exec

问题 So, I am trying to run a background process and execvp from it. When i enter cp /path/file /var/tmp, the process is not copying the file. Here is my code for reference: void cmd_bg(char command[]) { pid_t process_id = 0; pid_t sid = 0; char* argv[512]; getArgv(command,argv); // Create child process process_id = fork(); // Indication of fork() failure if (process_id < 0) { printf("fork failed!\n"); // Return failure in exit status exit(1); } // PARENT PROCESS. Need to kill it. if (process_id >

问题 I have a following code: code = """ print("foo") if True: return print("bar") """ exec(code) print('This should still be executed') If I run it I get: Traceback (most recent call last): File "untitled.py", line 10, in <module> exec(code) File "<string>", line 5 SyntaxError: 'return' outside function How to force exec stop without errors? Probably I should replace return with something? Also I want the interpreter work after exec call. 回答1: Here, just do something like this: class

问题 I would like to know how to test if system() or exec() is allowed on a server. I keep getting this error "Warning: exec() has been disabled for security reasons in ..." I understand that the safe_mode function is depreciated in the php version my provider runs (5.3.3) so i cant use a get_ini('safe_mode') check. What else to do? I use this for a backup script. if the provider allows system, the script makes a tar file and mails it to me whenever a user logs in. Thanks in advance. 回答1: Well,

问题 It seems like I can't use shell_exec or proc_open on my shared server. The message I get when I try to use it is: Warning: shell_exec() has been disabled for security reasons in /home/georgee/public_html/admin/email.php on line 4 Are there any alternatives to these functions? 回答1: I assume you want to use this for async processing, for instance sending eMails in a separate process (hence the error in email.php). If so, please check if cURL is enabled. You can trigger your scripts through an

问题 So I've looked at similar questions, and I've found some solutions to this, but I can't quite figure out how to do this. What I'm trying to do is add a method to a class from a string. I can do this with the setattr() method, but that won't let me use self as an attribute in the extra method. Here's an example: (and I apologize for the variable names, I always use yolo when I'm mocking up an idea) class what: def __init__(self): s = 'def yolo(self):\n\tself.extra = "Hello"\n\tprint self.extra

问题 So I've looked at similar questions, and I've found some solutions to this, but I can't quite figure out how to do this. What I'm trying to do is add a method to a class from a string. I can do this with the setattr() method, but that won't let me use self as an attribute in the extra method. Here's an example: (and I apologize for the variable names, I always use yolo when I'm mocking up an idea) class what: def __init__(self): s = 'def yolo(self):\n\tself.extra = "Hello"\n\tprint self.extra

问题 I have a program on my linux server that asks the same series of questions each time it executes and then provides several lines of output. My goal is to automate the input and output with a php script. The program is not designed to accept input on the command line. Instead, the program asks question 1 and waits for an answer from the keyboard, then the program asks question 2 and waits for an answer from the keyboard, etc. I know how to capture the output in an array by writing: $out =

问题 I am learning linux programming and came across exec function which is kind of very useful. But the problem is exec function arguments are very confusing and I am unable to grasp which argument is for what purpose.. In the following code execl() function is called from a child created through fork() , What is the purpose of the last argument ( NULL ) in execl() ? execl("/bin/ls","ls","-l",NULL); If any one can explain what is the purpose of NULL argument and other arguments and the purpose of

问题 I ran the following command in shell to batch convert .HEIC files to .JPG files, the command is successful, however there's a part of it I don't understand: find . -name '*.HEIC' -exec sh -c 'magick convert $1 "${1%.HEIC}.JPG"' _ {} \; Apparently _ {} acts to assign find result to $1 , but how? I can't find an explanation on google nor here, and didn't have any luck with man find . It's entirely possible that answers were here but these symbols are not very nice to search for. So the question

问题 I have a C++ executable file 'skypeforwarder'. skypeforwarder works if I use command line in Terminal in Mac: henry$ /Users/henry/Desktop/skypeForwarder/skypekit-sdk_sdk-4.1.2.20_793394/examples/cpp/tutorial/step3/skypeForwarder sh: /Users/henry/Desktop/skypeForwarder/skypekit-sdk_sdk-4.1.2.20_793394/examples/cpp/tutorial/step3/skypeForwarder: Permission denied But it always issued 'permission denied' if it is called in php exec(); <?php echo exec('whoami'); $output = null; $execBuild = '