strace

I know the -s option should display longer arguments, but it doesn't work always (probably because of those curly brackets meaning array or nested arguments?). Even after running strace -s1000 my_command this argument is still truncated: ioctl(3, SNDCTL_TMR_TEMPO or TCGETA, {B9600 -opost -isig -icanon -echo ...}) = 0 How can I see the complete arguments? There is such option in the strace parameters - you should use -v command line switch. Furthermore, due to the opensource nature of this great utility, you can disable abbreviation totally by patching the defs.h header in the strace sources :

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I need help on stracing Android apps in the SDK emulator. Here is my setup: I have an Android SDK emulator running the Android API 4.03 ADB shell connected to emulator. I am able to install an APK using the ADB install filename.apk I am able to run the app using the ADB shell am start -a android.intent.action.Main -n com.akproduction.notepad/com.akproduction.notepad.NoteList I try to strace using (ADB shell) strace am start -a android.intent.action.Main -n com.akproduction.notepad/com.akproduction.notepad.NoteList but I get nothing

I need to track read system calls for specific files, and I'm currently doing this by parsing the output of strace . Since read operates on file descriptors I have to keep track of the current mapping between fd and path . Additionally, seek has to be monitored to keep the current position up-to-date in the trace. Is there a better way to get per-application, per-file-path IO traces in Linux? First, you probably don't need to keep track because mapping between fd and path is available in /proc/PID/fd/ . Second, maybe you should use the LD_PRELOAD trick and overload in C open , seek and read

1、在linux中，一切皆为文件，所有不同种类的类型都被抽象成文件（比如：块设备，socket套接字，pipe队列） 2、操作这些不同的类型就像操作文件一样，比如增删改查等 3、块设备支持随机访问，而字符设备只能依据先后顺序来读取数据。最典型的字符设备就是tty 组件 版本 OS CentOS Linux release 7.5.1804 根据史料记载： An ASR33 Teletype - origin of the abbreviation tty. tty来源一种电传打印机（teletype），就像这样： ● 敲击键盘输入不同的字符，然后由打印机将字符打印在纸上 ● 历史不断在往前发展，出现了计算机之后，计算机模拟了teletype的模式：通过外部终端输入，将输入的字符打印在屏幕上 ● 在teletype与计算机之间用串口相连，并且在计算机上通过信号转换（模拟信号转换为数字信号），让计算机能够识别，从而操作计算机 ● 由于计算机厂商众多，每个厂商都有自己风格的输入设备，所以计算机为了兼容这些设备，开发了内核tty模块 +-----------------+ | | +--------+ | +-------------+ | |teletype|-----------------> |serial | | +--------+ | |communication| | | +

I have a python GUI application. And now I need to know what all libraries the application links to. So that I can check the license compatibility of all the libraries. I have tried using strace, but strace seems to report all the packages even if they are not used by the application. And, I tried python ModuleFinder but it just returns the modules that are inside python2.7 and not system level packages that are linked. So is there any way I can get all the libraries that are linked from my application? You can give a try to the library https://github.com/bndr/pipreqs found following the guide

I do know that strace uses ptrace to do the job, but it needs to run the target process with TRACE_ME on, which don't apply for the case of an already running process. how does it work on an already running process? Prabhat Kumar Singh strace -p <PID> ----> To attach a process to strace . "-p" option is for PID of the process. strace -e trace=read,write -p <PID> --> By this you can also trace a process/program for an event, like read and write (in this example). So here it will print all such events that include read and write system calls by the process. Other such examples -e trace= network

I need to profile the performance of an application for which I am using strace. However, I do not really know how to interpret the various system calls the strace emits. Examples of a few of them are below: (A) lseek(3, 1600, SEEK_SET) = 1600 (B) write(3, "G_DATA 300 0 "..., 800) = 800 (C) close(3) = 0 (D) mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b600b179000 (E) munmap(0x2b600b179000, 4096) = 0 (F) fstat(3, {st_mode=S_IFREG|0644, st_size=1600, ...}) = 0 I would be grateful if someone could briefly explain in plain English what these lines from (A) to (F)

The problem is that the script hangs up after some long time. strace returns something like this and nothing else: Process 7286 attached - interrupt to quit restart_syscall(<... resuming interrupted call ...>) = 0 poll([{fd=13, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout) clock_gettime(CLOCK_MONOTONIC, {1817569, 74651533}) = 0 clock_gettime(CLOCK_MONOTONIC, {1817569, 74734744}) = 0 clock_gettime(CLOCK_MONOTONIC, {1817569, 74812047}) = 0 poll([{fd=13, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 1000) = 0 (Timeout) poll([{fd=13, events=POLLIN|POLLPRI|POLLRDNORM