490 lines
13 KiB
C
490 lines
13 KiB
C
#include "kill.h"
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static pid_t opt_ns_pid = 0;
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static int exact = 1, reg = 0, wait_until_dead = 1, process_group =
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0, ignore_case = 0;
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static long younger_than = 0, older_than = 0;
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typedef struct NAMEINFO {
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const char *name;
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int name_length;
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struct stat st;
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} NAMEINFO;
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static double uptime()
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{
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char *savelocale;
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char buf[2048];
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FILE *file;
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if (!(file = fopen(PROC_BASE "/uptime", "r"))) {
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exit(1);
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}
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savelocale = setlocale(LC_NUMERIC, "C");
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if (fscanf(file, "%2047s", buf) == EOF)
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perror("uptime");
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fclose(file);
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setlocale(LC_NUMERIC, savelocale);
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return atof(buf);
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}
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static double process_age(const unsigned long long jf)
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{
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double age;
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double sc_clk_tck = sysconf(_SC_CLK_TCK);
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assert(sc_clk_tck > 0);
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age = uptime() - jf / sc_clk_tck;
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if (age < 0L)
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return 0L;
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return age;
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}
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enum ns_type {
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IPCNS = 0,
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MNTNS,
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NETNS,
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PIDNS,
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USERNS,
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UTSNS
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};
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static const char *ns_names[] = {
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[IPCNS] = "ipc",
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[MNTNS] = "mnt",
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[NETNS] = "net",
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[PIDNS] = "pid",
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[USERNS] = "user",
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[UTSNS] = "uts",
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};
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const char *get_ns_name(int id)
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{
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if (id >= 6)
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return NULL;
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return ns_names[id];
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}
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static int get_ns(pid_t pid, int id)
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{
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struct stat st;
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char buff[50];
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snprintf(buff, sizeof(buff), "/proc/%i/ns/%s", pid, get_ns_name(id));
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if (stat(buff, &st))
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return 0;
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else
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return st.st_ino;
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}
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static int match_process_uid(pid_t pid, uid_t uid)
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{
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char buf[128];
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uid_t puid;
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FILE *f;
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int re = -1;
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snprintf(buf, sizeof buf, PROC_BASE "/%d/status", pid);
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if (!(f = fopen(buf, "r")))
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return 0;
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while (fgets(buf, sizeof buf, f)) {
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if (sscanf(buf, "Uid:\t%d", &puid)) {
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re = uid == puid;
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break;
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}
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}
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fclose(f);
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if (re == -1) {
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exit(1);
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}
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return re;
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}
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static void free_regexp_list(regex_t * reglist, int names)
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{
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int i;
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for (i = 0; i < names; i++)
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regfree(®list[i]);
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free(reglist);
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}
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static regex_t *build_regexp_list(int names, char **namelist)
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{
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int i;
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regex_t *reglist;
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int flag = REG_EXTENDED | REG_NOSUB;
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if (!(reglist = malloc(sizeof(regex_t) * names))) {
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perror("malloc");
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exit(1);
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}
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if (ignore_case)
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flag |= REG_ICASE;
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for (i = 0; i < names; i++) {
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if (regcomp(®list[i], namelist[i], flag) != 0) {
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free_regexp_list(reglist, i);
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exit(1);
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}
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}
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return reglist;
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}
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static NAMEINFO *build_nameinfo(const int names, char **namelist)
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{
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int i;
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NAMEINFO *ni = NULL;
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if ((ni = malloc(sizeof(NAMEINFO) * names)) == NULL)
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return NULL;
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for (i = 0; i < names; i++) {
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ni[i].name = namelist[i];
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ni[i].st.st_dev = 0;
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if (!strchr(namelist[i], '/')) {
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ni[i].name_length = strlen(namelist[i]);
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} else if (stat(namelist[i], &(ni[i].st)) < 0) {
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perror(namelist[i]);
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free(ni);
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return NULL;
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}
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}
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return ni;
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}
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static int
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load_process_name_and_age(char *comm, double *process_age_sec,
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const pid_t pid, int load_age)
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{
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FILE *file;
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char *path;
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char buf[1024];
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char *startcomm, *endcomm;
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unsigned lencomm;
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*process_age_sec = 0;
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if (asprintf(&path, PROC_BASE "/%d/stat", pid) < 0)
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return -1;
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if (!(file = fopen(path, "r"))) {
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free(path);
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return -1;
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}
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free(path);
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if (fgets(buf, 1024, file) == NULL) {
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fclose(file);
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return -1;
