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POC programming return 0 does not terminate the program
primarykey
Id
14804830
data
AcceptedAnswerId
14804903
AnswerCount
3
ClosedDate
2013-02-16T03:46:53.350
CommentCount
5
CommunityOwnedDate
CreationDate
2013-02-11T01:46:55.157
FavoriteCount
0
LastActivityDate
2013-02-11T01:59:55.687
LastEditDate
2013-02-11T01:55:30.687
LastEditorUserId
933198
OwnerUserId
2059993
ParentId
0
PostTypeId
1
Score
3
ViewCount
5186
LastEditorDisplayName
text
Body
I wrote this shell for my operating systems course, and for some reason my main function doesn't terminate when I type "exit", its supposed to break from the while loop and then return 0 to main, which should end the program, but instead it just keeps going. In fact, it will tell me its "a bout to exit" and then it will go back into the while loop where it keeps running as usual. Anybody see the problem? Thank you for all your help <pre><code>#include <errno.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define LENGTH 1000 #define MAXCMD 11 void init(char *temp); void clean(char **orderedIds); int main (int argc, char *argv[], char *envp[]) { char temp[LENGTH]; char * tok; char c = '\0'; int *ret_status; pid_t pid; printf("\n$"); int i, j = 0; while(c !=EOF) { //while not ^D // Source: LinuxGazzette Ramankutty c = getchar(); if(c=='\n') { //enter command char **orderedIds = malloc(MAXCMD * sizeof(char*)); for (i=0; i<MAXCMD; i++) { orderedIds[i] = malloc(MAXCMD * sizeof(char*)); } int k=0; tok = strtok(temp, " "); while (tok !=NULL) { strcpy(orderedIds[k], tok); k++; tok = strtok (NULL, " "); } orderedIds[k] = NULL; //END with NULL init(temp); //initialize the array pid = fork(); if (pid != 0) { //printf("Waiting for child (%d)\n", pid); pid = wait(ret_status); } else { if (strcmp(orderedIds[0],"exit")==0) { //check for exit printf("Thank you, now exiting\n"); break; } if (execvp(orderedIds[0], orderedIds)) { printf("%s\n", orderedIds[0]); puts(strerror(errno)); exit(127); } } clean(orderedIds); printf("%s", &c); printf("$ "); } else { strncat(temp, &c, 1); } } printf("\n I'm a bout to exit!"); return 0; exit(0); } void init(char *temp) { //Function to initialize/rest=et the array int i; for(i=0; i<LENGTH; i++) { temp[i] = 0; } } void clean(char **orderedIds) { //garbage collection int i; for(i=0; i<MAXCMD; i++) { free(orderedIds[i]); } free(orderedIds); } </code></pre>
Tags
<c><exit><terminate>
Title
C programming return 0 does not terminate the program
singulars
PostAcceptedAnswerId
1. PO
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 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USLee Taylor
UserOwnerUserId
1. USHarrison
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PostTypePostTypeId
 PTAnswer
2. PO
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 PostTypePostTypeId
 PTAnswer
3. PO
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 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
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 POC programming return 0 does not terminate the program
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 This table or related slice is empty.
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 VTUpMod
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