') || (s[1] == 'L')) then
return s[2];
l = tail l;
}
return 0;
}
stopPC = {};
readPC = {};
fd2pathPC = {};
errstrPC = {};
awaitPC = {};
_waitPC = {};
_errstrPC = {};
trusscalls = {
"sysr1",
"_errstr",
"bind",
"chdir",
"close",
"dup",
"alarm",
"exec",
"_exits",
"_fsession",
"fauth",
"_fstat",
"segbrk",
"_mount",
"open",
"_read",
"oseek",
"sleep",
"_stat",
"rfork",
"_write",
"pipe",
"create",
"fd2path",
"brk_",
"remove",
"_wstat",
"_fwstat",
"notify",
"noted",
"segattach",
"segdetach",
"segfree",
"segflush",
"rendezvous",
"unmount",
"_wait",
"seek",
"fversion",
"errstr",
"stat",
"fstat",
"wstat",
"fwstat",
"mount",
"await",
"pread",
"pwrite",
};
trussapecalls = {
"_SYSR1",
"__ERRSTR",
"_BIND",
"_CHDIR",
"_CLOSE",
"_DUP",
"_ALARM",
"_EXEC",
"_EXITS",
"__FSESSION",
"_FAUTH",
"__FSTAT",
"_SEGBRK",
"__MOUNT",
"_OPEN",
"__READ",
"_OSEEK",
"_SLEEP",
"__STAT",
"_RFORK",
"__WRITE",
"_PIPE",
"_CREATE",
"_FD2PATH",
"_BRK_",
"_REMOVE",
"__WSTAT",
"__FWSTAT",
"_NOTIFY",
"_NOTED",
"_SEGATTACH",
"_SEGDETACH",
"_SEGFREE",
"_SEGFLUSH",
"_RENDEZVOUS",
"_UNMOUNT",
"__WAIT",
"_SEEK",
"__NFVERSION",
"__NERRSTR",
"_STAT",
"__NFSTAT",
"__NWSTAT",
"__NFWSTAT",
"__NMOUNT",
"__NAWAIT",
"_PREAD",
"_PWRITE",
};
defn addressof(pattern) {
// translate to ape system calls if we have an ape binary
if _addressof("_EXITS") == 0 then
return _addressof(pattern);
return _addressof(trussapecalls[match(pattern, trusscalls)]);
}
defn setuptruss() {
local lst, offset, name, addr;
trussbpt = {};
offset = trapoffset();
lst = trusscalls;
while lst do
{
name = head lst;
lst = tail lst;
addr = addressof(name);
if addr then
{
bpset(addr+offset);
trussbpt = append trussbpt, (addr+offset);
// sometimes _exits is renamed $_exits
if(regexp("exits|exec", name)) then stopPC = append stopPC, (addr+offset);
if(regexp("read", name)) then readPC = append readPC, (addr+offset);
if(regexp("fd2path", name)) then fd2pathPC = append fd2pathPC, (addr+offset);
if(regexp("^\\$*await", name)) then awaitPC = append awaitPC, (addr+offset);
if(regexp("^\\$*errstr", name)) then errstrPC = append errstrPC, (addr+offset);
// compatibility hacks for old kernel
if(regexp("_wait", name)) then _waitPC = append _waitPC, (addr+offset);
if(regexp("_errstr", name)) then _errstrPC = append _errstrPC, (addr+offset);
}
}
}
defn trussflush() {
stop(pid); // already stopped, but flushes output
}
defn new() {
bplist = {};
newproc(progargs);
bpset(follow(main)[0]);
cont();
bpdel(*PC);
// clear the hang bit, which is left set by newproc, so programs we fork/exec don't hang
printto("/proc/"+itoa(pid)+"/ctl", "nohang");
}
defn truss() {
local pc, lst, offset, prevpc, pcspret, ret;
offset = trapoffset();
stop(pid);
_stoprunning = 0;
setuptruss();
pcspret = UPCSPRET();
while !_stoprunning do {
cont();
if notes[0]!="sys: breakpoint" then {
cleantruss();
return {};
}
pc = *PC;
if match(*PC, stopPC)>=0 then {
print(pid,": ",trapreason(),"\t");
print(fmt(pc,'a'),"\t",fmt(pc,'i'),"\n");
cleantruss();
return {};
}
if match(*PC, trussbpt)>=0 then {
usyscall();
trussflush();
prevpc = *PC;
step();
ret = eval pcspret[2];
print("\treturn value: ", ret\D, "\n");
if (ret>=0) && (match(prevpc, readPC)>=0) then {
print("\tdata: ");
printtextordata(*((eval pcspret[1])+4), ret);
print("\n");
}
if (ret>=0) && (match(prevpc, fd2pathPC)>=0) then {
print("\tdata: \"", *(*((eval pcspret[1])+4)\s), "\"\n");
}
if (ret>=0) && (match(prevpc, errstrPC)>=0) then {
print("\tdata: \"", *(*(eval pcspret[1])\s), "\"\n");
}
if (ret>=0) && (match(prevpc, awaitPC)>=0) then {
print("\tdata: ");
printtextordata(*(eval pcspret[1]), ret);
print("\n");
}
// compatibility hacks for old kernel:
if (ret>=0) && (match(prevpc, _waitPC)>=0) then {
print("\tdata: ");
printtextordata(*(eval pcspret[1]), 12+3*12+64);
print("\n");
}
if (ret>=0) && (match(prevpc, _errstrPC)>=0) then {
print("\tdata: ");
printtextordata(*(eval pcspret[1]), 64);
print("\n");
}
}
trussflush();
}
}
defn cleantruss() {
local lst, offset, addr;
stop(pid);
offset = trapoffset();
lst = trussbpt;
while lst do
{
addr = head lst;
lst = tail lst;
bpdel(addr);
}
trussbpt = {};
**PC = @*PC; // repair current instruction
}
defn untruss() {
cleantruss();
start(pid);
}
print("/sys/lib/acid/truss");