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-rw-r--r--tools/perf/util/util.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
new file mode 100644
index 000000000000..f9b890fde681
--- /dev/null
+++ b/tools/perf/util/util.c
@@ -0,0 +1,94 @@
+#include "util.h"
+#include <sys/mman.h>
+
+int mkdir_p(char *path, mode_t mode)
+{
+ struct stat st;
+ int err;
+ char *d = path;
+
+ if (*d != '/')
+ return -1;
+
+ if (stat(path, &st) == 0)
+ return 0;
+
+ while (*++d == '/');
+
+ while ((d = strchr(d, '/'))) {
+ *d = '\0';
+ err = stat(path, &st) && mkdir(path, mode);
+ *d++ = '/';
+ if (err)
+ return -1;
+ while (*d == '/')
+ ++d;
+ }
+ return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
+}
+
+static int slow_copyfile(const char *from, const char *to)
+{
+ int err = 0;
+ char *line = NULL;
+ size_t n;
+ FILE *from_fp = fopen(from, "r"), *to_fp;
+
+ if (from_fp == NULL)
+ goto out;
+
+ to_fp = fopen(to, "w");
+ if (to_fp == NULL)
+ goto out_fclose_from;
+
+ while (getline(&line, &n, from_fp) > 0)
+ if (fputs(line, to_fp) == EOF)
+ goto out_fclose_to;
+ err = 0;
+out_fclose_to:
+ fclose(to_fp);
+ free(line);
+out_fclose_from:
+ fclose(from_fp);
+out:
+ return err;
+}
+
+int copyfile(const char *from, const char *to)
+{
+ int fromfd, tofd;
+ struct stat st;
+ void *addr;
+ int err = -1;
+
+ if (stat(from, &st))
+ goto out;
+
+ if (st.st_size == 0) /* /proc? do it slowly... */
+ return slow_copyfile(from, to);
+
+ fromfd = open(from, O_RDONLY);
+ if (fromfd < 0)
+ goto out;
+
+ tofd = creat(to, 0755);
+ if (tofd < 0)
+ goto out_close_from;
+
+ addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
+ if (addr == MAP_FAILED)
+ goto out_close_to;
+
+ if (write(tofd, addr, st.st_size) == st.st_size)
+ err = 0;
+
+ munmap(addr, st.st_size);
+out_close_to:
+ close(tofd);
+ if (err)
+ unlink(to);
+out_close_from:
+ close(fromfd);
+out:
+ return err;
+}