| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the Free |
| 7 | * Software Foundation; only version 2 of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 16 | * Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <errno.h> |
| 21 | #include <limits.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <unistd.h> |
| 28 | |
| 29 | #include <lttngerr.h> |
| 30 | |
| 31 | #include "utils.h" |
| 32 | |
| 33 | /* |
| 34 | * Write to writable pipe used to notify a thread. |
| 35 | */ |
| 36 | int notify_thread_pipe(int wpipe) |
| 37 | { |
| 38 | int ret; |
| 39 | |
| 40 | ret = write(wpipe, "!", 1); |
| 41 | if (ret < 0) { |
| 42 | PERROR("write poll pipe"); |
| 43 | } |
| 44 | |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Return pointer to home directory path using the env variable HOME. |
| 50 | * |
| 51 | * No home, NULL is returned. |
| 52 | */ |
| 53 | const char *get_home_dir(void) |
| 54 | { |
| 55 | return ((const char *) getenv("HOME")); |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Create recursively directory using the FULL path. |
| 60 | */ |
| 61 | int mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 62 | { |
| 63 | int ret; |
| 64 | char *p, tmp[PATH_MAX]; |
| 65 | size_t len; |
| 66 | mode_t old_umask; |
| 67 | |
| 68 | ret = snprintf(tmp, sizeof(tmp), "%s", path); |
| 69 | if (ret < 0) { |
| 70 | PERROR("snprintf mkdir"); |
| 71 | goto error; |
| 72 | } |
| 73 | |
| 74 | len = ret; |
| 75 | if (tmp[len - 1] == '/') { |
| 76 | tmp[len - 1] = 0; |
| 77 | } |
| 78 | |
| 79 | old_umask = umask(0); |
| 80 | for (p = tmp + 1; *p; p++) { |
| 81 | if (*p == '/') { |
| 82 | *p = 0; |
| 83 | ret = mkdir(tmp, mode); |
| 84 | if (ret < 0) { |
| 85 | if (!(errno == EEXIST)) { |
| 86 | PERROR("mkdir recursive"); |
| 87 | ret = -errno; |
| 88 | goto umask_error; |
| 89 | } |
| 90 | } else if (ret == 0) { |
| 91 | /* |
| 92 | * We created the directory. Set its ownership to the |
| 93 | * user/group specified. |
| 94 | */ |
| 95 | ret = chown(tmp, uid, gid); |
| 96 | if (ret < 0) { |
| 97 | PERROR("chown in mkdir recursive"); |
| 98 | ret = -errno; |
| 99 | goto umask_error; |
| 100 | } |
| 101 | } |
| 102 | *p = '/'; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | ret = mkdir(tmp, mode); |
| 107 | if (ret < 0) { |
| 108 | if (!(errno == EEXIST)) { |
| 109 | PERROR("mkdir recursive last piece"); |
| 110 | ret = -errno; |
| 111 | } else { |
| 112 | ret = 0; |
| 113 | } |
| 114 | } else if (ret == 0) { |
| 115 | /* |
| 116 | * We created the directory. Set its ownership to the user/group |
| 117 | * specified. |
| 118 | */ |
| 119 | ret = chown(tmp, uid, gid); |
| 120 | if (ret < 0) { |
| 121 | PERROR("chown in mkdir recursive"); |
| 122 | ret = -errno; |
| 123 | goto umask_error; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | umask_error: |
| 128 | umask(old_umask); |
| 129 | error: |
| 130 | return ret; |
| 131 | } |