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/**
* orphan-reaper — Place subreapers in your process tree to keep it structured
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/prctl.h>
static void usage(void)
{
printf("USAGE: orphan-reaper [--fatal] [--] <command...>\n");
printf("\n");
printf("Unless `--fatal` is used, the program will run <command>\n");
printf("even if the process could not be marked as a child subreaper.\n");
printf("\n");
}
int main(int argc, char** argv)
{
int i, j, fatal = 0;
char** exec_argv;
pid_t pid;
if ((argc < 2) || !strcmp(argv[1], "--help"))
return usage(), argc < 2 ? 1 : 0;
for (i = 1; i < argc; i++)
if (!strcmp(argv[i], "--fatal"))
fatal = 1;
else if (!strcmp(argv[i], "--"))
{
i++;
break;
}
else if (strstr(argv[i], "-") == argv[i])
return usage(), 1;
else
break;
if (i == argc)
return usage(), 1;
exec_argv = malloc((argc - i + 1) * sizeof(char*));
if (exec_argv == NULL)
return perror(*argv), 2;
exec_argv[argc - i] = NULL;
for (j = 0; i < argc; j++, i++)
exec_argv[j] = argv[i];
if (access(LIBEXECDIR "/reapd", X_OK) < 0)
goto pfail;
if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0)
goto error;
pid = fork();
if (pid == -1)
goto error;
else if (pid == 0)
goto exec;
else
{
exec_argv[0] = LIBEXECDIR "/reapd";
exec_argv[1] = NULL;
execvp(*exec_argv, exec_argv);
goto pfail;
}
exec:
(void) prctl(PR_SET_CHILD_SUBREAPER, 0);
execvp(*exec_argv, exec_argv);
pfail:
perror(*argv);
fail:
free(exec_argv);
return 2;
error:
perror(*argv);
if (fatal)
goto fail;
goto exec;
}
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