banan-os/libc/unistd.cpp

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#include <BAN/Assert.h>
#include <kernel/Syscall.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
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#include <unistd.h>
char** environ;
extern "C" void _init_libc(char** _environ)
{
environ = _environ;
}
void _exit(int status)
{
syscall(SYS_EXIT, status);
ASSERT_NOT_REACHED();
}
long syscall(long syscall, ...)
{
va_list args;
va_start(args, syscall);
uintptr_t arg1 = va_arg(args, uintptr_t);
uintptr_t arg2 = va_arg(args, uintptr_t);
uintptr_t arg3 = va_arg(args, uintptr_t);
uintptr_t arg4 = va_arg(args, uintptr_t);
uintptr_t arg5 = va_arg(args, uintptr_t);
va_end(args);
long ret = Kernel::syscall(syscall, arg1, arg2, arg3, arg4, arg5);
if (ret < 0)
{
errno = -ret;
return -1;
}
return ret;
}
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int close(int fd)
{
return syscall(SYS_CLOSE, fd);
}
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ssize_t read(int fildes, void* buf, size_t nbyte)
{
return syscall(SYS_READ, fildes, buf, nbyte);
}
ssize_t write(int fildes, const void* buf, size_t nbyte)
{
return syscall(SYS_WRITE, fildes, buf, nbyte);
}
int dup(int fildes)
{
return syscall(SYS_DUP, fildes);
}
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int dup2(int fildes, int fildes2)
{
return syscall(SYS_DUP2, fildes, fildes2);
}
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int execl(const char* pathname, const char* arg0, ...)
{
if (arg0 == nullptr)
{
char* temp = nullptr;
return execv(pathname, &temp);
}
va_list ap;
va_start(ap, arg0);
int argc = 1;
while (va_arg(ap, const char*))
argc++;
va_end(ap);
char** argv = (char**)malloc(sizeof(char*) * (argc + 1));
if (argv == nullptr)
{
errno = ENOMEM;
return -1;
}
va_start(ap, arg0);
argv[0] = (char*)arg0;
for (int i = 1; i < argc; i++)
argv[i] = va_arg(ap, char*);
argv[argc] = nullptr;
va_end(ap);
return execv(pathname, argv);
}
int execle(const char* pathname, const char* arg0, ...)
{
va_list ap;
int argc = 0;
if (arg0)
{
va_start(ap, arg0);
argc = 1;
while (va_arg(ap, const char*))
argc++;
va_end(ap);
}
char** argv = (char**)malloc(sizeof(char*) * (argc + 1));
if (argv == nullptr)
{
errno = ENOMEM;
return -1;
}
char** envp = nullptr;
va_start(ap, arg0);
argv[0] = (char*)arg0;
for (int i = 1; i < argc; i++)
argv[i] = va_arg(ap, char*);
argv[argc] = nullptr;
envp = va_arg(ap, char**);
va_end(ap);
return execve(pathname, argv, envp);
}
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int execv(const char* pathname, char* const argv[])
{
return execve(pathname, argv, environ);
}
int execve(const char* pathname, char* const argv[], char* const envp[])
{
return syscall(SYS_EXEC, pathname, argv, envp);
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}
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pid_t fork(void)
{
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return syscall(SYS_FORK);
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}
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int pipe(int fildes[2])
{
return syscall(SYS_PIPE, fildes);
}
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unsigned int sleep(unsigned int seconds)
{
return syscall(SYS_SLEEP, seconds);
}
char* getcwd(char* buf, size_t size)
{
if (size == 0)
{
errno = EINVAL;
return nullptr;
}
if ((char*)syscall(SYS_GET_PWD, buf, size) == nullptr)
return nullptr;
setenv("PWD", buf, 1);
return buf;
}
int chdir(const char* path)
{
return syscall(SYS_SET_PWD, path);
}
pid_t getpid(void)
{
return syscall(SYS_GET_PID);
}
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uid_t getuid(void)
{
return syscall(SYS_GET_UID);
}
gid_t getgid(void)
{
return syscall(SYS_GET_GID);
}
uid_t geteuid(void)
{
return syscall(SYS_GET_EUID);
}
gid_t getegid(void)
{
return syscall(SYS_GET_EGID);
}
int seteuid(uid_t uid)
{
return syscall(SYS_SET_EUID, uid);
}
int setegid(gid_t gid)
{
return syscall(SYS_SET_EGID, gid);
}
int setuid(uid_t uid)
{
return syscall(SYS_SET_UID, uid);
}
int setgid(gid_t gid)
{
return syscall(SYS_SET_GID, gid);
}
int setreuid(uid_t ruid, uid_t euid)
{
return syscall(SYS_SET_REUID, ruid, euid);
}
int setregid(gid_t rgid, gid_t egid)
{
return syscall(SYS_SET_REGID, rgid, egid);
}
int tcsetpgrp(int fildes, pid_t pgid_id)
{
return syscall(SYS_TCSETPGRP, fildes, pgid_id);
}