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/*
* ion/mod_statusbar/statusd-launch.c
*
* Copyright (c) Tuomo Valkonen 1999-2009.
*
* See the included file LICENSE for details.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <libtu/minmax.h>
#include <libextl/readconfig.h>
#include <libmainloop/exec.h>
#include <libmainloop/select.h>
#include <libmainloop/signal.h>
#include <ioncore/saveload.h>
#include <ioncore/bindmaps.h>
#include <ioncore/global.h>
#include <ioncore/ioncore.h>
#include "statusbar.h"
#define CF_STATUSD_TIMEOUT_SEC 3
#define BL 1024
#define USEC 1000000
static bool process_pipe(int fd, ExtlFn fn,
bool *doneseen, bool *eagain)
{
char buf[BL];
int n;
bool fnret;
*eagain=FALSE;
n=read(fd, buf, BL-1);
if(n<0){
if(errno==EAGAIN || errno==EINTR){
*eagain=(errno==EAGAIN);
return TRUE;
}
warn_err_obj(TR("reading a pipe"));
return FALSE;
}else if(n>0){
buf[n]='\0';
*doneseen=FALSE;
return extl_call(fn, "s", "b", &buf, doneseen);
}
return FALSE;
}
static bool wait_statusd_init(int outfd, int errfd, ExtlFn dh, ExtlFn eh)
{
fd_set rfds;
struct timeval tv, endtime, now;
int nfds=maxof(outfd, errfd);
int retval;
bool dummy, doneseen, eagain=FALSE;
if(mainloop_gettime(&endtime)!=0){
warn_err();
return FALSE;
}
now=endtime;
endtime.tv_sec+=CF_STATUSD_TIMEOUT_SEC;
while(1){
FD_ZERO(&rfds);
/* Calculate remaining time */
if(now.tv_sec>endtime.tv_sec){
goto timeout;
}else if(now.tv_sec==endtime.tv_sec){
if(now.tv_usec>=endtime.tv_usec)
goto timeout;
tv.tv_sec=0;
tv.tv_usec=endtime.tv_usec-now.tv_usec;
}else{
tv.tv_usec=USEC+endtime.tv_usec-now.tv_usec;
tv.tv_sec=-1+endtime.tv_sec-now.tv_sec;
/* Kernel lameness tuner: */
tv.tv_sec+=tv.tv_usec/USEC;
tv.tv_usec%=USEC;
}
FD_SET(outfd, &rfds);
FD_SET(errfd, &rfds);
retval=select(nfds+1, &rfds, NULL, NULL, &tv);
if(retval>0){
if(FD_ISSET(errfd, &rfds)){
if(!process_pipe(errfd, eh, &dummy, &eagain))
return FALSE;
}
if(FD_ISSET(outfd, &rfds)){
if(!process_pipe(outfd, dh, &doneseen, &eagain))
return FALSE;
if(doneseen){
/* Read rest of errors. */
bool ok;
do{
ok=process_pipe(errfd, eh, &dummy, &eagain);
}while(ok && !eagain);
return TRUE;
}
}
}else if(retval==0){
goto timeout;
}
if(mainloop_gettime(&now)!=0){
warn_err();
return FALSE;
}
}
return TRUE;
timeout:
/* Just complain to stderr, not startup error log, and do not fail.
* The system might just be a bit slow. We can continue, but without
* initial values for the meters, geometry adjustments may be necessary
* when we finally get that information.
*/
ioncore_warn_nolog(TR("ion-statusd timed out."));
return TRUE;
}
EXTL_EXPORT
int mod_statusbar__launch_statusd(const char *cmd,
ExtlFn initdatahandler,
ExtlFn initerrhandler,
ExtlFn datahandler,
ExtlFn errhandler)
{
pid_t pid;
int outfd=-1, errfd=-1;
if(cmd==NULL)
return -1;
pid=mainloop_do_spawn(cmd, NULL, NULL,
NULL, &outfd, &errfd);
if(pid<0)
return -1;
if(!wait_statusd_init(outfd, errfd, initdatahandler, initerrhandler))
goto err;
if(!mainloop_register_input_fd_extlfn(outfd, datahandler))
goto err;
if(!mainloop_register_input_fd_extlfn(errfd, errhandler))
goto err2;
return pid;
err2:
mainloop_unregister_input_fd(outfd);
err:
close(outfd);
close(errfd);
return -1;
}
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