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https://github.com/RGBCube/serenity
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Implement errno in LibC.
This also meant I had to implement BSS (SHT_NOBITS) sections in ELFLoader. I also added an strerror() so we can print out what the errors are.
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434b6a8688
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260b14e505
14 changed files with 209 additions and 27 deletions
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@ -2,8 +2,12 @@
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extern "C" int main(int, char**);
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int errno;
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extern "C" int _start()
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{
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errno = 0;
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// FIXME: Pass appropriate argc/argv.
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int status = main(0, nullptr);
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57
LibC/errno.h
Normal file
57
LibC/errno.h
Normal file
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@ -0,0 +1,57 @@
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#pragma once
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#define EPERM 1 // Operation not permitted
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#define ENOENT 2 // No such file or directory
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#define ESRCH 3 // No such process
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#define EINTR 4 // Interrupted system call
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#define EIO 5 // I/O error
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#define ENXIO 6 // No such device or address
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#define E2BIG 7 // Argument list too long
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#define ENOEXEC 8 // Exec format error
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#define EBADF 9 // Bad file number
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#define ECHILD 10 // No child processes
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#define EAGAIN 11 // Try again
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#define ENOMEM 12 // Out of memory
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#define EACCES 13 // Permission denied
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#define EFAULT 14 // Bad address
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#define ENOTBLK 15 // Block device required
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#define EBUSY 16 // Device or resource busy
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#define EEXIST 17 // File exists
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#define EXDEV 18 // Cross-device link
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#define ENODEV 19 // No such device
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#define ENOTDIR 20 // Not a directory
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#define EISDIR 21 // Is a directory
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#define EINVAL 22 // Invalid argument
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#define ENFILE 23 // File table overflow
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#define EMFILE 24 // Too many open files
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#define ENOTTY 25 // Not a typewriter
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#define ETXTBSY 26 // Text file busy
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#define EFBIG 27 // File too large
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#define ENOSPC 28 // No space left on device
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#define ESPIPE 29 // Illegal seek
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#define EROFS 30 // Read-only file system
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#define EMLINK 31 // Too many links
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#define EPIPE 32 // Broken pipe
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#define EDOM 33 // Math argument out of domain of func
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#define ERANGE 34 // Math result not representable
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#define EOVERFLOW 75 // Value too large for defined data type
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#define __RETURN_WITH_ERRNO(rc, good_ret, bad_ret) \
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do { \
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if (rc < 0) { \
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errno = -rc; \
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return (bad_ret); \
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} else { \
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errno = 0; \
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return (good_ret); \
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} \
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} while(0)
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extern "C" {
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extern int errno;
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};
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@ -1,16 +1,19 @@
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#include "mman.h"
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#include "errno.h"
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#include <Kernel/Syscall.h>
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extern "C" {
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void* mmap(void* addr, size_t size)
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{
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return (void*)Syscall::invoke(Syscall::PosixMmap, (dword)addr, (dword)size);
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int rc = Syscall::invoke(Syscall::PosixMmap, (dword)addr, (dword)size);
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__RETURN_WITH_ERRNO(rc, (void*)rc, (void*)-1);
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}
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int munmap(void* addr, size_t size)
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{
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return Syscall::invoke(Syscall::PosixMunmap, (dword)addr, (dword)size);
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int rc = Syscall::invoke(Syscall::PosixMunmap, (dword)addr, (dword)size);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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@ -1,11 +1,13 @@
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#include "process.h"
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#include "errno.h"
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#include <Kernel/Syscall.h>
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extern "C" {
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int spawn(const char* path)
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{
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return Syscall::invoke(Syscall::Spawn, (dword)path);
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int rc = Syscall::invoke(Syscall::Spawn, (dword)path);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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@ -1,4 +1,6 @@
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#include "string.h"
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#include "errno.h"
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#include "stdio.h"
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extern "C" {
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@ -10,5 +12,49 @@ size_t strlen(const char* str)
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return len;
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}
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const char* strerror(int errnum)
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{
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switch (errnum) {
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case 0: return "No error";
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case EPERM: return "Operation not permitted";
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case ENOENT: return "No such file or directory";
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case ESRCH: return "No such process";
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case EINTR: return "Interrupted syscall";
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case EIO: return "I/O error";
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case ENXIO: return "No such device/address";
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case E2BIG: return "Argument list too long";
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case ENOEXEC: return "Exec format error";
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case EBADF: return "Bad fd number";
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case ECHILD: return "No child processes";
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case EAGAIN: return "Try again";
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case ENOMEM: return "Out of memory";
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case EACCES: return "Access denied";
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case EFAULT: return "Bad address";
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case ENOTBLK: return "Not a block device";
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case EBUSY: return "Resource busy";
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case EEXIST: return "File already exists";
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case EXDEV: return "Cross-device link";
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case ENODEV: return "No such device";
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case ENOTDIR: return "Not a directory";
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case EISDIR: return "Is a directory";
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case EINVAL: return "Invalid argument";
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case ENFILE: return "File table overflow";
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case EMFILE: return "Too many open files";
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case ENOTTY: return "Not a TTY";
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case ETXTBSY: return "Text file busy";
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case EFBIG: return "File too big";
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case ENOSPC: return "No space left";
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case ESPIPE: return "Illegal seek";
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case EROFS: return "File system is read-only";
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case EMLINK: return "Too many links";
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case EPIPE: return "Broken pipe";
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case EDOM: return "Math argument out of domain";
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case ERANGE: return "Math result not representable";
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case EOVERFLOW: return "Value too large for data type";
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}
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printf("strerror() missing string for errnum=%d\n", errnum);
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return "Unknown error";
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}
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}
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@ -5,6 +5,7 @@
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extern "C" {
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size_t strlen(const char*);
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const char* strerror(int errnum);
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}
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@ -1,5 +1,6 @@
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#include "unistd.h"
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#include "string.h"
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#include "errno.h"
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#include <Kernel/Syscall.h>
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extern "C" {
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int open(const char* path)
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{
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size_t length = strlen(path);
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return Syscall::invoke(Syscall::PosixOpen, (dword)path, (dword)length);
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int rc = Syscall::invoke(Syscall::PosixOpen, (dword)path, (dword)length);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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ssize_t read(int fd, void* buf, size_t count)
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{
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return Syscall::invoke(Syscall::PosixRead, (dword)fd, (dword)buf, (dword)count);
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int rc = Syscall::invoke(Syscall::PosixRead, (dword)fd, (dword)buf, (dword)count);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int close(int fd)
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{
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return Syscall::invoke(Syscall::PosixClose, fd);
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int rc = Syscall::invoke(Syscall::PosixClose, fd);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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pid_t waitpid(pid_t waitee)
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{
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return Syscall::invoke(Syscall::PosixWaitpid, waitee);
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int rc = Syscall::invoke(Syscall::PosixWaitpid, waitee);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int lstat(const char* path, stat* statbuf)
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{
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return Syscall::invoke(Syscall::PosixLstat, (dword)path, (dword)statbuf);
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int rc = Syscall::invoke(Syscall::PosixLstat, (dword)path, (dword)statbuf);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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char* getcwd(char* buffer, size_t size)
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{
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int rc = Syscall::invoke(Syscall::PosixGetcwd, (dword)buffer, (dword)size);
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if (rc != 0)
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return nullptr;
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return buffer;
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__RETURN_WITH_ERRNO(rc, buffer, nullptr);
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}
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}
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