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0863a8eb29
This commit implements support for the glibc 2.35
posix_spawn_file_actions_addtcsetpgrp_np(3) extension[2][3],
updating spawnveg(3) to use the new function for setting the
terminal group. This was done with the intention of improving
performance in interactive shells without reintroducing previous
race conditions[4][5].
[1]: https://sourceware.org/pipermail/libc-alpha/2022-February/136040.html
[2]: https://sourceware.org/git/?p=glibc.git;a=commit;h=342cc934
[3]: https://sourceware.org/git/?p=glibc.git;a=commit;h=6289d28d
[4]: https://github.com/ksh93/ksh/issues/79
[5]: https://www.mail-archive.com/ast-developers@research.att.com/msg00717.html
src/cmd/ksh93/sh/path.c:
- Tell spawnveg(3) to set the terminal process group when launching
a child process in an interactive shell.
src/cmd/ksh93/sh/xec.c:
- If posix_spawn_file_actions_addtcsetpgrp_np(3) is available,
allow use of spawnveg(3) (via sh_ntfork()) even with job control
active.
- sh_ntfork(): Reimplement most of the SIGTSTP handling code
removed in commit 66c37202.
src/lib/libast/comp/spawnveg.c,
src/lib/libast/misc/procopen.c,
src/lib/libast/features/sys:
- Add support for posix_spawn_file_actions_addtcsetpgrp_np(3).
- Allow spawnveg to set the terminal process group when pgid == 0.
This was necessary to avoid race conditions when using the new
function.
src/lib/libast/features/lib:
- Detect posix_spawn_file_actions_addtcsetpgrp_np(3).
- Do not detect an OS spawnveg(3). With the API changes to spawnveg
in this pull request ksh probably can't use the OS's spawnveg
function anymore. (That's assuming anything else even provides a
spawnveg function to begin with, which is unlikely.)
src/lib/libast/features/api,
src/cmd/ksh93/include/defs.h:
- Bump libast version (20220101 => 20220201) due to the spawnveg(3)
API change.
src/lib/libast/man/spawnveg.3:
- Document the changes to spawnveg(3) in the corresponding man
page. Currently, it will only use the new tcfd argument if
posix_spawn_file_actions_addtcsetpgrp_np(3) is supported. This
could also be implemented for the fork(2) fallback, but for now
I've avoided changing that since actually using it in the fork
code would likely require a lot of hackery to avoid attempting
tcsetpgrp with vfork (the behavior of tcsetpgrp after vfork is
not portable) and would only benefit systems that don't have
posix_spawn and vfork (I can't recall any off the top of my head
that would fall under that category).
- Updated the man page to account for spawnveg's change in
behavior.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
238 lines
6.9 KiB
Text
238 lines
6.9 KiB
Text
iff AST_SYS
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ref -D_def_map_ast
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header stdlib.h
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header stddef.h
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header sys/types.h
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header stdint.h
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header inttypes.h
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header string.h
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header unistd.h
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header limits.h
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header fcntl.h
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header locale.h
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typ dev_t,nlink_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef short $v;"
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echo "#endif"
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}end
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typ gid_t,mode_t,uid_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef unsigned short $v;"
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echo "#endif"
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}end
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typ wchar_t stdio.h wchar.h fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef unsigned short $v;"
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echo "#endif"
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}end
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typ pid_t,ssize_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef int $v;"
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echo "#endif"
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}end
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typ wint_t stdio.h wchar.h fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef int $v;"
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echo "#endif"
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}end
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typ socklen_t sys/socket.h fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef int $v;"
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echo "#endif"
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}end
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typ size_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef unsigned int $v;"
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echo "#endif"
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}end
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typ clock_t,ino_t,off_t,ptrdiff_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef long $v;"
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echo "#endif"
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}end
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typ time_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef unsigned long $v;"
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echo "#endif"
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}end
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typ div_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef struct { int quot; int rem; } $v;"
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echo "#endif"
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}end
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typ ldiv_t fail{
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echo "#ifndef $m"
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echo "#define $m 1"
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echo "typedef struct { long quot; long rem; } $v;"
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echo "#endif"
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}end
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tst typ_signed_size_t output{
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#include <sys/types.h>
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int
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main()
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{
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unsigned long u = ~0;
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size_t s = ~0;
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if (s >= 0)
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return 1;
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printf("#if !defined(_typ_signed_size_t)\n/* ensure unsigned size_t */\ntypedef unsigned %s _ast_size_t;\n#undef\tsize_t\n#define size_t\t_ast_size_t\n#endif\n", u == (unsigned long)s ? "long" : "int");
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return 0;
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}
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}end
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define offsetof (type,member) __builtin_offsetof(type,member)
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define EXIT_FAILURE 1
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define EXIT_SUCCESS 0
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define MB_CUR_MAX 1
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define RAND_MAX 32767
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define STDIN_FILENO 0
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define STDOUT_FILENO 1
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define STDERR_FILENO 2
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define NULL 0
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define SEEK_SET 0
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define SEEK_CUR 1
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define SEEK_END 2
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define F_OK 0
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define X_OK 1
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define W_OK 2
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define R_OK 4
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print #if _BLD_ast && defined(__EXPORT__)
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print #define extern __EXPORT__
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print #endif
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extern _exit void (int)
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extern abort void (void)
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extern abs int (int)
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extern access int (const char*, int)
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extern alarm unsigned (unsigned)
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extern atexit int (void(*)(void))
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extern atof double (const char*)
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extern atoi int (const char*)
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extern atol long (const char*)
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extern bsearch void* (const void*, const void*, size_t, size_t, int(*)(const void*, const void*))
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extern calloc void* (size_t, size_t)
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extern cfree void (void*)
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extern chdir int (const char*)
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extern chown int (const char*, uid_t, gid_t)
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extern close int (int)
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extern confstr size_t (int, char*, size_t)
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extern div div_t (int, int)
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extern dup int (int)
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extern dup2 int (int, int)
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extern eaccess int (const char*, int)
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extern execl int (const char*, const char*, ...)
