| <head> |
| <title>acid(1) - Plan 9 from User Space</title> |
| <meta content="text/html; charset=utf-8" http-equiv=Content-Type> |
| </head> |
| <body bgcolor=#ffffff> |
| <table border=0 cellpadding=0 cellspacing=0 width=100%> |
| <tr height=10><td> |
| <tr><td width=20><td> |
| <tr><td width=20><td><b>ACID(1)</b><td align=right><b>ACID(1)</b> |
| <tr><td width=20><td colspan=2> |
| <br> |
| <p><font size=+1><b>NAME </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| acid, acidtypes – debugger<br> |
| |
| </table> |
| <p><font size=+1><b>SYNOPSIS </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>acid</font></tt> [ <tt><font size=+1>−l</font></tt> <i>library</i> ] [ <tt><font size=+1>−wq</font></tt> ] [ <tt><font size=+1>−m</font></tt> <i>machine</i> ] [ <i>pid</i> | <i>core</i> ] [ <i>textfile</i> |
| ] |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| <tt><font size=+1>acidtypes</font></tt> [ <tt><font size=+1>−p</font></tt> <i>prefix</i> ] <i>file</i> ...<br> |
| |
| </table> |
| <p><font size=+1><b>DESCRIPTION </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <i>Acid</i> is a programmable symbolic debugger. It can inspect one or |
| more processes that share an address space. A program to be debugged |
| may be specified by the process id of a running or defunct process, |
| or by the name of the program’s text file (<tt><font size=+1>a.out</font></tt> by default). |
| At the prompt, <i>acid</i> will store function definitions |
| or print the value of expressions. Options are<br> |
| <tt><font size=+1>−w</font></tt> Allow the textfile to be modified.<br> |
| <tt><font size=+1>−q</font></tt> Print variable renamings at startup.<br> |
| <tt><font size=+1>−l</font></tt> <i>library</i> Load from <i>library</i> at startup; see below.<br> |
| <tt><font size=+1>−m</font></tt> <i>machine</i> Assume instructions are for the given CPU type (see |
| <a href="../man3/mach.html"><i>mach</i>(3)</a>) instead of using the executable header to select the |
| CPU type.<br> |
| <tt><font size=+1>−k</font></tt> Debug the kernel state for the process, rather than the user |
| state. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| At startup, <i>acid</i> obtains standard function definitions from the |
| library file <tt><font size=+1>/usr/local/plan9/acid/port</font></tt>, architecture-dependent |
| functions from <tt><font size=+1>/usr/local/plan9/acid/$objtype</font></tt>, user-specified |
| functions from <tt><font size=+1>$home/lib/acid</font></tt>, and further functions from <tt><font size=+1>−l</font></tt> files. |
| Definitions in any file may |
| override previously defined functions. If the function <i>acidinit</i>() |
| is defined, it will be invoked after all modules have been loaded. |
| Then the function <i>acidmap</i>() will be invoked if defined. <tt><font size=+1>/usr/local/plan9/acid/port</font></tt> |
| provides a definition of <i>acidmap</i> that attaches all the shared |
| libraries being used by the target |
| process and then runs <i>acidtypes</i> (<i>q.v.</i>) to create <i>acid</i> functions |
| for examining data structures.<br> |
| <p><font size=+1><b>Language </b></font><br> |
| Symbols of the program being debugged become integer variables |
| whose values are addresses. Contents of addresses are obtained |
| by indirection. Local variables are qualified by function name, |
| for example <tt><font size=+1>main:argv</font></tt>. When program symbols conflict with <i>acid</i> |
| words, distinguishing <tt><font size=+1>$</font></tt> signs are prefixed. Such |
| renamings are reported at startup; option <tt><font size=+1>−q</font></tt> suppresses them. |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Variable types (<i>integer, float, list, string</i>) and formats are |
| inferred from assignments. Truth values false/true are attributed |
| to zero/nonzero integers or floats and to empty/nonempty lists |
| or strings. Lists are sequences of expressions surrounded by <tt><font size=+1>{}</font></tt> |
