src/common/fd-tracker/utils.c

   1 /*
   2  * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #include <unistd.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <common/fd-tracker/utils.h>
  22 #include <common/utils.h>
  23
  24 static
  25 int open_pipe_cloexec(void *data, int *fds)
  26 {
  27         int ret;
  28
  29         ret = utils_create_pipe_cloexec(fds);
  30         if (ret < 0) {
  31                 goto end;
  32         }
  33 end:
  34         return ret;
  35 }
  36
  37 static
  38 int close_pipe(void *data, int *pipe)
  39 {
  40         utils_close_pipe(pipe);
  41         pipe[0] = pipe[1] = -1;
  42         return 0;
  43 }
  44
  45 int fd_tracker_util_close_fd(void *unused, int *fd)
  46 {
  47         return close(*fd);
  48 }
  49
  50 int fd_tracker_util_pipe_open_cloexec(struct fd_tracker *tracker,
  51                 const char *name, int *pipe)
  52 {
  53         int ret;
  54         const char *name_prefix;
  55         char *names[2];
  56
  57         name_prefix = name ? name : "Unknown pipe";
  58         ret = asprintf(&names[0], "%s (read end)", name_prefix);
  59         if (ret < 0) {
  60                 goto end;
  61         }
  62         ret = asprintf(&names[1], "%s (write end)", name_prefix);
  63         if (ret < 0) {
  64                 goto end;
  65         }
  66
  67         ret = fd_tracker_open_unsuspendable_fd(tracker, pipe,
  68                         (const char **) names, 2, open_pipe_cloexec, NULL);
  69         free(names[0]);
  70         free(names[1]);
  71 end:
  72         return ret;
  73 }
  74
  75 int fd_tracker_util_pipe_close(struct fd_tracker *tracker, int *pipe)
  76 {
  77         return fd_tracker_close_unsuspendable_fd(tracker,
  78                         pipe, 2, close_pipe, NULL);
  79 }