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lib: c: add fallback errno storage for single-threaded programs

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max 🍓
2026-03-22 19:11:25 +00:00
parent a792bbe5db
commit 7b89a038a2
2 changed files with 14 additions and 0 deletions
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10
lib/libc/core/errno/errno.c
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@@ -1,6 +1,15 @@
#include <errno.h> #include <errno.h>
#include <mango/log.h>
#include <mango/status.h> #include <mango/status.h>
static int __errno = 32;
int __attribute__((weak)) * __errno_location(void)
{
kern_log("using builtin errno");
return &__errno;
}
#if defined(BUILD_STATIC) #if defined(BUILD_STATIC)
int __set_errno(int err) int __set_errno(int err)
{ {
@@ -12,6 +21,7 @@ int __set_errno(int err)
int __set_errno(int err) int __set_errno(int err)
{ {
/* TODO */ /* TODO */
*__errno_location() = err;
return -1; return -1;
} }
#endif #endif

4
lib/libc/include/errno.h
View File

@@ -1,6 +1,8 @@
#ifndef ERRNO_H_ #ifndef ERRNO_H_
#define ERRNO_H_ #define ERRNO_H_
#define errno (*__errno_location())
#define SUCCESS 0 /* Success */ #define SUCCESS 0 /* Success */
#define EPERM 1 /* Operation not permitted */ #define EPERM 1 /* Operation not permitted */
#define ENOENT 2 /* No such file or directory */ #define ENOENT 2 /* No such file or directory */
@@ -142,4 +144,6 @@
extern int __set_errno(int err); extern int __set_errno(int err);
extern int __errno_from_kern_status(unsigned int err); extern int __errno_from_kern_status(unsigned int err);
extern int __attribute__((weak)) * __errno_location(void);
#endif #endif