| and separated by commas. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Expressions are much as in C, but yield both a value and a format. |
| Casts to complex types are allowed. Lists admit the following |
| operators, with subscripts counted from 0.<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>head</font></tt> <i>list<br> |
| </i><tt><font size=+1>tail</font></tt> <i>list<br> |
| </i><tt><font size=+1>append</font></tt> <i>list</i><tt><font size=+1>,</font></tt> <i>element<br> |
| </i><tt><font size=+1>delete</font></tt> <i>list</i><tt><font size=+1>,</font></tt> <i>subscript |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| </i> |
| |
| </table> |
| Format codes are the same as in <a href="../man1/db.html"><i>db</i>(1)</a>. Formats may be attached |
| to (unary) expressions with <tt><font size=+1>\</font></tt>, e.g. <tt><font size=+1>(32*7)\D</font></tt>. There are two indirection |
| operators, <tt><font size=+1>*</font></tt> to address a core image, <tt><font size=+1>@</font></tt> to address a text file. |
| The type and format of the result are determined by the format |
| of the operand, whose type must be integer. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Statements are<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>if</font></tt> <i>expr</i> <tt><font size=+1>then</font></tt> <i>statement</i> [ <tt><font size=+1>else</font></tt> <i>statement</i> ]<br> |
| <tt><font size=+1>while</font></tt> <i>expr</i> <tt><font size=+1>do</font></tt> <i>statement<br> |
| </i><tt><font size=+1>loop</font></tt> <i>expr</i><tt><font size=+1>,</font></tt> <i>expr</i> <tt><font size=+1>do</font></tt> <i>statement<br> |
| </i><tt><font size=+1>defn</font></tt> <i>name</i><tt><font size=+1>(</font></tt><i>args</i><tt><font size=+1>) {</font></tt> <i>statement</i> <tt><font size=+1>}<br> |
| defn</font></tt> <i>name<br> |
| name</i><tt><font size=+1>(</font></tt><i>args</i><tt><font size=+1>)<br> |
| builtin</font></tt> <i>name</i><tt><font size=+1>(</font></tt><i>args</i><tt><font size=+1>)<br> |
| local</font></tt> <i>name<br> |
| </i><tt><font size=+1>return</font></tt> <i>expr<br> |
| </i><tt><font size=+1>whatis</font></tt> [ <i>name</i> ] |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| |
| </table> |
| The statement <tt><font size=+1>defn</font></tt> <i>name</i> clears the definition for <i>name</i>. A <tt><font size=+1>defn</font></tt> |
| may override a built-in function; prefixing a function call with |
| <tt><font size=+1>builtin</font></tt> ignores any overriding <tt><font size=+1>defn</font></tt>, forcing the use of the built-in |
| function. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Here is a partial list of functions; see the manual for a complete |
| list.<br> |
| <tt><font size=+1>stk()</font></tt> Print a stack trace for current process.<br> |
| <tt><font size=+1>lstk()</font></tt> Print a stack trace with values of local variables.<br> |
| <tt><font size=+1>gpr()</font></tt> Print general registers. Registers can also be accessed by |
| name, for example <tt><font size=+1>*R0</font></tt>.<br> |
| <tt><font size=+1>spr()</font></tt> Print special registers such as program counter and stack |
| pointer.<br> |
| <tt><font size=+1>fpr()</font></tt> Print floating-point registers.<br> |
| <tt><font size=+1>regs()</font></tt> Same as <tt><font size=+1>spr();gpr()</font></tt>.<br> |
| <tt><font size=+1>fmt(</font></tt><i>expr</i><tt><font size=+1>,</font></tt><i>format</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Expression <i>expr</i> with format given by the character value of expression |
| <i>format</i>.<br> |
| |
| </table> |
| |
| </table> |
| <tt><font size=+1>src(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Print 10 lines of source around the program address.<br> |
| <tt><font size=+1>Bsrc(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Get the source line for the program address into |
| a window of a running <a href="../man1/sam.html"><i>sam</i>(1)</a> and select it.<br> |