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}
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fclose(file);
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startcomm = strchr(buf, '(') + 1;
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endcomm = strrchr(startcomm, ')');
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lencomm = endcomm - startcomm;
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if (lencomm < 0)
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lencomm = 0;
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if (lencomm > COMM_LEN - 1)
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lencomm = COMM_LEN - 1;
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strncpy(comm, startcomm, lencomm);
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comm[lencomm] = '\0';
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endcomm += 2; // skip ") "
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if (load_age) {
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unsigned long long proc_stt_jf = 0;
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if (sscanf
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(endcomm,
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"%*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %Lu",
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&proc_stt_jf) != 1) {
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return -1;
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}
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*process_age_sec = process_age(proc_stt_jf);
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}
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return lencomm;
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}
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static int
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load_proc_cmdline(const pid_t pid, const char *comm, char **command,
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int *got_long)
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{
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FILE *file;
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char *path, *p, *command_buf;
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int cmd_size = 128;
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int okay;
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if (asprintf(&path, PROC_BASE "/%d/cmdline", pid) < 0)
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return -1;
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if (!(file = fopen(path, "r"))) {
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free(path);
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return -1;
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}
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free(path);
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if ((command_buf = (char *)malloc(cmd_size)) == NULL)
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exit(1);
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while (1) {
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for (p = command_buf;; p++) {
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int c;
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if (p == (command_buf + cmd_size)) {
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char *new_command_buf;
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int cur_size = cmd_size;
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cmd_size *= 2;
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new_command_buf = (char *)realloc(command_buf, cmd_size);
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if (!new_command_buf) {
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if (command_buf)
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free(command_buf);
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exit(1);
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}
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command_buf = new_command_buf;
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p = command_buf + cur_size;
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}
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c = fgetc(file);
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if (c == EOF || c == '\0') {
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*p = '\0';
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break;
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} else {
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*p = c;
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}
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}
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if (strlen(command_buf) == 0) {
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okay = 0;
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break;
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}
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p = strrchr(command_buf, '/');
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p = p ? p + 1 : command_buf;
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if (strncmp(p, comm, COMM_LEN - 1) == 0) {
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okay = 1;
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if (!(*command = strdup(p))) {
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free(command_buf);
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exit(1);
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}
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break;
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}
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}
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(void)fclose(file);
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free(command_buf);
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command_buf = NULL;
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if (exact && !okay) {
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*got_long = okay;
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return -1;
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}
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*got_long = okay;
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return 0;
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}
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static pid_t *create_pid_table(int *max_pids, int *pids)
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{
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pid_t self, *pid_table;
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int pid;
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DIR *dir;
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struct dirent *de;
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self = getpid();
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if (!(dir = opendir(PROC_BASE))) {
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perror(PROC_BASE);
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exit(1);
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}
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*max_pids = 256;
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pid_table = malloc(*max_pids * sizeof(pid_t));
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if (!pid_table) {
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perror("malloc");
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exit(1);
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}
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*pids = 0;
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while ((de = readdir(dir)) != NULL) {
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if (!(pid = (pid_t) atoi(de->d_name)) || pid == self)
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continue;
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if (*pids == *max_pids) {
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if (!(pid_table = realloc(pid_table, 2 * *pids * sizeof(pid_t)))) {
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perror("realloc");
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exit(1);
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}
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*max_pids *= 2;
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}
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pid_table[(*pids)++] = pid;
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}
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(void)closedir(dir);
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return pid_table;
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}
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#define strcmp2(A,B,I) (I? strcasecmp((A),(B)):strcmp((A),(B)))
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#define strncmp2(A,B,L,I) (I? strncasecmp((A),(B),(L)):strncmp((A),(B),(L)))
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static int match_process_name(const char *proc_comm,
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const int comm_len,
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const char *proc_cmdline,
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const char *match_name,
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const int match_len, const int got_long)
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{
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if (comm_len == OLD_COMM_LEN - 1 && match_len >= OLD_COMM_LEN - 1) {
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if (got_long) {
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return (0 == strncmp2(match_name, proc_cmdline, OLD_COMM_LEN - 1,
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ignore_case));
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} else {
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return (0 == strncmp2(match_name, proc_comm, OLD_COMM_LEN - 1,
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ignore_case));
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}
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}
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if (comm_len == COMM_LEN - 1 && match_len >= COMM_LEN - 1) {
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if (got_long) {
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return (0 == strncmp2(match_name, proc_cmdline, COMM_LEN - 1,
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ignore_case));
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} else {
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return (0 == strncmp2(match_name, proc_comm, COMM_LEN - 1,
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ignore_case));
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}
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}
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if (got_long) {
