Search DaniWeb - execvp

execvp return help... 19 Years Ago by joshuatree … command entry and the passing of this to execvp? The parent process currently `waits(stat_val)` for…failed"); exit(0); case 0: if(args != NULL){ execvp(args[0],args); } exit(0); default: status = 0…child process using fork() (2) the child process invokes execvp() (3) if background == 1, the parent will … execvp() and my program gets stuck, send() and it works. 12 Years Ago by Fredszky …//Redericting information to socket dup2(s2, STDERR_FILENO); execvp (program, arg_list);abort (); // Executing the …//Redericting information to socket dup2(s2, STDERR_FILENO); execvp (program, arg_list);abort (); // Executing the… Re: How can I tell if execvp failed? 15 Years Ago by VernonDozier …, char*argv[]) { char* args[3] = {argv[1], argv[2], NULL}; execvp(args[0], args); fprintf(stdout, "failed\n"); exit…"); } printf ("Program done"); return 0; } [/code] "execvp did not execute successfully" displays once, "Program done… problem with execvp in C 14 Years Ago by letaki … a project in C i'm trying to procces.. Execvp is always returning -1.. and this warning "… passing argument 2 of ‘execvp’ from incompatible pointer type" .. here's the source … //sprintf(args[6],"%s",NULL); int X=execvp ("compute",args); printf("X=%d",… How can I tell if execvp failed? 15 Years Ago by VernonDozier … == 0) { printf ("pid == 0\n"); execvp(paramList[0], paramList); printf("Error : execvp did not execute successfully.\n"); } printf… uncomment line 3 and that changes it to make an execvp call to a non-existent program. I expected line 15… Re: problem with execvp in C 14 Years Ago by gerard4143 Its a warning so it may work...Try casting the offending variable int X=execvp ("compute",(char* const*)args); Re: problem with execvp in C 14 Years Ago by nezachem …[7]; real_args[0] = args[0]; real_args[1] = args[1]; // etc; execvp("compute", real_args);[/CODE] General Question about execlp/execvp 16 Years Ago by wsn Is the difference between the execlp execvp calls and execl execv, is that execlp execvp have the advantage of specifying a file name instead of a path name what makes these two functions better to use over execl and execv? how can i treate with execvp?!! 15 Years Ago by forislam14 i have an assignment which let the user writes into the terminal -linux system- any command and i should take this command he wrote to execute it using fork and execvp() i already can fork a child .. but cant pass parameters to execvp cuz i can't understand what these parameters means :D Thank you; Re: how can i treate with execvp?!! 15 Years Ago by Ancient Dragon …/blcmdl3_execvp.htm"]Read this[/URL]. [quote] The execv and execvp functions provide an array of pointers to null-terminated strings… Fork And ExecLP/ExecVP small problem - linux 13 Years Ago by Despairy …[1])!=0)) perror("execlp error"); } [/CODE] {same with execvp} the problem is when the user entered "ls -l… Re: How can I tell if execvp failed? 15 Years Ago by gerard4143 Here's what the manpages have to say... [QUOTE] RETURN VALUE If any of the exec() functions returns, an error will have occurred. The return value is -1, and errno will be set to indicate the error. [/QUOTE] Re: How can I tell if execvp failed? 15 Years Ago by VernonDozier [QUOTE=gerard4143;1175239]Here's what the manpages have to say...[/QUOTE] Right. If there was an error, it should have returned and thus line 15 should have been printed. But it wasn't printed. Re: How can I tell if execvp failed? 15 Years Ago by jephthah does it print "program done" and return 0? Re: How can I tell if execvp failed? 15 Years Ago by gerard4143 [QUOTE=jephthah;1175329]does it print "program done" and return 0?[/QUOTE] Which one..The program forks Re: How can I tell if execvp failed? 15 Years Ago by jephthah point. so i mean, does it do it print that end message twice, from the parent and the child? or just once? (or none?) i don't have the answer, i'm just trying to narrow down possibilities. Re: How can I tell if execvp failed? 