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Monday 19 March 2012

strerror

Header file:
    string.h

Synopsis:
    char *strerror(int errnum);

Description:
    Returns a pointer to a string that describes the error code which is passed as argument.


Sample program for strerror in C:



  #include<stdio.h>
  #include<string.h>
  #include<errno.h>
  int main(int argc, char **argv) {
        FILE *fp;
        char *errmsg;
        fp = fopen(argv[1], "r");

        if (fp == NULL) {
                /* errno - available in errno.h */
                errmsg = strerror(errno);
                printf("Error message=> %s\n", errmsg);
                return;
        }
        fclose(fp);
        return 0;
  }



  Output:
  jp@jp-VirtualBox:~/cpgms/chap2$ ls
  a.out  strerror.c
  jp@jp-VirtualBox:~/cpgms/chap2$ ./a.out jp.txt
  Error message=> No such file or directory



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