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#include "owl.h"
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#include <sys/wait.h>
/* starts up popexec in a new viewwin */
owl_popexec *owl_popexec_new(const char *command)
{
owl_popexec *pe;
owl_popwin *pw;
owl_viewwin *v;
int pipefds[2], child_write_fd, parent_read_fd;
pid_t pid;
GIOChannel *channel;
if (owl_global_get_popwin(&g) || owl_global_get_viewwin(&g)) {
owl_function_error("Popwin already in use.");
return NULL;
}
pe = g_slice_new(owl_popexec);
pe->winactive=0;
pe->pid=0;
pe->refcount=0;
pw = owl_popwin_new();
owl_global_set_popwin(&g, pw);
owl_popwin_up(pw);
pe->vwin = v = owl_viewwin_new_text(owl_popwin_get_content(pw), "");
owl_global_set_viewwin(&g, v);
owl_viewwin_set_onclose_hook(v, owl_popexec_viewwin_onclose, pe);
owl_global_push_context(&g, OWL_CTX_POPLESS, v, "popless", NULL);
pe->refcount++;
if (0 != pipe(pipefds)) {
owl_function_error("owl_function_popless_exec: pipe failed\n");
return NULL;
}
parent_read_fd = pipefds[0];
child_write_fd = pipefds[1];
pid = fork();
if (pid == -1) {
close(pipefds[0]);
close(pipefds[1]);
owl_function_error("owl_function_popless_exec: fork failed\n");
return NULL;
} else if (pid != 0) {
close(child_write_fd);
/* still in owl */
pe->pid=pid;
pe->winactive=1;
channel = g_io_channel_unix_new(parent_read_fd);
g_io_channel_set_close_on_unref(channel, TRUE);
pe->io_watch = g_io_add_watch_full(channel, G_PRIORITY_DEFAULT,
G_IO_IN | G_IO_ERR | G_IO_HUP,
owl_popexec_inputhandler, pe,
(GDestroyNotify)owl_popexec_unref);
g_io_channel_unref(channel);
pe->refcount++;
} else {
/* in the child process */
int i;
int fdlimit = sysconf(_SC_OPEN_MAX);
for (i=0; i<fdlimit; i++) {
if (i!=child_write_fd) close(i);
}
dup2(child_write_fd, 1 /*stdout*/);
dup2(child_write_fd, 2 /*stderr*/);
close(child_write_fd);
execl("/bin/sh", "sh", "-c", command, (const char *)NULL);
_exit(127);
}
return pe;
}
gboolean owl_popexec_inputhandler(GIOChannel *source, GIOCondition condition, void *data)
{
owl_popexec *pe = data;
int navail, bread, rv_navail;
char *buf;
int status;
int fd = g_io_channel_unix_get_fd(source);
/* TODO: Reading from GIOChannel may be more convenient. */
if (!pe) return FALSE;
/* If pe->winactive is 0 then the vwin has closed.
* If pe->pid is 0 then the child has already been reaped.
* if d->fd is -1 then the fd has been closed out.
* Under these cases we want to get to a state where:
* - data read until end if child running
* - child reaped
* - fd closed
* - callback removed
*/
/* the viewwin has closed */
if (!pe->pid && !pe->winactive) {
pe->io_watch = 0;
return FALSE;
}
if (0 != (rv_navail = ioctl(fd, FIONREAD, &navail))) {
owl_function_debugmsg("ioctl error");
}
/* check to see if the child has ended gracefully and no more data is
* ready to be read... */
if (navail==0 && pe->pid>0 && waitpid(pe->pid, &status, WNOHANG) > 0) {
owl_function_debugmsg("waitpid got child status: <%d>\n", status);
pe->pid = 0;
if (pe->winactive) {
owl_viewwin_append_text(pe->vwin, "\n");
}
pe->io_watch = 0;
return FALSE;
}
if (fd<0 || !pe->pid || !pe->winactive || rv_navail) {
owl_function_error("popexec should not have reached this point");
return FALSE;
}
if (navail<=0) return TRUE;
if (navail>1024) { navail = 1024; }
buf = g_new(char, navail+1);
owl_function_debugmsg("about to read %d", navail);
bread = read(fd, buf, navail);
if (bread<0) {
perror("read");
owl_function_debugmsg("read error");
}
if (buf[navail-1] != '\0') {
buf[navail] = '\0';
}
owl_function_debugmsg("got data: <%s>", buf);
if (pe->winactive) {
owl_viewwin_append_text(pe->vwin, buf);
}
g_free(buf);
return TRUE;
}
void owl_popexec_viewwin_onclose(owl_viewwin *vwin, void *data)
{
owl_popexec *pe = data;
int status, rv;
pe->winactive = 0;
if (pe->io_watch) {
g_source_remove(pe->io_watch);
pe->io_watch = 0;
}
if (pe->pid) {
/* TODO: we should handle the case where SIGTERM isn't good enough */
rv = kill(pe->pid, SIGTERM);
owl_function_debugmsg("kill of pid %d returned %d", pe->pid, rv);
rv = waitpid(pe->pid, &status, 0);
owl_function_debugmsg("waidpid returned %d, status %d", rv, status);
pe->pid = 0;
}
owl_function_debugmsg("unref of %p from onclose", pe);
owl_popexec_unref(pe);
}
void owl_popexec_unref(owl_popexec *pe)
{
owl_function_debugmsg("unref of %p was %d", pe, pe->refcount);
pe->refcount--;
if (pe->refcount<=0) {
owl_function_debugmsg("doing free of %p", pe);
g_slice_free(owl_popexec, pe);
}
}
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