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#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/mman.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include "test.h"
int main() {
// Write to standard output
const char *msg = "Hello, world!\n";
syscall(SYS_write, STDOUT_FILENO, msg, 14);
// Read from standard input
// char buffer[128];
// ssize_t bytesRead = syscall(SYS_read, STDIN_FILENO, buffer, sizeof(buffer) - 1);
// if (bytesRead >= 0) {
// buffer[bytesRead] = '\0';
// printf("Read: %s\n", buffer);
// }
// Open a file and read from it
int fd = syscall(SYS_open, "test.txt", O_RDONLY);
if (fd >= 0) {
char buffer[128];
ssize_t bytesRead = syscall(SYS_read, fd, buffer, sizeof(buffer) - 1);
if (bytesRead >= 0) {
buffer[bytesRead] = '\0';
printf("Read from file: %s\n", buffer);
}
syscall(SYS_close, fd);
}
// Get the process ID
pid_t pid = syscall(SYS_getpid);
printf("Process ID: %d\n", pid);
// Fork a child process
pid = syscall(SYS_fork);
if (pid == 0) {
printf("This is the child process\n");
} else if (pid > 0) {
printf("This is the parent process, child PID: %d\n", pid);
} else {
printf("Fork failed\n");
}
//Execute a program
// char *argv[] = { "/bin/ls", "-l", NULL };
// char *envp[] = { NULL };
// syscall(SYS_execve, "/bin/ls", argv, envp);
// Map a file into memory
fd = syscall(SYS_open, "test.txt", O_RDONLY);
if (fd >= 0) {
char *data = syscall(SYS_mmap, NULL, 4096, PROT_READ, MAP_PRIVATE, fd, 0);
if (data != MAP_FAILED) {
printf("Mapped data: %s\n", data);
syscall(SYS_munmap, data, 4096);
}
syscall(SYS_close, fd);
}
// Kill a process
// pid = syscall(SYS_getpid);
// syscall(SYS_kill, pid, SIGTERM);
// Get the current time
struct timeval tv;
syscall(SYS_gettimeofday, &tv, NULL);
printf("Seconds: %ld\nMicroseconds: %ld\n", tv.tv_sec, tv.tv_usec);
// Get system information
struct utsname bufferinfo;
if (syscall(SYS_uname, &bufferinfo) == 0) {
printf("System name: %s\n", bufferinfo.sysname);
printf("Node name: %s\n", bufferinfo.nodename);
printf("Release: %s\n", bufferinfo.release);
printf("Version: %s\n", bufferinfo.version);
printf("Machine: %s\n", bufferinfo.machine);
Assert("x86_64", bufferinfo.machine);
Assert("Linux", bufferinfo.sysname);
} else {
perror("syscall(SYS_uname) failed");
}
// Get the current user and group IDs
uid_t uid = syscall(SYS_getuid);
printf("User ID: %d\n", uid);
gid_t gid = syscall(SYS_getgid);
printf("Group ID: %d\n", gid);
// Exit the process
syscall(SYS_exit, 0);
}
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