463 lines
7.5 KiB
C++
463 lines
7.5 KiB
C++
#include <BAN/Assert.h>
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#include <kernel/Syscall.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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char** environ;
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extern void init_malloc();
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extern "C" void _init_libc(char** _environ)
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{
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init_malloc();
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if (!_environ)
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return;
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size_t env_count = 0;
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while (_environ[env_count])
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env_count++;
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environ = (char**)malloc(sizeof(char*) * env_count + 1);
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for (size_t i = 0; i < env_count; i++)
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{
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size_t bytes = strlen(_environ[i]) + 1;
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environ[i] = (char*)malloc(bytes);
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memcpy(environ[i], _environ[i], bytes);
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}
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environ[env_count] = nullptr;
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}
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void _exit(int status)
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{
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syscall(SYS_EXIT, status);
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ASSERT_NOT_REACHED();
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}
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long syscall(long syscall, ...)
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{
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va_list args;
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va_start(args, syscall);
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uintptr_t arg1 = va_arg(args, uintptr_t);
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uintptr_t arg2 = va_arg(args, uintptr_t);
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uintptr_t arg3 = va_arg(args, uintptr_t);
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uintptr_t arg4 = va_arg(args, uintptr_t);
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uintptr_t arg5 = va_arg(args, uintptr_t);
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va_end(args);
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long ret = Kernel::syscall(syscall, arg1, arg2, arg3, arg4, arg5);
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if (ret < 0)
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{
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errno = -ret;
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return -1;
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}
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return ret;
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}
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int close(int fd)
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{
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return syscall(SYS_CLOSE, fd);
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}
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ssize_t read(int fildes, void* buf, size_t nbyte)
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{
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return syscall(SYS_READ, fildes, buf, nbyte);
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}
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ssize_t write(int fildes, const void* buf, size_t nbyte)
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{
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return syscall(SYS_WRITE, fildes, buf, nbyte);
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}
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ssize_t readlink(const char* __restrict path, char* __restrict buf, size_t bufsize)
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{
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return syscall(SYS_READLINK, path, buf, bufsize);
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}
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ssize_t readlinkat(int fd, const char* __restrict path, char* __restrict buf, size_t bufsize)
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{
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return syscall(SYS_READLINKAT, fd, path, buf, bufsize);
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}
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ssize_t pread(int fildes, void* buf, size_t nbyte, off_t offset)
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{
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return syscall(SYS_PREAD, fildes, buf, nbyte, offset);
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}
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int dup(int fildes)
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{
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return syscall(SYS_DUP, fildes);
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}
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int dup2(int fildes, int fildes2)
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{
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return syscall(SYS_DUP2, fildes, fildes2);
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}
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int execl(const char* pathname, const char* arg0, ...)
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{
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if (arg0 == nullptr)
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{
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char* temp = nullptr;
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return execv(pathname, &temp);
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}
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va_list ap;
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va_start(ap, arg0);
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int argc = 1;
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while (va_arg(ap, const char*))
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argc++;
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va_end(ap);
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char** argv = (char**)malloc(sizeof(char*) * (argc + 1));
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if (argv == nullptr)
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{
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errno = ENOMEM;
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return -1;
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}
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va_start(ap, arg0);
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argv[0] = (char*)arg0;
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for (int i = 1; i < argc; i++)
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argv[i] = va_arg(ap, char*);
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argv[argc] = nullptr;
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va_end(ap);
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return execv(pathname, argv);
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}
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int execle(const char* pathname, const char* arg0, ...)
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{
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va_list ap;
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int argc = 0;
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if (arg0)
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{
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va_start(ap, arg0);
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argc = 1;
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while (va_arg(ap, const char*))
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argc++;
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va_end(ap);
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}
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char** argv = (char**)malloc(sizeof(char*) * (argc + 1));
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if (argv == nullptr)
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{
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errno = ENOMEM;
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return -1;
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}
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char** envp = nullptr;
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va_start(ap, arg0);
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argv[0] = (char*)arg0;
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for (int i = 1; i < argc; i++)
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argv[i] = va_arg(ap, char*);
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argv[argc] = nullptr;
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envp = va_arg(ap, char**);
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va_end(ap);
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return execve(pathname, argv, envp);
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}
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int execv(const char* pathname, char* const argv[])
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{
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return execve(pathname, argv, environ);
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}
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int execve(const char* pathname, char* const argv[], char* const envp[])
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{
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return syscall(SYS_EXEC, pathname, argv, envp);
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}
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int execvp(const char* file, char* const argv[])
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{
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char buffer[1024];
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const char* pathname = NULL;
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// do path resolution if file doesn't contain /
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if (strchr(file, '/') == nullptr)
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{
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const char* cur = getenv("PATH");
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if (!cur)
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{
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errno = ENOENT;
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return -1;
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}
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while (*cur)
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{
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const char* end = strchrnul(cur, ':');
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size_t len = end - cur;
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ASSERT(strlen(file) + 1 + len < sizeof(buffer));
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strncpy(buffer, cur, len);
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strcat(buffer, "/");
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strcat(buffer, file);
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struct stat st;
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if (stat(buffer, &st) == 0)
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{
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pathname = buffer;
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break;
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}
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cur = end;
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if (*cur)
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cur++;
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}
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}
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else
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{
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pathname = file;
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}
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if (!pathname)
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{
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errno = ENOENT;
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return -1;
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}
