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Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
...xit(1);
}
}
// 锁定文件后，将该进程的pid写入文件
char buf[16] = {};
sprintf(buf, "%d", getpid());
ftruncate(fd, 0);
ret = write(fd, buf, strlen(buf));
if (ret < 0) {
printf("Write file failed, file: %s, error: %s\n", kPidFileName, strerror(errno));
close(fd);
...
libunwind：记录程序崩溃堆栈 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...all
记录堆栈的代码如下：
static void log_backtrace(void) {
char name[256];
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp, offp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
syslog(LOG_ERR, "--illegal memory access--");
while(unw_step(&cursor) > 0) {...
Warning: The Copy Bundle Resources build phase contains this target's Info.plist file
...Resources build phase or make it a target member.
To resolve this warning, select your Info.plist from the Copy Bundle Resource build phase as shown in Figure 1, then click the Remove (–) button to delete it from the phase.
...
Input placeholders for Internet Explorer
...n(){
if (input.val() === text) input.css({ color:'lightGrey' }).selectRange(0,0).one('keydown', function(){
input.val("").css({ color:'black' });
});
});
input.blur(function(){
if (input.val() == "" || input.val() === text) input.val(text)...
How to create a directory using Ansible
...
this uses the old syntax with = chars, would be great to update it with the : syntax with each atribute on a new line
– ympostor
Jun 8 '17 at 7:52
...
What's the difference between streams and datagrams in network programming?
...ets
stream (TCP, order and delivery guaranteed,no duplication,no length or char boundaries for data,connection-oriented,reliable, concurrency)
datagram(UDP,packet-based, connectionless, datagram size limit, data can be lost or duplicated, order not guaranteed,not reliable)
raw (direct access to lowe...
Recommended method for escaping HTML in Java
Is there a recommended way to escape < , > , " and & characters when outputting HTML in plain Java code? (Other than manually doing the following, that is).
...
Drop multiple tables in one shot in mysql
... of tables to be deleted.
Get table using the below
For sql server - SELECT CONCAT(name,',') Table_Name FROM SYS.tables;
For oralce - SELECT CONCAT(TABLE_NAME,',') FROM SYS.ALL_TABLES;
Copy and paste the table names from the result set and paste it after the DROP command.
...
sql ORDER BY multiple values in specific order?
...
You can order by a selected column or other expressions.
Here an example, how to order by the result of a case-statement:
SELECT col1
, col2
FROM tbl_Bill
WHERE col1 = 0
ORDER BY -- order by case-statement
CASE WHEN tbl_Bi...
Add shadow to custom shape on Android
...;/shape>
</item>
</layer-list>
Then you should have a selector with diferent versions of the button, something like:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawabl...