多个进程访问同一个文件(Multiple processes accessing the same file)

 多个进程是否可以同时访问（写入）同一个文件？ 使用下面的代码，它似乎工作，但我有我的怀疑。 
 
 实例中的用例是每次收到电子邮件时都会调用的可执行文件，并将其输出记录到中央文件中。 
 
if (freopen(console_logfile, "a+", stdout) == NULL || freopen(error_logfile, "a+", stderr) == NULL) {
    perror("freopen");
}
printf("Hello World!");
 
 这是在CentOS上运行并编译为C. 

Is it alright for multiple processes to access (write) to the same file at the same time? Using the following code, it seems to work, but I have my doubts.
 
Use case in the instance is an executable that gets called every time an email is received and logs it's output to a central file.
 
if (freopen(console_logfile, "a+", stdout) == NULL || freopen(error_logfile, "a+", stderr) == NULL) {
    perror("freopen");
}
printf("Hello World!");
 
This is running on CentOS and compiled as C.

原文：https://stackoverflow.com/questions/9880771