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Greatly expand system() shell code features

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The cosmopolitan command interpreter now has 13 builtin commands,
variable support, support for ; / && / || syntax, asynchronous support,
and plenty of unit tests with bug fixes.

This change fixes a bug in posix_spawn() with null envp arg. strace
logging now uses atomic writes for scatter functions. Breaking change
renaming GetCpuCount() to _getcpucount(). TurfWar is now updated to use
the new token bucket algorithm. WIN32 affinity masks now inherit across
fork() and execve().
This commit is contained in:
Justine Tunney 2022-10-11 21:06:27 -07:00
parent e7329b7cba
commit b41f91c658
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GPG key ID: BE714B4575D6E328
80 changed files with 1370 additions and 344 deletions
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29
libc/stdio/popen.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/paths.h"
@ -31,14 +32,8 @@
/**
* Spawns subprocess and returns pipe stream.
*
* This embeds the cocmd.com shell interpreter which supports a limited
* subset of the bourne shell that's significantly faster:
*
* - pipelines
* - single quotes
* - double quotes
* - input redirection, e.g. `<path`
* - output redirection, e.g. `>path`, `>>append`, `2>err.txt, `2>&1`
* This embeds the Cosmopolitan Command Interpreter which provides
* Bourne-like syntax on all platforms including Windows.
*
* @see pclose()
*/
@ -54,28 +49,30 @@ FILE *popen(const char *cmdline, const char *mode) {
einval();
return NULL;
}
if (pipe(pipefds) == -1) return NULL;
fcntl(pipefds[dir], F_SETFD, FD_CLOEXEC);
if (pipe2(pipefds, O_CLOEXEC) == -1) return NULL;
if ((f = fdopen(pipefds[dir], mode))) {
switch ((pid = fork())) {
case 0:
dup2(pipefds[!dir], !dir);
_unassert(dup2(pipefds[!dir], !dir) == !dir);
// we can't rely on cloexec because cocmd builtins don't execev
if (pipefds[0] != !dir) _unassert(!close(pipefds[0]));
if (pipefds[1] != !dir) _unassert(!close(pipefds[1]));
_Exit(cocmd(3, (char *[]){"popen", "-c", cmdline, 0}));
default:
f->pid = pid;
close(pipefds[!dir]);
_unassert(!close(pipefds[!dir]));
return f;
case -1:
e = errno;
fclose(f);
close(pipefds[!dir]);
_unassert(!fclose(f));
_unassert(!close(pipefds[!dir]));
errno = e;
return NULL;
}
} else {
e = errno;
close(pipefds[0]);
close(pipefds[1]);
_unassert(!close(pipefds[0]));
_unassert(!close(pipefds[1]));
errno = e;
return NULL;
}