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/* This file is part of genrc
Copyryght (C) 2018 Sergey Poznyakoff
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
*/
#include "genrc.h"
struct file_pid_closure {
struct genrc_pid_closure generic;
char *filename;
};
pid_t
file_read_pid(char const *filename)
{
FILE *fp;
char buf[256];
int n, ec, ok;
unsigned long pid;
char *end;
fp = fopen(filename, "r");
if (!fp) {
if (errno == ENOENT)
return 0;
system_error(errno, "can't open file %s", filename);
return -1;
}
ok = fgets(buf, sizeof(buf), fp) != NULL;
ec = errno;
fclose(fp);
if (!ok) {
system_error(ec, "error reading from %s", filename);
return -1;
}
n = strlen(buf);
if (n == 0) {
genrc_error("invalid line read from %s", filename);
return -1;
}
if (buf[n-1] == '\n')
buf[n-1] = 0;
errno = 0;
pid = strtoul(buf, &end, 10);
if (errno || *end) {
genrc_error("invalid line read from %s", filename);
return -1;
}
return pid_is_running(pid) ? pid : 0;
}
static int
pid_file_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
{
struct file_pid_closure *file_clos = (struct file_pid_closure *)clos;
pid_t pid = file_read_pid(file_clos->filename);
if (pid == -1)
return -1;
if (pid > 0)
pidlist_add(plist, pid);
return 0;
}
GENRC_PID_CLOSURE *
genrc_pid_file_init(int argc, char **argv)
{
struct file_pid_closure *clos;
if (argc != 2)
usage_error("%s: expected format: FILE:<FILENAME>", argv[0]);
clos = xmalloc(sizeof(*clos));
clos->generic.pid = pid_file_get;
clos->filename = xstrdup(argv[1]);
return (GENRC_PID_CLOSURE *)clos;
}
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