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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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32
libc/runtime/daemon.c
View file

@ -16,39 +16,51 @@
│ 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/calls/syscall_support-sysv.internal.h"
#include "libc/dce.h"
#include "libc/nt/enum/processcreationflags.h"
#include "libc/paths.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/o.h"
/**
* Daemonizes process.
* Runs process in background.
*
* On Unix this calls fork() and setsid(). On Windows this is
* implemented using CreateProcess(kNtDetachedProcess).
*
* @return 0 on success, or -1 w/ errno
*/
int daemon(int nochdir, int noclose) {
int fd;
switch (fork()) {
switch (_fork(kNtDetachedProcess)) {
case -1:
return (-1);
return -1;
case 0:
break;
default:
_Exit(0);
}
if (setsid() == -1) {
return -1;
if (!IsWindows()) {
if (setsid() == -1) {
return -1;
}
}
if (!nochdir) {
chdir("/");
_unassert(!chdir("/"));
}
if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR)) != -1) {
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
_unassert(dup2(fd, 0) == 0);
_unassert(dup2(fd, 1) == 1);
_unassert(dup2(fd, 2) == 2);
if (fd > 2) {
close(fd);
_unassert(!close(fd));
}
}