| <tt><font size=+1>line(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Print source line nearest to the program address.<br> |
| <tt><font size=+1>source()</font></tt> List current source directories.<br> |
| <tt><font size=+1>addsrcdir(</font></tt><i>string</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Add a source directory to the list.<br> |
| |
| </table> |
| |
| </table> |
| <tt><font size=+1>filepc(</font></tt><i>where</i><tt><font size=+1>)</font></tt> Convert a string of the form <i>sourcefile</i><tt><font size=+1>:</font></tt><i>linenumber</i> |
| to a machine address.<br> |
| <tt><font size=+1>pcfile(</font></tt><i>address</i><tt><font size=+1>)</font></tt>Convert a machine address to a source file name.<br> |
| <tt><font size=+1>pcline(</font></tt><i>address</i><tt><font size=+1>)</font></tt>Convert a machine address to a source line number.<br> |
| <tt><font size=+1>bptab()</font></tt> List breakpoints set in the current process.<br> |
| <tt><font size=+1>bpset(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Set a breakpoint in the current process at the given |
| address. (Doesn’t work on Unix yet.)<br> |
| <tt><font size=+1>bpdel(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Delete a breakpoint from the current process.<br> |
| <tt><font size=+1>cont()</font></tt> Continue execution of current process and wait for it to |
| stop.<br> |
| <tt><font size=+1>step()</font></tt> Execute a single machine instruction in the current process. |
| (Doesn’t work on Unix yet.)<br> |
| <tt><font size=+1>func()</font></tt> Step repeatedly until after a function return.<br> |
| <tt><font size=+1>stopped(</font></tt><i>pid</i><tt><font size=+1>)</font></tt> This replaceable function is called automatically |
| when the given process stops. It normally prints the program counter |
| and returns to the prompt.<br> |
| <tt><font size=+1>asm(</font></tt><i>address</i><tt><font size=+1>)</font></tt> Disassemble 30 machine instructions beginning at the |
| given address.<br> |
| <tt><font size=+1>mem(</font></tt><i>address</i><tt><font size=+1>,</font></tt><i>string</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Print a block of memory interpreted according to a string of format |
| codes.<br> |
| |
| </table> |
| |
| </table> |
| <tt><font size=+1>dump(</font></tt><i>address</i><tt><font size=+1>,</font></tt><i>n</i><tt><font size=+1>,</font></tt><i>string</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Like <tt><font size=+1>mem</font></tt>(), repeated for <i>n</i> consecutive blocks.<br> |
| |
| </table> |
| |
| </table> |
| <tt><font size=+1>print(</font></tt><i>expr</i><tt><font size=+1>,</font></tt><i>...</i><tt><font size=+1>)</font></tt> Print the values of the expressions.<br> |
| <tt><font size=+1>newproc(</font></tt><i>arguments</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Start a new process with arguments given as a string and halt |
| at the first instruction.<br> |
| |
| </table> |
| |
| </table> |
| <tt><font size=+1>new()</font></tt> Like <i>newproc</i>(), but take arguments (except <tt><font size=+1>argv[0]</font></tt>) from |
| string variable <tt><font size=+1>progargs</font></tt>.<br> |
| <tt><font size=+1>win()</font></tt> Like <i>new</i>(), but run the process in a separate window.<br> |
| <tt><font size=+1>start(</font></tt><i>pid</i><tt><font size=+1>)</font></tt> Start a stopped process.<br> |
| <tt><font size=+1>kill(</font></tt><i>pid</i><tt><font size=+1>)</font></tt> Kill the given process.<br> |
| <tt><font size=+1>setproc(</font></tt><i>pid</i><tt><font size=+1>)</font></tt> Make the given process current.<br> |
| <tt><font size=+1>rc(</font></tt><i>string</i><tt><font size=+1>)</font></tt> Escape to the shell, <a href="../man1/rc.html"><i>rc</i>(1)</a>, to execute the command string.<br> |
| <tt><font size=+1>include(</font></tt><i>string</i><tt><font size=+1>)</font></tt>Read acid commands from the named file.<br> |
| <tt><font size=+1>includepipe(</font></tt><i>string</i><tt><font size=+1>)<br> |
