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Fix POSIX syscall handling for consistency #77

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Merged
jserv merged 1 commit into from
Feb 4, 2026
Merged

Fix POSIX syscall handling for consistency #77

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24 changes: 6 additions & 18 deletions kernel/syscall.c
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Original file line number Diff line number Diff line change
Expand Up @@ -116,24 +116,12 @@ static int _getpid(void)
return 1;
}

/* linmo uses fixed heap via mo_heap_init, sbrk is not applicable */
static int _sbrk(int incr)
{
extern uint32_t _end, _stack;
static char *brk = (char *) &_end;
char *prev = brk;

if (unlikely(incr < 0)) {
errno = EINVAL;
return -1;
}

if (unlikely(brk + incr >= (char *) &_stack)) {
errno = ENOMEM;
return -1;
}

brk += incr;
return (int) prev;
(void) incr;
errno = ENOMEM;
return -1;
}

static int _usleep(int usec)
Expand Down Expand Up @@ -180,7 +168,7 @@ static int _read(int file, char *ptr, int len)
return -1;
}

if (unlikely(file < 0)) {
if (unlikely(file < 0 || file > 2)) {
errno = EBADF;
return -1;
}
Expand All @@ -199,7 +187,7 @@ static int _write(int file, char *ptr, int len)
return -1;
}

if (unlikely(file < 0)) {
if (unlikely(file < 0 || file > 2)) {
errno = EBADF;
return -1;
}
Expand Down
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