this is my code and no matter what record number the user enters i cant get any of the records fields to read into the structure acct. What am i doing wrong?
Code:
#include <stdio.h>
typedef struct
{
char name[40];
int number;
float balance;
} acct_info_t;
int main (int argc, char *argv[])
{
FILE *ptr_acctfile;
acct_info_t acct;
ptr_acctfile = fopen("/accounts/facstaff/bhatias/cs2750/acct_info", "rb");
if (!ptr_acctfile)
{
printf("Unable to open file!\n");
return 1;
}
printf("Enter a record number: ");
int recnum;
scanf("%d", &recnum);
fseek(ptr_acctfile, sizeof(acct_info_t)*recnum, SEEK_SET);
fread(&acct, sizeof(acct_info_t), 1, ptr_acctfile);
printf("%s, %d\n", acct.name, acct.balance);
fclose(ptr_acctfile);
return 0;
}
ok also i guess im getting odd results since there are 2 integers i have to acount for in the beggining of the file. how would i get past these with an fseek?
Moderator's Comments:
homework and classwork belong in the homework forum, please post there
Last edited by jim mcnamara; 04-16-2012 at 11:31 PM..
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LEARN ABOUT OPENDARWIN
acct
ACCT(2) BSD System Calls Manual ACCT(2)NAME
acct -- enable or disable process accounting
SYNOPSIS
#include <unistd.h>
int
acct(const char *file);
DESCRIPTION
The acct() call enables or disables the collection of system accounting records. If the argument file is a nil pointer, accounting is dis-
abled. If file is an existing pathname (null-terminated), record collection is enabled and for every process initiated which terminates
under normal conditions an accounting record is appended to file. Abnormal conditions of termination are reboots or other fatal system prob-
lems. Records for processes which never terminate can not be produced by acct().
For more information on the record structure used by acct(), see /usr/include/sys/acct.h and acct(5).
This call is permitted only to the super-user.
NOTES
Accounting is automatically disabled when the file system the accounting file resides on runs out of space; it is enabled when space once
again becomes available.
RETURN VALUES
On error -1 is returned. The file must exist and the call may be exercised only by the super-user.
ERRORS
Acct() will fail if one of the following is true:
[EPERM] The caller is not the super-user.
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the path prefix, or the path name is not a regular file.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EROFS] The named file resides on a read-only file system.
[EFAULT] File points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.
SEE ALSO acct(5), sa(8)HISTORY
An acct() function call appeared in Version 7 AT&T UNIX.
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
04-16-2012
