Add mkdir_recursive function to libcommon utils

[lttng-tools.git] / src / common / utils.c

diff --git a/src/common/utils.c b/src/common/utils.c
index 781888eb351d1ff720b13826706c3cd41812a51c..d8cb4a60f1574a936fab23bcf3a9535b2875a136 100644 (file)
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -16,11 +16,15 @@
  */
 
 #define _GNU_SOURCE
+#include <assert.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 
 #include <common/common.h>
 
@@ -179,3 +183,121 @@ char *utils_strdupdelim(const char *begin, const char *end)
 error:
        return str;
 }
+
+/*
+ * Set CLOEXEC flag to the give file descriptor.
+ */
+__attribute__((visibility("hidden")))
+int utils_set_fd_cloexec(int fd)
+{
+       int ret;
+
+       if (fd < 0) {
+               ret = -EINVAL;
+               goto end;
+       }
+
+       ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
+       if (ret < 0) {
+               PERROR("fcntl cloexec");
+               ret = -errno;
+       }
+
+end:
+       return ret;
+}
+
+/*
+ * Create pid file to the given path and filename.
+ */
+__attribute__((visibility("hidden")))
+int utils_create_pid_file(pid_t pid, const char *filepath)
+{
+       int ret;
+       FILE *fp;
+
+       assert(filepath);
+
+       fp = fopen(filepath, "w");
+       if (fp == NULL) {
+               PERROR("open pid file %s", filepath);
+               ret = -1;
+               goto error;
+       }
+
+       ret = fprintf(fp, "%d\n", pid);
+       if (ret < 0) {
+               PERROR("fprintf pid file");
+       }
+
+       fclose(fp);
+       DBG("Pid %d written in file %s", pid, filepath);
+error:
+       return ret;
+}
+
+/*
+ * Recursively create directory using the given path and mode.
+ *
+ * On success, return 0 else a negative error code.
+ */
+__attribute__((visibility("hidden")))
+int utils_mkdir_recursive(const char *path, mode_t mode)
+{
+       char *p, tmp[PATH_MAX];
+       struct stat statbuf;
+       size_t len;
+       int ret;
+
+       assert(path);
+
+       ret = snprintf(tmp, sizeof(tmp), "%s", path);
+       if (ret < 0) {
+               PERROR("snprintf mkdir");
+               goto error;
+       }
+
+       len = ret;
+       if (tmp[len - 1] == '/') {
+               tmp[len - 1] = 0;
+       }
+
+       for (p = tmp + 1; *p; p++) {
+               if (*p == '/') {
+                       *p = 0;
+                       if (tmp[strlen(tmp) - 1] == '.' &&
+                                       tmp[strlen(tmp) - 2] == '.' &&
+                                       tmp[strlen(tmp) - 3] == '/') {
+                               ERR("Using '/../' is not permitted in the trace path (%s)",
+                                               tmp);
+                               ret = -1;
+                               goto error;
+                       }
+                       ret = stat(tmp, &statbuf);
+                       if (ret < 0) {
+                               ret = mkdir(tmp, mode);
+                               if (ret < 0) {
+                                       if (errno != EEXIST) {
+                                               PERROR("mkdir recursive");
+                                               ret = -errno;
+                                               goto error;
+                                       }
+                               }
+                       }
+                       *p = '/';
+               }
+       }
+
+       ret = mkdir(tmp, mode);
+       if (ret < 0) {
+               if (errno != EEXIST) {
+                       PERROR("mkdir recursive last piece");
+                       ret = -errno;
+               } else {
+                       ret = 0;
+               }
+       }
+
+error:
+       return ret;
+}