Using C language to use system calls Post: 302734105

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Homework and Emergencies Homework & Coursework Questions Using C language to use system calls Post 302734105 by femchi on Wednesday 21st of November 2012 03:09:13 PM

11-21-2012

Registered User

Using C language to use system calls

I need to write a C program (not a C++ program) that allows some tasks to be preformed automatically from a menu-driven interface. Automate the following tasks:
1. Rename a file
2. Delete a file or a directory
3. Output Process Information
4. Execute �mode 644 ls -l�
5. Exit

I need to know what steps should I follow to achieve the result. is it possible to ask the user to enter all the names and commands in 1 line or I should ask him one by one.
thank you

Code:

#include <stdio.h>
#include <fcntl.h>
#include <sys/errno.h>

int main (void) 
{
	int ch;
	char oldfn;
	char newfn;
	
	printf("\tMenu:\n");
	printf("\t1: Rename a file\n");
	printf("\t2: Delete a file or a directory\n");
	printf("\t3: Output Process Information\n");
	printf("\t4: Execute \"mode 644 ls -l\"\n");
	printf("\t5: Exit\n");
	printf("\t Enter your choice: \n");
	scanf("%d",&ch); 
	do
	{
		switch (ch)
		{
			case 1:printf("Enter the name of file and the new name :\n");
			printf("old file name: ");
			scanf("%s",&oldfn);
			printf("new file name: ");
			scanf("%s",&newfn);
			if ( rename(const char *oldfn, const char *newfn) == 0  )
			{
				printf("file is renamed");
			}
			break;
			case 2:printf("case 2\n");
			break;
			case 3:printf("case 3\n");
			break;
			case 4:printf("case 4\n");
			break;
			case 5:printf("exit\n");
			break;
			default:printf("Enter a number between 1-5\n");
			exit(0);
		}
		scanf("%d",&ch);
		
	}
	while ((ch>=1)||(ch<=5));
		
}

Langara college, Vancouver, Canada - Miss Hengame Hamavand - CPSC 1280

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new_printf_comp

XPRINTF_COMP(3) 					   BSD Library Functions Manual 					   XPRINTF_COMP(3)

NAME

     free_printf_comp, new_printf_comp -- extensible printf compilation

SYNOPSIS

     #include <printf.h>

     void
     free_printf_comp(printf_comp_t pc);

     printf_comp_t
     new_printf_comp(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict fmt);

DESCRIPTION

     To ameliorate some of the slowness caused by the extra overhead in extensible printf (see xprintf(5)), a compile/execute mechanism has been
     created.  The new_printf_comp() function compiles the given format string, along with a printf domain (see xprintf_domain(3)) and an extended
     locale (see xlocale(3)), and returns a printf_comp_t structure.  The domain may not be NULL, but the locale can be NULL, which means to use
     the current locale, either the per-thread locale if it was set, or else the global locale.  Because the printf_comp_t structure records the
     domain and locale, care should be taken if either of these are changed.

     Once a printf_comp_t structure is created, it can be passed to one of the extensible printf execution variants, described in xprintf_exec(3),
     along with the necessary arguments.  Creating the printf_comp_t structure needs to be done only once, but it can be passed to extensible
     printf execution variants any number of times.

     When the printf_comp_t structure is no longer needed, it should be passed to free_printf_comp() to release internal memory.

RETURN VALUES

     The new_printf_comp() function returns the new structure, or NULL on error (usually NULL domain or out of memory condition).

SEE ALSO

     xlocale(3), xprintf_domain(3), xprintf_exec(3), xprintf(5)

Darwin								   Aug 19, 2012 							    Darwin