mirror of
https://github.com/pygos/init.git
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86 lines
1.4 KiB
C
86 lines
1.4 KiB
C
/* SPDX-License-Identifier: ISC */
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#include <sys/types.h>
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#include <dirent.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include "util.h"
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static NORETURN void usage_and_exit(void)
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{
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fputs("Usage: killall5 SIGNAL\n", stderr);
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exit(EXIT_FAILURE);
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}
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int main(int argc, char **argv)
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{
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int signo, ret = EXIT_SUCCESS;
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pid_t pid, mypid, mysid;
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struct dirent *ent;
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const char *ptr;
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DIR *dir;
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if (argc != 2)
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usage_and_exit();
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ptr = argv[1];
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if (*ptr == '-')
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++ptr;
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if (!isdigit(*ptr))
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usage_and_exit();
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for (signo = 0; isdigit(*ptr); ++ptr)
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signo = signo * 10 + ((*ptr) - '0');
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if (*ptr != '\0' || signo < 1 || signo > 31)
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usage_and_exit();
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kill(-1, SIGSTOP);
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dir = opendir("/proc");
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if (dir == NULL) {
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perror("opendir /proc");
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ret = EXIT_FAILURE;
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goto out;
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}
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mypid = getpid();
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mysid = getsid(0);
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for (;;) {
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errno = 0;
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ent = readdir(dir);
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if (ent == NULL) {
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if (errno) {
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perror("readdir");
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ret = EXIT_FAILURE;
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}
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break;
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}
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if (!isdigit(ent->d_name[0]))
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continue;
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for (pid = 0, ptr = ent->d_name; isdigit(*ptr); ++ptr)
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pid = pid * 10 + ((*ptr) - '0');
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if (*ptr != '\0' || pid == mypid || getsid(pid) == mysid)
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continue;
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if (kill(pid, signo)) {
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ret = EXIT_FAILURE;
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fprintf(stderr, "kill %d: %s\n",
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(int)pid, strerror(errno));
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}
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}
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out:
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kill(-1, SIGCONT);
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return ret;
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}
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