ferror

Trouble creating a shell in C (Seg-Fault and ferror)

由 我的梦境 提交于 2020-01-16 05:14:16
问题 I have been following a tutorial on how to make my own shell but I have been stuck for a couple days now. Two things: When this code is compiled and ran, it will randomly have segmentation faults and I cannot figure out why. The if statement `if (ferror != 0)` always seems to be true. which is odd because I do not understand why fgets() is failing in the main() function. Any information on these topics (or other topics about creating this shell) would be greatly appreciated. #include <stdio.h

How to use feof and ferror for fgets (minishell in C)

由 独自空忆成欢 提交于 2020-01-11 12:45:28
问题 I've written this minishell but I'm not sure I'm making a correct control of the errors. I know fgets can return feof and ferror (http://www.manpagez.com/man/3/fgets/) but I don't know how to use them. I've checked if fgets returns a null pointer (which indicates the content of the buffer is inditerminate) but i would like to know how to use feof and ferror. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> #define LINE_LEN 50 #define MAX_PARTS 50 int main () {

How to use feof and ferror for fgets (minishell in C)

由 岁酱吖の 提交于 2020-01-11 12:45:13
问题 I've written this minishell but I'm not sure I'm making a correct control of the errors. I know fgets can return feof and ferror (http://www.manpagez.com/man/3/fgets/) but I don't know how to use them. I've checked if fgets returns a null pointer (which indicates the content of the buffer is inditerminate) but i would like to know how to use feof and ferror. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> #define LINE_LEN 50 #define MAX_PARTS 50 int main () {

Do ferrors carry through multiple writes?

由 浪子不回头ぞ 提交于 2019-12-20 06:27:25
问题 Does the ferror in this example check check both fprintf s for error, or just the second one? FILE * myout; if ((myout = fopen("Assignment 11.txt", "a")) != NULL) { fprintf(myout, "First print ", str1); fprintf(myout, "Second print", str1); if (ferror(myout)) fprintf(stderr, "Error printing to file!"); fclose(myout); } 回答1: If an error occurs, it won't be reset unless clearerr is called on your stream, so yes, an error occuring on any of both writes is recorded. from ferror manual page: The

What are the possible error conditions on a stream that will cause ferror() to be set?

由 北城余情 提交于 2019-12-11 00:49:48
问题 Some operations to read and write from streams may set the error flag in a stream, which can be tested using ferror(stream) , while I'm quite sure this must be a frequently asked question, I wasn't able to find a list of all the possible causes of errors in SO or in the general web. What could cause ferror() to be set? In particular, I'm looking for the possible causes of errors when doing fgets() on the standard input on Minix 3, but I'm looking for a more general list as well. 回答1: There

How to use feof and ferror for fgets (minishell in C)

由 血红的双手。 提交于 2019-12-02 10:07:17
I've written this minishell but I'm not sure I'm making a correct control of the errors. I know fgets can return feof and ferror ( http://www.manpagez.com/man/3/fgets/ ) but I don't know how to use them. I've checked if fgets returns a null pointer (which indicates the content of the buffer is inditerminate) but i would like to know how to use feof and ferror. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> #define LINE_LEN 50 #define MAX_PARTS 50 int main () { char* token; char str[LINE_LEN]; char* arr[MAX_PARTS]; int i,j; bool go_on = true; while (go_on ==
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