15 Years Ago by gerard4143 I wrote this simple program to demonstrate how the exec family of functions behave: testp.c [CODE] #include <stdio.h> #include <stdlib.h> #include <unistd.h> int main(int argc, char**argv) { execlp(argv[1], argv[1], NULL); fprintf(stdout, "failed\n"); exit(EXIT_SUCCESS); } [/CODE] Usage: execute … Re: How can I tell if execvp failed? 15 Years Ago by VernonDozier Well, I can't recreate the earlier behavior and it works now, so I guess it's solved. Thanks guys! Re: General Question about execlp/execvp 16 Years Ago by Ancient Dragon >>what makes these two functions better to use over execl and execv? Nothing. It just depends on how you want to use them. As described [URL="http://linux.die.net/man/3/execlp"]here[/URL] execlp will search the PATH environment variable for the executable if [b]path[/b] parameter does not contain a slash. Re: General Question about execlp/execvp 16 Years Ago by wsn Thanks! Re: What is execv equivalent api 16 Years Ago by John A execvp() Help With Making A Shell 15 Years Ago by jeeter19 … and run the program at the given path using execvp, and must also parse the parameters. I must…problem lies in when I try to do the execvp() method, the program says that it was unable …//Execute the command with params: execvp(myCmd->name, myCmd->argv); perror("execvp failed to run"); exit(-1… empty shell supporting a delete command 15 Years Ago by badboizEnt …Child executes the code inside the if */ if (pid == 0) { execvp (*args, args); perror (*args); exit (1) /* NOTE. The execv…are unknown in advance: The arguments to execv() abd execvp() are the name of the file to be executed…must be followed by a 0 pointer. execlp() and execvp() are called with the same arguments as execl() and… Multipme pipes in C 13 Years Ago by mullan123 … pipe"); } close(pipedes[1]); // this is now STDOUT_FILENO execvp(*command1, command1); } if ((pid2 = fork()) == -1) … } close(pipedes[0]); // this is now STDIN_FILENO execvp(*command2, command2); } close(pipedes[0]); close(pipedes[… Re: Making a UNIX Shell, so inexperienced at it 19 Years Ago by kharri5 … the help btw. Good show! If execvp returns, you still have two processes running…you mean something like the following. Since execvp returns -1 when it fails, then …;< endl; exit(-1); case 0: execvp(cmd[0], cmd); if(execvp(cmd[0], cmd) == -1) { … shell programming using C 16 Years Ago by sting_010 … whitespace or a tab or ...). Executing Commands Look into fork(), execvp(), and wait/waitpid(). The fork() system call creates a new… the exec family; for this project, you must use execvp(). Remember that if execvp() is successful, it will not return; if it… Figuring out redirection of a child process to a file 15 Years Ago by opt!kal …], STDIN_FILENO); dup2(fd[k][1], STDOUT_FILENO); argue = getargs(sepCmd[k]); execvp(argue[0], argue); perror(argue[0]); exit(0); } } /*Block …sepCmd[k]); if (srch) dup2(open(srch, O_RDWR|O_CREAT), STDOUT_FILENO); execvp(argue[0], argue); perror(argue[0]); exit(0); } while(… Re: Multiple Threads in Opening Multiple Web Sites? 14 Years Ago by shinsengumi …: [CODE] pid_t pid = fork(); if (pid == 0) { execvp(...); goes to another website } else { execvp(..); goes to 1 website } /*anything below this is… reason*/ pid_t pid2 = fork(); if (pid2 == 0) { execvp(...); goes to another website } else { execvp(..); goes to 1 website } [/CODE] Like my problem… Re: Making a UNIX Shell, so inexperienced at it 19 Years Ago by kharri5 … simply include something to handle it after your execvp call. If the call fails, you can … << endl; exit(-1); case 0: execvp(cmd[0], cmd); default: wait(NULL); times(&…you mean by putting a line after the execvp line. What would the line contain? An… Re: Create UNIX Shell Pipes handler 15 Years Ago by boblied … (a Unix requirement, not a C++ one) -- otherwise how does execvp() know where the arguments end?. In the child's… execvp(), args1 isn't terminated with a 0; and in the …parent's execvp(), the second argument should be [inlinecode]args+pipeno1+1[/inlinecode…