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extern execle int (const char*, const char*, ...)
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extern execlp int (const char*, const char*, ...)
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extern execv int (const char*, char* const[])
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extern execve int (const char*, char* const[], char* const[])
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extern execve int (const char*, char* const[], char* const[])
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extern execvp int (const char*, char* const[])
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extern execvpe int (const char*, char* const[], char* const[])
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extern exit void (int)
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extern fork pid_t (void)
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extern fpathconf long (int, int)
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extern free void (void*)
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extern fsync int (int)
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extern ftruncate int (int, off_t)
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extern getcwd char* (char*, size_t)
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extern getegid gid_t (void)
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extern getenv char* (const char*)
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extern geteuid uid_t (void)
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extern getgid gid_t (void)
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extern getgroups int (int, gid_t[])
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extern getlogin char* (void)
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extern getpgrp pid_t (void)
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extern getpid pid_t (void)
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extern getppid pid_t (void)
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extern gettxt char* (const char*, const char*)
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extern getuid uid_t (void)
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extern isatty int (int)
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extern labs long (long)
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extern ldiv ldiv_t (long, long)
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extern link int (const char*, const char*)
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extern lseek off_t (int, off_t, int)
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extern malloc void* (size_t)
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extern mblen int (const char*, size_t)
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extern mbstowcs size_t (wchar_t*, const char*, size_t)
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extern mbtowc int (wchar_t*, const char*, size_t)
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extern memalign void* (size_t, size_t)
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extern memccpy void* (void*, const void*, int, size_t)
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extern memchr void* (const void*, int, size_t)
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extern memcmp int (const void*, const void*, size_t)
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extern memcpy void* (void*, const void*, size_t)
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extern memmove void* (void*, const void*, size_t)
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extern memset void* (void*, int, size_t)
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extern pathconf long (const char*, int)
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extern pause int (void)
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extern pipe int (int[])
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extern pvalloc void* (size_t)
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extern qsort void (void*, size_t, size_t, int(*)(const void*, const void*))
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extern rand int (void)
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extern read ssize_t (int, void*, size_t)
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extern realloc void* (void*, size_t)
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extern realpath char* (const char*, char*)
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extern resolvepath char* (const char*, char*, size_t)
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extern rmdir int (const char*)
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extern setgid int (gid_t)
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extern setpgid int (pid_t, pid_t)
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extern setsid pid_t (void)
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extern setuid int (uid_t)
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extern sleep unsigned (unsigned int)
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extern spawnveg pid_t (const char*, char* const[], char* const[], pid_t, int)
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extern srand void (unsigned int)
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extern strcasecmp int (const char*, const char*)
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extern strcat char* (char*, const char*)
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extern strchr char* (const char*, int)
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extern strcmp int (const char*, const char*)
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extern strcoll int (const char*, const char*)
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extern strcpy char* (char*, const char*)
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extern strcspn size_t (const char*, const char*)
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extern strdup char* (const char*)
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extern strlcat size_t (char*, const char*, size_t)
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extern strlcpy size_t (char*, const char*, size_t)
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extern strlen size_t (const char*)
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extern strncasecmp int (const char*, const char*, size_t)
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extern strncat char* (char*, const char*, size_t)
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extern strncmp int (const char*, const char*, size_t)
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extern strncpy char* (char*, const char*, size_t)
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extern strpbrk char* (const char*, const char*)
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extern strrchr char* (const char*, int)
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extern strspn size_t (const char*, const char*)
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extern strstr char* (const char*, const char*)
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extern strtok char* (char*, const char*)
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extern strxfrm size_t (char*, const char*, size_t)
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extern swab void (const void*, void*, ssize_t)
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extern sysconf long (int)
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extern system int (const char*)
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extern tcgetpgrp pid_t (int)
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extern tcsetpgrp int (int, pid_t)
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extern truncate int (const char*, off_t)
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extern ttyname char* (int)
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extern unlink int (const char*)
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extern valloc void* (size_t)
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extern wcstombs size_t (char*, const wchar_t*, size_t)
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extern wctomb int (char*, wchar_t)
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extern write ssize_t (int, const void*, size_t)
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print #undef extern
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# <stdarg.h> is handled by proto so this must be after the last test
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print #include <stdarg.h>
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