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return execve(pathname, argv, environ);
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}
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pid_t fork(void)
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{
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return syscall(SYS_FORK);
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}
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int pipe(int fildes[2])
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{
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return syscall(SYS_PIPE, fildes);
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}
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unsigned int sleep(unsigned int seconds)
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{
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unsigned int ret = syscall(SYS_SLEEP, seconds);
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if (ret > 0)
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errno = EINTR;
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return ret;
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}
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char* getcwd(char* buf, size_t size)
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{
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if (size == 0)
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{
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errno = EINVAL;
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return nullptr;
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}
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if ((char*)syscall(SYS_GET_PWD, buf, size) == nullptr)
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return nullptr;
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setenv("PWD", buf, 1);
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return buf;
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}
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int chdir(const char* path)
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{
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return syscall(SYS_SET_PWD, path);
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}
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int chown(const char* path, uid_t owner, gid_t group)
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{
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return syscall(SYS_CHOWN, path, owner, group);
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}
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void sync(void)
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{
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syscall(SYS_SYNC, false);
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}
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void syncsync(int should_block)
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{
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syscall(SYS_SYNC, should_block);
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}
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int unlink(const char* path)
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{
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return syscall(SYS_UNLINK, path);
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}
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int rmdir(const char* path)
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{
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return syscall(SYS_UNLINK, path);
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}
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char* optarg = nullptr;
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int opterr = 1;
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int optind = 1;
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int optopt = 0;
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int getopt(int argc, char* const argv[], const char* optstring)
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{
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if (optind >= argc)
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return -1;
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static int idx = 1;
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const char* current = argv[optind];
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// if "--" is encountered, no more options are parsed
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if (idx == -1)
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return -1;
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// if current is nullptr, does not start with '-' or is string "-", return -1
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if (current == nullptr || current[0] != '-' || current[1] == '\0')
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return -1;
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// if current points to string "--" increment optind and return -1
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if (current[1] == '-' && current[2] == '\0')
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{
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idx = -1;
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optind++;
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return -1;
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}
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for (size_t i = 0; optstring[i]; i++)
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{
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if (optstring[i] == ':')
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continue;
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if (current[idx] != optstring[i])
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continue;
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if (optstring[i + 1] == ':')
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{
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if (current[idx + 1])
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{
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optarg = const_cast<char*>(current + idx + 1);
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optind += 1;
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}
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else
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{
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optarg = const_cast<char*>(argv[optind + 1]);
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optind += 2;
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}
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idx = 1;
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if (optind > argc)
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{
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if (opterr && optstring[0] != ':')
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fprintf(stderr, "%s: option requires an argument -- %c\n", argv[0], optstring[i]);
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optopt = optstring[i];
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return optstring[0] == ':' ? ':' : '?';
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}
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return optstring[i];
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}
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else
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{
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if (current[++idx] == '\0')
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{
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idx = 1;
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optind++;
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}
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return optstring[i];
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}
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}
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if (opterr && optstring[0] != ':')
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fprintf(stderr, "%s: illegal option -- %c\n", argv[0], current[idx]);
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if (current[++idx] == '\0')
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{
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idx = 1;
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optind++;
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}
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return '?';
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}
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pid_t getpid(void)
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{
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return syscall(SYS_GET_PID);
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}
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uid_t getuid(void)
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{
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return syscall(SYS_GET_UID);
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}
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gid_t getgid(void)
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{
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return syscall(SYS_GET_GID);
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}
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uid_t geteuid(void)
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{
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return syscall(SYS_GET_EUID);
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}
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gid_t getegid(void)
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{
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return syscall(SYS_GET_EGID);
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}
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pid_t getpgrp(void)
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{
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return getpgid(0);
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}
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pid_t getpgid(pid_t pid)
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{
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return syscall(SYS_GET_PGID, pid);
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}
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int seteuid(uid_t uid)
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{
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return syscall(SYS_SET_EUID, uid);
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}
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int setegid(gid_t gid)
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{
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return syscall(SYS_SET_EGID, gid);
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}
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int setuid(uid_t uid)
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{
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return syscall(SYS_SET_UID, uid);
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}
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int setgid(gid_t gid)
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{
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return syscall(SYS_SET_GID, gid);
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}
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int setreuid(uid_t ruid, uid_t euid)
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{
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return syscall(SYS_SET_REUID, ruid, euid);
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}
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int setregid(gid_t rgid, gid_t egid)
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{
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return syscall(SYS_SET_REGID, rgid, egid);
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}
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pid_t setpgrp(void)
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{
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setpgid(0, 0);
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return getpgrp();
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}
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int setpgid(pid_t pid, pid_t pgid)
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{
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return syscall(SYS_SET_PGID, pid, pgid);
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}
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int tcsetpgrp(int fildes, pid_t pgid_id)
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{
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return syscall(SYS_TCSETPGRP, fildes, pgid_id);
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}
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