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Use fork/exec instead of popen to run lsof (#757) 

Fixes #675
This commit is contained in:
wangqr 2018-03-16 22:39:03 +08:00 committed by Hisham Muhammad
parent f48f5a10ca
commit 6c2b3b546d
1 changed files with 33 additions and 6 deletions
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39
OpenFilesScreen.c
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@ -76,16 +76,35 @@ void OpenFilesScreen_draw(InfoScreen* this) {
}
static OpenFiles_ProcessData* OpenFilesScreen_getProcessData(pid_t pid) {
char command[1025];
xSnprintf(command, 1024, "lsof -P -p %d -F 2> /dev/null", pid);
FILE* fd = popen(command, "r");
char buffer[1025];
xSnprintf(buffer, 1024, "%d", pid);
OpenFiles_ProcessData* pdata = xCalloc(1, sizeof(OpenFiles_ProcessData));
OpenFiles_FileData* fdata = NULL;
OpenFiles_Data* item = &(pdata->data);
if (!fd) {
pdata->error = 127;
int fdpair[2];
if (pipe(fdpair) == -1) {
pdata->error = 1;
return pdata;
}
pid_t child = fork();
if (child == -1) {
pdata->error = 1;
return pdata;
}
if (child == 0) {
close(fdpair[0]);
dup2(fdpair[1], STDOUT_FILENO);
close(fdpair[1]);
int fdnull = open("/dev/null", O_WRONLY);
if (fdnull < 0)
exit(1);
dup2(fdnull, STDERR_FILENO);
close(fdnull);
execlp("lsof", "lsof", "-P", "-p", buffer, "-F", NULL);
exit(127);
}
close(fdpair[1]);
FILE* fd = fdopen(fdpair[0], "r");
for (;;) {
char* line = String_readLine(fd);
if (!line) {
@ -105,7 +124,15 @@ static OpenFiles_ProcessData* OpenFilesScreen_getProcessData(pid_t pid) {
item->data[cmd] = xStrdup(line + 1);
free(line);
}
pdata->error = pclose(fd);
int wstatus;
if (waitpid(child, &wstatus, 0) == -1) {
pdata->error = 1;
return pdata;
}
if (!WIFEXITED(wstatus))
pdata->error = 1;
else
pdata->error = WEXITSTATUS(wstatus);
return pdata;
}