These are a list of various unix system calls that are implemented in C. If you have any doubts, please let me know.
PROGRAM DEVELOPMENT
#include<stdio.h>
#include<dirent.h>
struct dirent *dptr;
void main(int argc, char *argv[])
{
char buff[100];
DIR *dirp;
printf("\n\nEnter Directory
Name: ");
scanf("%s",buff);
if((dirp=opendir(buff))==NULL)
{
printf("\n The given
directory does not exist\n");
exit(1);
}
while(dptr=readdir(dirp))
{
printf("%s\n",dptr->d_name);
}
closedir(dirp);
}
PROGRAM DEVELOPMENT
#include<stdio.h>
#include<unistd.h>
main()
{
int pid,pid1,pid2;
pid=fork();
if(pid==-1)
{
printf("ERROR IN PROCESS
CREATION\n");
exit(1);
}
if(pid!=0)
{
pid1=getpid();
printf("\nThe parent
process id is %d\n",pid1);
}
else
{
pid2=getpid();
printf("\nThe child
process id is %d\n",pid2);
}
}
PROGRAM DEVELOPMENT
#include<stdio.h>
int main()
{
int fd;
if((fd=open("file.dat"))==-1)
{
perror("cannot open the
file.dat");
exit(0);
}
else
printf("\nFILE OPENED
SUCCESSFULLY");
return 0;
}
PROGRAM DEVELOPMENT
#include<stdio.h>
main()
{
char b[20];
int fd,xr;
if((fd=open("balaji",0))==-1)
{
printf("Cannot open
file\n");
exit(1);
}
do
{
xr=read(fd,b,20);
b[xr]='\0';
printf("%s",b);
}
while(xr==20);
close(fd);
}
PROGRAM DEVELOPMENT
#include<stdio.h>
main(int ac,char *av[])
{
int fd;
int i=1,j=0;
char *sep="";
printf("%s",av[1]);
if(ac<1)
{
printf("\n INSUFFICIENT
ARGUMENTS");
exit(1);
}
if((fd=open("balaji",0660))==-1)
{
printf("\n cannot create
the file");
exit(1);
}
while(i<ac)
{
j=write(fd,av[i],(unsigned)strlen(av[i]));
printf("%d",j);
write(fd,sep,(unsigned)strlen(sep));
i++;
}
close(fd);
}
PROGRAM DEVELOPMENT
#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
int main()
{
int s;
struct stat st;
s=stat("sss.c",&st);
if(s<0)
{
printf("use of stat() is
unsuccessful\n");
exit(0);
}
printf("\ninode number of
sss.c file is %d",st.st_ino);
printf("\nnumber of links
to sss.c is %d",st.st_nlink);
printf("\nfile permissions
of sss.c file is %d",st.st_mode);
printf("\nsize of sss.c
file is %d",st.st_size);
printf("\nlast access time
of sss.c file is %d\n",st.st_atime);
}
