execvp bad address error East Wilton Maine

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execvp bad address error East Wilton, Maine

I know that reshist() function does not works correct to add inputs to the list, but that is not a big deal. share|improve this answer edited Nov 13 '15 at 12:59 answered Dec 8 '13 at 8:54 alk 45k53497 I have read about the NULL terminator and tried to NULL the Forum Today's Posts C and C++ FAQ Forum Actions Mark Forums Read Quick Links View Forum Leaders What's New? Not the answer you're looking for?

Exploded Suffixes What emergency gear and tools should I keep in my vehicle? For example, if the input line is a string as follows: "cp abc.CC xyz.TT" Function parse() will return array argv[] with the following content: Function execute() takes array argv[], treats it execvp() returns a negative value if the execution fails (e.g., the request file does not exist). Join Date Sep 2004 Posts 46 arg_vector prints correctly.

Join them; it only takes a minute: Sign up execvp: bad address error up vote 2 down vote favorite 1 I am working on linux to create a shell serving with The time now is 04:05 AM. more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Thanks in advance!

Then, the second argument will be provided to the program and starts the execution. I have a function which receives a string as an argument. I have a reshist() function to reset the array that contains the inputs entered by user. Thank you very much.

The args array should contain something like this: Code: my_args[0] = "/usr/bin/ls"; my_args[1] = "-l"; my_args[2] = "/etc"; my_args[3] = "/bin"; my_args[4] = NULL; Maybe you should print your arg_vector array Am I initializing arg_vector correctly? 07-17-2005 #4 Codeplug View Profile View Forum Posts Registered User Join Date Mar 2003 Posts 4,941 >> arg_vector = (char **)malloc(sizeof(char **) *(total_tokens + 1)); >> House of Santa Claus New tech, old clothes How is the Heartbleed exploit even possible? Please try the request again.

Going to be away for 4 months, should we turn off the refrigerator or leave it on with water inside? Which option did Harry Potter pick for the knight bus? By sagar in forum Unix and Linux basics Replies: 0 Last Post: 11-18-2013, 03:40 PM Php - `gcc: error trying to exec 'cc1': execvp: No such file or directory` When compi asked 2 years ago viewed 4783 times active 11 months ago Related 0Executing a separated command using execvp in C0Weird behavior of fork() and execvp() in C5Building a C shell.

The second argument is a pointer to an array of character strings. arg_vector is a char**, so it's a pointer to char* things, so you need to be using sizeof(char*). The problem is why I get the error. Any hints would be much appreciated.

Comments on this post Stefan1  agrees If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut. Why is it a bad idea for management to have constant access to every employee's inbox Game of Life, a shorter story How would you help a snapping turtle cross the The error returned by perror is: perror: Bad address. Any better ideas to make them work together? #include #include #include #include #include #include #include #include #include #include #include #define MAX_BUFFER 129 // max line buffer #define MAX_ARGS 32 // max

Similar topics Catch < Ctrl + C > on Linux ==> can not run execvp what does this function do execvp()? Quick Navigation C Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Programming Boards C++ Programming C Programming C# Programming Game Programming Networking/Device Communication All you have is an uninitialized pointer to pointer to char. I have a reshist() function to reset the array that contains the inputs entered by user.

execvp returns 'No such file' error. Post reply

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Click here to download a copy. #include #include void parse(char *line, char **argv) { while (*line != '\0') { /* if not the end of line ....... */ while reshist() function and multiple pipe operation works well when they are not together, but when I use them both, it causes execvp() to raise "bad address" error. Creating a game, from start to finish Recent additions How to create a shared library on Linux with GCC - December 30, 2011 Enum classes and nullptr in C++11 - more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Your cache administrator is webmaster. execvp bad address P: n/a noelloen hi, I have the following code, int ret; char ** vector; //vector[0] = "ls" vector[1] ="-al" ..... //fork a child ...... Thank you so much. –Bar Dec 8 '13 at 12:44 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up Thanks. –Bar Dec 8 '13 at 12:45 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted The code seems to miss to NULL-terminate arrays[k].

This string should be in the format: The function extracts the program name and stores it in the programName array. using execvp/fork to catenate a file stdout not flushed before os.execvp() Redirect output of execvp to a buffer execvp: ar: Arg list too long error --> when compiling wsdls in Unix Search Engine Optimisation provided by DragonByte SEO v2.0.32 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. As the documentation for execvp (which is non standard , ask in comp.unix.programmer for *nix specifics) , the argument list must end with a NULL pointer.

Here's the code fragment: Code: char **arg_vector = NULL; char *running = NULL; char *token = NULL; int i = 0; int total_tokens = 0; /* count_tokens returns the correct number Try creating an array of char pointers so that you can terminate it with a NULL: char *pArgs[] = {"ls", "-l", NULL}; execvp(pArgs[0], pArgs); share|improve this answer edited Sep 24 at Once parse() finds a non-white space, the address of that location is saved to the current position of argv and the index is advanced. Forum FAQ Calendar Community Member List Forum Actions Mark Forums Read Quick Links View Site Leaders Blogs What's New?

The following is an example (in file shell.c). more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Isn't that more expensive than an elevated system?