| </font></tt> |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Run the command string, reading its standard output as acid commands.<br> |
| |
| </table> |
| |
| </table> |
| <p><font size=+1><b>Shared library segments </b></font><br> |
| When a pid or core file is specified on the command line, <i>acid</i> |
| will, as part of its startup, determine the set of shared libraries |
| in use by the process image and map those at appropriate locations. |
| If <i>acid</i> is started without a pid or core file and is subsequently |
| attached to a process via <tt><font size=+1>setproc</font></tt>, the shared library maps |
| can be initialized by calling <tt><font size=+1>dynamicmap()</font></tt>.<br> |
| <p><font size=+1><b>Type information </b></font><br> |
| Unix compilers conventionally include detailed type information |
| in the debugging symbol section of binaries. The external program |
| <tt><font size=+1>acidtypes</font></tt> extracts this information and formats it as <i>acid</i> program |
| text. Once the shared libraries have been mapped, the default |
| <i>acid</i> startup invokes <tt><font size=+1>acidtypes</font></tt> (via |
| <tt><font size=+1>includepipe</font></tt>) on the set of currently mapped text files. The function |
| <tt><font size=+1>acidtypes()</font></tt> can be called to rerun the command after changing |
| the set of mapped text files.<br> |
| <p><font size=+1><b>Acid Libraries </b></font><br> |
| There are a number of <i>acid</i> ‘libraries’ that provide higher-level |
| debugging facilities. One notable example is <i>trump</i>, which uses |
| <i>acid</i> to trace memory allocation. <i>Trump</i> requires starting <i>acid</i> |
| on the program, either by attaching to a running process or by |
| executing <tt><font size=+1>new()</font></tt> on a binary (perhaps after setting <tt><font size=+1>progargs</font></tt>), |
| stopping the process, and then running <tt><font size=+1>trump()</font></tt> to execute the |
| program under the scaffolding. The output will be a trace of the |
| memory allocation and free calls executed by the program. When |
| finished tracing, stop the process and execute <tt><font size=+1>untrump()</font></tt> followed |
| by <tt><font size=+1>cont()</font></tt> to resume execution. |
| |
| </table> |
| <p><font size=+1><b>EXAMPLES </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| Start to debug <tt><font size=+1>/bin/ls</font></tt>; set some breakpoints; run up to the first |
| one (this example doesn’t work on Unix yet):<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>% acid /bin/ls<br> |
| /bin/ls: mips plan 9 executable<br> |
| /sys/lib/acid/port<br> |
| /sys/lib/acid/mips<br> |
| acid: new()<br> |
| 70094: system call _main ADD $−0x14,R29<br> |
| 70094: breakpoint main+0x4 MOVW R31,0x0(R29)<br> |
| acid: pid<br> |
| 70094<br> |
| acid: argv0 = **main:argv\s<br> |
| acid: whatis argv0<br> |
| integer variable format s<br> |
| acid: *argv0<br> |
| /bin/ls<br> |
| acid: bpset(ls)<br> |
| acid: cont()<br> |
| 70094: breakpoint ls ADD $−0x16c8,R29<br> |
| acid: <br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| </font></tt> |
| |
| </table> |
| Display elements of a linked list of structures:<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>complex Str { 'D' 0 val; 'X' 4 next; };<br> |
| s = *headstr;<br> |
| while s != 0 do{<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| complex Str s;<br> |
| print(s.val, "\n");<br> |
| s = s.next;<br> |
| |
| </table> |
| }<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| </font></tt> |
| |
| </table> |
| Note the use of the <tt><font size=+1>.</font></tt> operator instead of <tt><font size=+1>−></font></tt>. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Display an array of bytes declared in C as <tt><font size=+1>char array[]</font></tt>.<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>*(array\s)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| </font></tt> |
| |
| </table> |
