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Fix bugs in termios library and cleanup code

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This change fixes an issue with the tcflow() magic numbers that was
causing bash to freeze up on Linux. While auditing termios polyfills,
several other issues were identified with XNU/BSD compatibility.

Out of an abundance of caution this change undefines as much surface
area from libc/calls/struct/termios.h as possible, so that autoconf
scripts are less likely to detect non-POSIX teletypewriter APIs that
haven't been polyfilled by Cosmopolitan.

This is a *breaking change* for your static archives in /opt/cosmos if
you use the cosmocc toolchain. That's because this change disables the
ioctl() undiamonding trick for code outside the monorepo, specifically
because it'll lead to brittle ABI breakages like this. If you're using
the cosmocc toolchain, you'll need to rebuild libraries like ncurses,
readline, etc. Yes diamonds cause bloat. To work around that, consider
using tcgetwinsize() instead of ioctl(TIOCGWINSZ) since it'll help you
avoid pulling every single ioctl-related polyfill into the linkage.

The cosmocc script was specifying -DNDEBUG for some reason. It's fixed.
This commit is contained in:
Justine Tunney 2023-06-14 17:02:57 -07:00
parent 06b749ae03
commit 4778cd4d27
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
187 changed files with 1025 additions and 1848 deletions
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21
libc/calls/struct/termios.h
View file

@ -1,20 +1,21 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_STRUCT_TERMIOS_H_
#define COSMOPOLITAN_LIBC_CALLS_STRUCT_TERMIOS_H_
#define NCCS 20
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
struct termios { /* GNU/Systemd ABI */
uint32_t c_iflag; /* input modes */
uint32_t c_oflag; /* output modes */
uint32_t c_cflag; /* control modes */
uint32_t c_lflag; /* local modes */
uint8_t c_cc[20]; /* code mappings */
uint32_t c_ispeed; /* input speed */
uint32_t c_ospeed; /* output speed */
struct termios { /* cosmo abi */
uint32_t c_iflag; /* input modes */
uint32_t c_oflag; /* output modes */
uint32_t c_cflag; /* control modes */
uint32_t c_lflag; /* local modes */
uint8_t c_cc[NCCS]; /* code mappings */
uint32_t _c_ispeed; /* use cfgetispeed() and cfsetispeed() */
uint32_t _c_ospeed; /* use cfgetospeed() and cfsetospeed() */
};
#define c_line c_cc[0] /* line discipline */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_TERMIOS_H_ */