How to delete a file without using remove system call in a C program?
int unlink (const char *filename)The unlink function deletes the file name filename. The function unlink is declared in the header file unistd.h. This function returns 0 on successful completion, and -1 on error
If you want to delete a file use the
removefunction. If you want to have a look behind the scenes of the standard library, you may download the source of the glibc (e.g.) and have a look at the implementation. You will see that actually a INTERNAL_SYSCALL will be performed on linux os:
result = INTERNAL_SYSCALL (unlink, err, 1, file);(from /sysdeps/unix/sysv/linux/unlinkat.c from the debian eglibc-2.15 package)
If you want to go further and even not use that syscall you will have to implement your own file system logic since the file system syscall just gives an abstraction layer to different filesystems.
If you don't want to use the clean, usual way, you can open /dev/sd** and play with your file system.
Btw, remove() isn't a syscall (man 3 remove).