大约有 482 项符合查询结果（耗时：0.0220秒） [XML]
/proc 内核统计信息各文件的含义 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...的统计文件，如下： ls -F proc 904 attr coredump_filter fdinfo make-it-fail mountstats oom_score_adj sched stat 1、各进程的统计文件，如下：
# ls -F /proc/904/
attr/ coredump_filter fdinfo/ make-it-fail mountstats oom_score_adj sched st...
What's the best way to check if a file exists in C?
...itions, then use this:
#include <fcntl.h>
#include <errno.h>
fd = open(pathname, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR);
if (fd < 0) {
/* failure */
if (errno == EEXIST) {
/* the file already existed */
...
}
} else {
/* now you can use the file */
}
...
How to avoid reinstalling packages when building Docker image for Python projects?
...ild:
Step 1 : WORKDIR /srv
---> Running in 22d725d22e10
---> 55768a00fd94
Removing intermediate container 22d725d22e10
Step 2 : ADD ./requirements.txt /srv/requirements.txt
---> 968a7c3a4483
Removing intermediate container 5f4e01f290fd
Step 3 : RUN pip install -r requirements.txt
---> Ru...
Do sealed classes really offer performance Benefits?
... ecx,183994h (MT: ScratchConsoleApplicationFX4.NormalClass)
003c00b8 e8631fdbff call 00172020 (JitHelp: CORINFO_HELP_NEWSFAST)
003c00bd e80e70106f call mscorlib_ni+0x2570d0 (6f4c70d0) (System.Console.get_Out(), mdToken: 060008fd)
003c00c2 8bc8 mov ecx,eax
003c00c4 8b1...
How do I edit an incorrect commit message in git ( that I've pushed )?
...
Suppose you have a tree like this:
dd2e86 - 946992 - 9143a9 - a6fd86 - 5a6057 [master]
First, checkout a temp branch:
git checkout -b temp
On temp branch, reset --hard to a commit that you want to change its message (for example, that commit is 946992):
git reset --hard 946992
Use...
Linux进程与线程总结 [推荐] - C/C++ - 清泛网 - 专注C/C++及内核技术
...
下面是管道的创建函数：
#include <unistd.h>
int pipe(int fd[2])
函数参数为一个长度为2的整型数组，fd[0]表示管道的读端，fd[1]表示管道的写端，如果读写端顺序颠倒，将导致错误发生。另外管道的读写及关闭操作均利用一般文件I...
How to detect if my shell script is running through a pipe?
...thetic is piped to cat.
The -t flag is described in man pages as
-t fd True if file descriptor fd is open and refers to a terminal.
... where fd can be one of the usual file descriptor assignments:
0: stdin
1: stdout
2: stderr
...
How to prune local tracking branches that do not exist on remote anymore
...tandard Bourne shell):
git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -d
This string gets the list of remote branches and passes it into egrep through the standard input. And filters the branches that have a remote ...
Check whether or not the current thread is the main thread
..., 0x00000001083515a0 MyApp`MyApp.ViewController.sliderMoved (sender=0x00007fd221486340, self=0x00007fd22161c1a0)(ObjectiveC.UISlider) -> () + 112 at ViewController.swift:20, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
If the value for queue is com.apple.main-thread, then you'r...
C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术
...：
01 00423FBD cmp dword ptr [ebp+FFFFF73Ch],0
02 00423FC4 je 00423FD7
03 00423FC6 mov eax,dword ptr [ebp+FFFFF73Ch]
04 00423FCC add eax,5
05 00423FCF mov dword ptr [ebp+FFFFF014h],eax
06 00423FD5 jmp 00423FE1
07 00423FD7 mov dword ptr [ebp+FFFFF014h],0
08 00423FE1 mov ecx,dword p...