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Mon 14 Oct 23:09:15 CEST 2024

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sbosse 2024-10-14 23:09:52 +02:00
parent 7238a91977
commit 33e37fb872
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user/test/writebig.c Normal file
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/*
Copyright (C) 2016-2019 The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file LICENSE for details.
*/
/*
A trivial user level program to try out basic system calls.
*/
#include "library/syscalls.h"
#include "library/string.h"
#include "library/user-io.h"
int main(int argc, char *argv[])
{
syscall_chdir("/");
printf("got root\n");
int fd = syscall_open_file("kevin", 2, 0);
printf("got fd %d\n", fd);
printf("writing to file...\n");
for(int i = 0; i < 12; i++) {
char buffer[4096] = {'a'+i};
int n;
n = syscall_object_write(fd, buffer, strlen(buffer));
if(n < 0)
break;
printf("wrote %d chars: %s\n", n, buffer);
}
syscall_object_close(fd);
fd = syscall_open_file("kevin", 1, 0);
printf("reading file...\n");
for (int i = 0; i < 12; i++) {
char buffer[4096];
int n;
while((n = syscall_object_read(fd, buffer, 4096-1)) > 0) {
buffer[n] = 0;
printf("%s");
flush();
}
}
syscall_object_close(fd);
syscall_process_exit(0);
return 0;
}