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Trouble with getting syscalls with own python debugger


By : Doug Pinkston
Date : August 02 2020, 06:00 AM
Any of those help If you're only looking for int 0x80, you're going to miss normal 32-bit syscalls made with the sysenter instruction (normally via glibc calling into the VDSO page). https://blog.packagecloud.io/eng/2016/04/05/the-definitive-guide-to-linux-system-calls/. (Also on old AMD CPUs, 32-bit syscall is also possible, and might be used by default if they're too old to support sysenter.)
I guess the early ld.so code uses the legacy int 0x80 mechanism instead of calling into the VDSO. (Which makes sense; the VDSO presents itself as an ELF shared object mapped into memory; until the dynamic linker sets up function-pointers into it, it can't use it.)
code :


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Trouble and frustration with the Android debugger


By : christian valadez
Date : March 29 2020, 07:55 AM
may help you . The line will always be printed in the logcat. Just hit run until it stops breaking, and check the logfile. It gives the complete stack trace there.
Ok, I'm going to be the geeezer jerk for a minute. A debugger is a crutch. Your first reaction as a programmer should always be to check the log file. The log file will generally give context, and you won't always be able to run a debugger (you're running on an interrupt, the code is running on a remote machine you don't have access to, the code is running a language that doesn't have exceptions, the crash is a hard crash and brings down the computer, etc). Checking the debugger should be step 3 or 4, not step 1.

Why Python splits read function into multiple syscalls?


By : Miguel Figueiredo
Date : March 29 2020, 07:55 AM
I wish this help you I did some research on exactly why this happens.
Note: I did my tests with Python 3.5. Python 2 has a different I/O system with the same quirk for a similar reason, but this was easier to understand with the new IO system in Python 3.
code :
fp = open('/dev/urandom', 'rb')
fp = fp.detach()
ans = fp.read(65600)
fp.close()
read(3, "]\"\34\277V\21\223$l\361\234\16:\306V\323\266M\215\331\3bdU\265C\213\227\225pWV"..., 65600) = 65600
>>> open("/dev/urandom", "rb")
<_io.BufferedReader name='/dev/urandom'>
while (remaining > 0) {
    /* We want to read a whole block at the end into buffer.
       If we had readv() we could do this in one pass. */
    Py_ssize_t r = MINUS_LAST_BLOCK(self, remaining);
    if (r == 0)
        break;
    r = _bufferedreader_raw_read(self, out + written, r);
     * Binary files are buffered in fixed-size chunks; the size of the buffer
       is chosen using a heuristic trying to determine the underlying device's
       "block size" and falling back on `io.DEFAULT_BUFFER_SIZE`.
       On many systems, the buffer will typically be 4096 or 8192 bytes long.
import _io
fp = _io.BufferedReader(_io.FileIO("/dev/urandom", "rb"), 30000)
ans = fp.read(65600)
fp.close()
read(3, "\357\202{u'\364\6R\fr\20\f~\254\372\3705\2\332JF\n\210\341\2s\365]\270\r\306B"..., 60000) = 60000
read(3, "\266_ \323\346\302}\32\334Yl\ry\215\326\222\363O\303\367\353\340\303\234\0\370Y_\3232\21\36"..., 30000) = 30000
open(name[, mode[, buffering]])

There is a trouble to openning debugger window in windows 10 with jxbrowser 6.23 & 6.23.1


By : user2575274
Date : March 29 2020, 07:55 AM
wish helps you It can happen that the Chromium engine can lose UI shared context in some cases. Usually, Chromium will restore the context and continue rendering. In that case, something happened that prevented Chromium from restoring the context.
As a workaround, you can try using accelerated lightweight rendering. It is faster than the usual lightweight rendering and does not use GPU. As a downside, the WebGL functionality will be disabled.

Multiple select() syscalls from one thread in Python


By : Praveen Kumar
Date : March 29 2020, 07:55 AM
will be helpful for those in need Well, within a single thread you can't really have "two select() syscalls", because the first call has to end before you can start the second call. But yes, it's perfectly safe, even if they do share descriptors: both calls create new objects to return, there's no variable re-use that might affect them (like it might with static variables in C.)
Even if you had multiple threads it would be fine, as the select module is careful to hold the GIL until the actual select call. In that case you do have to avoid sharing descriptors, though.

No rule to make target `arch/x86/entry/syscalls/syscall_32.tbl', needed by `arch/x86/entry/syscalls/../../include/genera


By : Srinivasa
Date : March 29 2020, 07:55 AM
hope this fix your issue This could be a syntax error when using $(PWD). Consider changing this:
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