c - C 程序在记录前退出

Question

我以前遇到过这样的事情，但通常只是在处理stdout.

#define LOG 1

static void logoutput(char *info) {
    FILE *dbg;
    dbg = fopen(LOGFILE, "a+");
    if(dbg != NULL) {
        fprintf(dbg, "Mix%d: %s\n", MIXNUM, info);
        fclose(dbg);
    }
    else printf("Error writing to log file.\n");
    return;
}

if (data[0] != NULL) {
    if(LOG) logoutput("WARNING, something bad happened on port 1!");
    exit(1); //Adding a sleep(1); before this didn't help.
}

我遇到的问题是，当 时data[x] != NULL，程序立即退出并且从不记录任何内容。

我尝试添加一个sleep(1);，但这并没有成功。我四处搜寻，但找不到合适的条款。处理这个问题的最佳方法是什么？

Answer 1

为什么不试试下面的代码？

#define LOG 1

static int logoutput(char *info) {
    FILE *dbg = NULL;
    dbg = fopen(LOGFILE, "a+");
    if(dbg != NULL) {
        fprintf(dbg, "Blah%d: %s\n", PARTNUM, info);
        fclose(dbg);
    }
    else {
        printf("Error writing to log file.\n");
    }
    return 0;//all good!
}    

static void logoutput_exit(char *info) {
   while(logoutput(info) != 0);
   exit(1);
}

if (data[0] != NULL) {
    if(LOG) logoutput_exit("WARNING, something bad happened on port 1!");
    //Adding a sleep(1); before this didn't help.
}