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