system()调用出错提示 Cannot allocate memory

[hyd034]

INT DISK_CreateDir(CHAR * FilePath) //创建文件夹
{
DIR *dirp = NULL;
CHAR Command[COMMAND_LEN] = {0};
if(NULL==FilePath){
NVR_DEBUG("create %s fail",FilePath);
return FALSE;
}
if(NULL==(dirp=opendir(FilePath))){
sprintf(Command,"mkdir -p %s",FilePath);

if(0!=system(Command)){
NVR_DEBUG(" %s fail,errno=%d",Command,errno);
perror("mkdir fail:");
return FALSE;
}else{
NVR_DEBUG(" %s ok",Command);
if(dirp) closedir(dirp);
dirp = NULL;
return TRUE;
}
}else{
NVR_DEBUG("file Exist");
if(dirp) closedir(dirp);
return TRUE;
}
}

程序执行时提示出错：
mkdir fail:: Cannot allocate memory

[赵4老师]

写个临时bat文件，调用这个临时bat文件再试试？

[赵4老师]

C:\>mkdir /?
Creates a directory.

MKDIR [drive:]path
MD [drive:]path

If Command Extensions are enabled MKDIR changes as follows:

MKDIR creates any intermediate directories in the path, if needed.
For example, assume \a does not exist then:

mkdir \a\b\c\d

is the same as:

mkdir \a
chdir \a
mkdir b
chdir b
mkdir c
chdir c
mkdir d

which is what you would have to type if extensions were disabled.

[hyd034]

单独测试函数可以创建成功：
int main()
{
DISK_CreateDir("/mnt/sda1/a/b/c");
}
供其他函数调用时就会出现Cannot allocate memory 错误

[沭水河畔]

调一下栈大小试试，用ulimit。
system()的实现 ≈ fork + exec
fork的特点大家都知道，当程序占内存很大时，fork一次也是不小的开销。
有一种可行的做法是另开一个小程序来处理系统命令，主应用程序通过进程间通信的方式发送命令给小程序，小程序再来执行。