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63 lines
1.4 KiB
63 lines
1.4 KiB
/*
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* Copyright (c) 2015 Cedric Hnyda <chnyda@suse.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Description:
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* Write the current process in argv[1]
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* and returns:
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* -> 2 if fork fails with EAGAIN,
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* -> 1 if there is another problem
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* -> 0 if everything worked
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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int main(int argc, char **argv)
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{
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FILE *f;
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int newpid;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s /cgroup/.../tasks\n", argv[0]);
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return 1;
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}
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f = fopen(argv[1], "a");
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if (!f) {
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perror("fopen failed");
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return 1;
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}
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fprintf(f, "%i\n", getpid());
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fclose(f);
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newpid = fork();
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if (newpid == -1 && errno == EAGAIN)
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return 2;
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if (newpid == -1) {
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perror("fork() failed");
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return 1;
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}
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if (newpid == 0)
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pause();
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return 0;
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}
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