如何保证一个程序在单台服务器上只有唯一实例（linux）
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如何保证一个程序在单台服务器上只有唯一实例（linux）
如何保证一个程序在单台服务器上只有唯一实例呢，本着简单实用的思想写了一个实现函数：
以下是代码片段：
/* 判断当前进程是否已经运行 */
static bool is_running(const char* prg)
{
const char* pid_file = “.tmp_pid”;
const char* p = strrchr(prg, ‘/’);
if (p)
{
p++;
}
else
{
p = prg;
}
char cmd[128] = {0};
sprintf(cmd, “pgrep %s >%s”, p, pid_file);
system(cmd);
std::string s;
FILE* fp = fopen(pid_file, “r”);
if (fp == NULL)
{
fprintf(stderr, “ERROR: can not open pid file: %s!\n”, pid_file);
return false;
}
int pid;
while (read_line(fp, s))
{
pid = atoi(s.c_str());
if ((pid_t)pid != getpid())
{
break;
}
else
{
pid = 0;
}
}
fclose(fp);
sprintf(cmd, “rm -f %s”, pid_file);
system(cmd);
return pid>0;
}
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