| This example gives <tt><font size=+1>array</font></tt> string format, then prints the string |
| beginning at the address (in <i>acid</i> notation) <tt><font size=+1>*array</font></tt>. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Trace the system calls executed by <a href="../man1/ls.html"><i>ls</i>(1)</a> (neither does this one):<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>% acid −l truss /bin/ls<br> |
| /bin/ls:386 plan 9 executable<br> |
| /sys/lib/acid/port<br> |
| /sys/lib/acid/kernel<br> |
| /sys/lib/acid/truss<br> |
| /sys/lib/acid/386<br> |
| acid: progargs = "−l lib/profile"<br> |
| acid: new()<br> |
| acid: truss()<br> |
| open("#c/pid", 0)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 3<br> |
| |
| </table> |
| pread(3, 0x7fffeeac, 20, −1)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 12<br> |
| data: " 166 "<br> |
| |
| </table> |
| ...<br> |
| stat("lib/profile", 0x0000f8cc, 113)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 65<br> |
| |
| </table> |
| open("/env/timezone", 0)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 3<br> |
| |
| </table> |
| pread(3, 0x7fffd7c4, 1680, −1)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 1518<br> |
| data: "EST −18000 EDT −14400<br> |
| 9943200 25664400 41392800 57718800 73447200 89168400<br> |
| 104896800 ..."<br> |
| |
| </table> |
| close(3)<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 0<br> |
| |
| </table> |
| pwrite(1, "−−rw−rw−r−− M 9 rob rob 2519 Mar 22 10:29 lib/profile<br> |
| ", 54, −1)<br> |
| −−rw−rw−r−− M 9 rob rob 2519 Mar 22 10:29 lib/profile<br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| return value: 54<br> |
| |
| </table> |
| ...<br> |
| 166: breakpoint _exits+0x5 INTB $0x40<br> |
| acid: cont()<br> |
| </font></tt> |
| </table> |
| |
| </table> |
| <p><font size=+1><b>FILES </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>/usr/local/plan9/acid/$objtype<br> |
| /usr/local/plan9/acid/port<br> |
| /usr/local/plan9/acid/kernel<br> |
| /usr/local/plan9/acid/trump<br> |
| /usr/local/plan9/acid/truss<br> |
| $home/lib/acid<br> |
| </font></tt> |
| </table> |
| <p><font size=+1><b>SOURCE </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <tt><font size=+1>/usr/local/plan9/src/cmd/acid<br> |
| </font></tt> |
| </table> |
| <p><font size=+1><b>SEE ALSO </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| <a href="../man1/mk.html"><i>mk</i>(1)</a>, <a href="../man1/db.html"><i>db</i>(1)</a><br> |
| Phil Winterbottom, “Acid Manual”.<br> |
| |
| </table> |
| <p><font size=+1><b>DIAGNOSTICS </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| At termination, kill commands are proposed for processes that |
| are still active.<br> |
| |
| </table> |
| <p><font size=+1><b>BUGS </b></font><br> |
| |
| <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> |
| |
| There is no way to redirect the standard input and standard output |
| of a new process. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Source line selection near the beginning of a file may pick an |
| adjacent file. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| With the extant stepping commands, one cannot step through instructions |
| outside the text segment and it is hard to debug across process |
| forks. |
| <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> |
| |
| Breakpoints do not work yet. Therefore, commands such as <tt><font size=+1>step</font></tt>, |
| <tt><font size=+1>new</font></tt>, and <tt><font size=+1>truss</font></tt> do not work either. <tt><font size=+1>New</font></tt> in particular will need |
| some help to cope with dynamic libraries.<br> |
| |
| </table> |
| |
| <td width=20> |
| <tr height=20><td> |
| </table> |
| <!-- TRAILER --> |
| <table border=0 cellpadding=0 cellspacing=0 width=100%> |
| <tr height=15><td width=10><td><td width=10> |
| <tr><td><td> |
| <center> |
| <a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> |
| </center> |
| </table> |
| <!-- TRAILER --> |
| </body></html> |
