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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
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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#define kPidFileName "app.pid"
bool enter_app_singleton() {
int fd = open(kPidFileName, O_RDWR | O_TRUNC);
if (fd == -1) {
//对应的锁...
Suppress warning messages using mysql from within Terminal, but password written in bash script
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I use something like:
mysql --defaults-extra-file=/path/to/config.cnf
or
mysqldump --defaults-extra-file=/path/to/config.cnf
Where config.cnf contains:
[client]
user = "whatever"
password = "whatever"
host = "whatever"
This allows you to have multiple config f...
What does “zend_mm_heap corrupted” mean
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The nature of the error is this:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void) {
void **mem = malloc(sizeof(char)*3);
void *ptr;
/* read past end */
ptr = (char*) mem[5];
/* write past end */
memcpy(mem[5], "whatever", s...
Is there a real solution to debug cordova apps [closed]
...ot find my phone until I ran adb start-server.
– Leukipp
Mar 14 '16 at 7:17
@Leukipp I also face same problem but afte...
Flags to enable thorough and verbose g++ warnings
...op). It is also warning for the
constructor of a const array of const std::string (where this is no
loop in user code).
-Wzero-as-null-pointer-constant and -Wuseless-cast are
GCC-4.7-only warnings, which I will add when I transition to GCC 4.7.
I've filed a few bug reports / enhancement requests a...
Sockets: Discover port availability using Java
... at port is available. It tests whether it is in LISTEN state, whether the IP address is reachable, etc.
– Marquis of Lorne
Jul 27 '15 at 22:55
1
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Do you have to restart apache to make re-write rules in the .htaccess take effect?
...nswered Sep 27 '08 at 0:31
PiedPiperPiedPiper
5,27911 gold badge2727 silver badges3838 bronze badges
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IPC performance: Named Pipe vs Socket
Everyone seems to say named pipes are faster than sockets IPC. How much faster are they? I would prefer to use sockets because they can do two-way communication and are very flexible but will choose speed over flexibility if it is by considerable amount.
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How do C++ class members get initialized if I don't do it explicitly?
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For objects, their default constructor is called. For example, for std::string, the default constructor sets it to an empty string. If the object's class does not have a default constructor, it will be a compile error if you do not explicitly initialize it.
For primitive types (pointers, ints, e...
How do I compare strings in Java?
I've been using the == operator in my program to compare all my strings so far.
However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.
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