Error Handling in C

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There is no specific support for error handling in the C program. However, there are some methods defined to find out the error using the return statement. In case of any error in C language, a function returns -1 or NULL value.

A global variable errno is set for the error code. This can be used to check errors in programming.

Below is the list of error numbers and their meaning:

error value	error
1	no operation is permitted
2	no such file or directory
3	no such process
4	interrupted system call
5	I\O error
6	no such device or address
7	argument list too long
8	exec format error
9	bad file number
10	no child process
11	try again
12	out of memory
13	permission denied

Example:

#include <stdio.h>
#include <errno.h>
#include <string.h>

int main ()
{
FILE *fp;

/*
if a file, which does not exists, is opened,
we will get an error
*/

fp = fopen("IWillReturnError.text", "r");
printf("Value of errno: %d\n ", errno);
printf("The error message is : %s\n", sterror(errno));
perror("Message from perror");

return 0;
}