int
pidof_main(const struct cmd_pidof_info* info)
{
const char* name = info->name;
DIR* procdir = xopendir("/proc");
struct dirent* ent;
unsigned long found_pid = 0;
bool found = false;
while ((ent = readdir(procdir)) != NULL) {
SCOPED_RESLIST(rl);
char* endptr = NULL;
errno = 0;
unsigned long pid = strtoul(ent->d_name, &endptr, 10);
if (pid == 0 || errno != 0 || *endptr != '\0')
continue;
int cmdline_fd = try_xopen(xaprintf("/proc/%lu/cmdline", pid), O_RDONLY, 0);
if (cmdline_fd == -1)
continue;
char* name = slurp_fd(cmdline_fd, NULL);
if (strcmp(name, info->name) == 0) {
if (found)
die(EINVAL, "more than one process has name `%s'", name);
found = true;
found_pid = pid;
}
}
if (!found)
die(ENOENT, "no process has name `%s'", name);
xprintf(xstdout, "%lu%s", found_pid, info->pidof.zero ? "" : "\n");
xflush(xstdout);
return 0;
}
static char *
slurp_file(const char *path)
{
int fd;
char *ret;
fd = open(path, O_RDONLY);
if (fd < 0) {
error("Cannot open '%s': %s", path, strerror(errno));
return NULL;
}
ret = slurp_fd(fd);
if (!ret)
error("Cannot read '%s': %s", path, strerror(errno));
return ret;
}
static int
parse_dir(const char *dname, parser_fn *parse)
{
DIR *dir;
struct dirent *e;
dir = opendir(dname);
if (!dir) {
if (errno != ENOENT)
error("Cannot open '%s': %s", dname, strerror(errno));
return -1;
}
while ( (e = readdir(dir)) ) {
size_t len = strlen(e->d_name);
char *endp = e->d_name + len;
int fd;
char *args;
if (len < CONF_SUFFIX_LEN ||
strcmp(endp - CONF_SUFFIX_LEN, CONF_SUFFIX))
continue;
fd = openat(dirfd(dir), e->d_name, O_RDONLY);
if (fd < 0) {
error("Cannot open '%s': %s",
e->d_name, strerror(errno));
continue;
}
args = slurp_fd(fd);
if (!args) {
error("Cannot read '%s': %s",
e->d_name, strerror(errno));
continue;
}
parse_args(args, parse);
free(args);
}
closedir(dir);
return 0;
}
