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Define an __errno_location function. (#347)

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This function returns the address of `errno`, which makes it easier to
access from non-C languages since `errno` is a thread-local variable
which requires a special ABI.
This commit is contained in:
Dan Gohman 2022-11-28 13:50:04 -08:00 committed by GitHub
parent a00bf321ee
commit 2bb5abedbd
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3 changed files with 7 additions and 0 deletions
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1
expected/wasm32-wasi/posix/defined-symbols.txt
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@ -48,6 +48,7 @@ __do_des
__do_orphaned_stdio_locks __do_orphaned_stdio_locks
__duplocale __duplocale
__env_rm_add __env_rm_add
__errno_location
__exp2f_data __exp2f_data
__exp_data __exp_data
__expo2 __expo2

1
expected/wasm32-wasi/single/defined-symbols.txt
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@ -38,6 +38,7 @@ __des_setkey
__do_des __do_des
__duplocale __duplocale
__env_rm_add __env_rm_add
__errno_location
__exp2f_data __exp2f_data
__exp_data __exp_data
__expo2 __expo2

5
libc-bottom-half/sources/__errno_location.c Normal file
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@ -0,0 +1,5 @@
#include <errno.h>
int *__errno_location(void) {
return &errno;
}