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return (0 == strcmp2(match_name, proc_cmdline, ignore_case));
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}
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return (0 == strcmp2(match_name, proc_comm, ignore_case));
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}
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int kill_all(int signal, int name_count, char **namelist, struct passwd *pwent)
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{
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struct stat st;
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NAMEINFO *name_info = NULL;
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char *path, comm[COMM_LEN];
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char *command = NULL;
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pid_t *pid_table, *pid_killed;
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pid_t *pgids = NULL;
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int i, j, length, got_long, error;
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int pids, max_pids, pids_killed;
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unsigned long found;
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regex_t *reglist = NULL;
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long ns_ino = 0;
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if (opt_ns_pid)
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ns_ino = get_ns(opt_ns_pid, PIDNS);
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if (name_count && reg)
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reglist = build_regexp_list(name_count, namelist);
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else if ((name_info = build_nameinfo(name_count, namelist)) == NULL)
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exit(1);
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pid_table = create_pid_table(&max_pids, &pids);
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found = 0;
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pids_killed = 0;
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pid_killed = malloc(max_pids * sizeof(pid_t));
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if (!pid_killed) {
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perror("malloc");
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exit(1);
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}
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if (process_group) {
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pgids = calloc(pids, sizeof(pid_t));
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if (!pgids) {
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perror("malloc");
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exit(1);
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}
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}
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got_long = 0;
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for (i = 0; i < pids; i++) {
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pid_t id;
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int found_name = -1;
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double process_age_sec = 0;
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if (pwent && match_process_uid(pid_table[i], pwent->pw_uid) == 0)
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continue;
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if (opt_ns_pid && ns_ino && ns_ino != get_ns(pid_table[i], PIDNS))
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continue;
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length =
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load_process_name_and_age(comm, &process_age_sec, pid_table[i],
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(younger_than || older_than));
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if (length < 0)
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continue;
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if (younger_than && (process_age_sec > younger_than))
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continue;
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if (older_than && (process_age_sec < older_than))
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continue;
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got_long = 0;
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if (command) {
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free(command);
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command = NULL;
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}
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if (length == COMM_LEN - 1)
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if (load_proc_cmdline(pid_table[i], comm, &command, &got_long) < 0)
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continue;
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for (j = 0; j < name_count; j++) {
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if (reg) {
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if (regexec(®list[j], got_long ? command : comm, 0, NULL, 0)
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!= 0)
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continue;
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} else {
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if (!name_info[j].st.st_dev) {
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if (!match_process_name(comm, length, command, namelist[j],
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name_info[j].name_length, got_long))
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continue;
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} else {
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int ok = 1;
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if (asprintf(&path, PROC_BASE "/%d/exe", pid_table[i]) < 0)
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continue;
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if (stat(path, &st) < 0)
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ok = 0;
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else if (name_info[j].st.st_dev != st.st_dev ||
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name_info[j].st.st_ino != st.st_ino) {
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size_t len = strlen(namelist[j]);
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char *linkbuf = malloc(len + 1);
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if (!linkbuf ||
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readlink(path, linkbuf, len + 1) != (ssize_t) len ||
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memcmp(namelist[j], linkbuf, len))
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ok = 0;
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free(linkbuf);
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}
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free(path);
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if (!ok)
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continue;
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}
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}
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found_name = j;
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break;
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}
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if (name_count && found_name == -1)
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continue;
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if (!process_group)
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id = pid_table[i];
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else {
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int j;
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id = getpgid(pid_table[i]);
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pgids[i] = id;
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for (j = 0; j < i; j++)
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if (pgids[j] == id)
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break;
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if (j < i)
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continue;
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}
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if (kill(process_group ? -id : id, signal) >= 0) {
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if (found_name >= 0)
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found |= 1UL << found_name;
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pid_killed[pids_killed++] = id;
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}
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}
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if (command)
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free(command);
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if (reglist)
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free_regexp_list(reglist, name_count);
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free(pgids);
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if (name_count)
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error =
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found ==
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((1UL << (name_count - 1)) | ((1UL << (name_count - 1)) - 1)) ? 0 :
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1;
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else
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error = pids_killed ? 0 : 1;
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while (pids_killed && wait_until_dead) {
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for (i = 0; i < pids_killed;) {
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if (kill(process_group ? -pid_killed[i] : pid_killed[i], 0) < 0 &&
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errno == ESRCH) {
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pid_killed[i] = pid_killed[--pids_killed];
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continue;
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}
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i++;
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}
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//sleep(1);
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}
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free(pid_killed);
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free(pid_table);
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free(name_info);
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return error;
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}
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