[Linux] 检查是否已有进程在运行

出处：sblim-sfcb-1.4.9 / sfcBroker.c

int process_is_running()
{
        #define STRBUF_LEN 512
        #define BUF_LEN 30
        struct dirent *dp = NULL;
        char *strbuf = malloc(STRBUF_LEN);
        char *buf = malloc(BUF_LEN);
        int mypid = getpid();
        int ret = 0;

        DIR *dir = opendir("/proc");
        while ((dp = readdir(dir)) != NULL) {
            if (isdigit(dp->d_name[0])) {
                sprintf(buf, "/proc/%s/exe", dp->d_name);
                memset(strbuf, 0, STRBUF_LEN);
                if (readlink(buf, strbuf, STRBUF_LEN) == -1) continue;
                if (strstr(strbuf, "进程名字") != NULL) {
                    ret = strtol(dp->d_name, NULL, 0);
                    if (ret == mypid) { ret = 0; continue; }
                    break;
                 }
            }
         }

         closedir(dir);
         free(buf);
         free(strbuf);
         return(ret);
}