linux/tools/perf/util/path.c
Ian Rogers 370ce164de perf path: Make mkpath thread safe, remove 16384 bytes from .bss
Avoid 4 static arrays for paths, pass in a char[] buffer to use. Makes
mkpath thread safe for the small number of users. Also removes 16,384
bytes from .bss.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Ross Zwisler <zwisler@chromium.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20230526183401.2326121-13-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2023-05-28 10:24:14 -03:00

82 lines
1.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include "path.h"
#include "cache.h"
#include <linux/kernel.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
static char *cleanup_path(char *path)
{
/* Clean it up */
if (!memcmp(path, "./", 2)) {
path += 2;
while (*path == '/')
path++;
}
return path;
}
char *mkpath(char *path_buf, size_t sz, const char *fmt, ...)
{
va_list args;
unsigned len;
va_start(args, fmt);
len = vsnprintf(path_buf, sz, fmt, args);
va_end(args);
if (len >= sz)
strncpy(path_buf, "/bad-path/", sz);
return cleanup_path(path_buf);
}
int path__join(char *bf, size_t size, const char *path1, const char *path2)
{
return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
}
int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
{
return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
path2, path2[0] ? "/" : "", path3);
}
bool is_regular_file(const char *file)
{
struct stat st;
if (stat(file, &st))
return false;
return S_ISREG(st.st_mode);
}
/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
bool is_directory(const char *base_path, const struct dirent *dent)
{
char path[PATH_MAX];
struct stat st;
snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return false;
return S_ISDIR(st.st_mode);
}
bool is_executable_file(const char *base_path, const struct dirent *dent)
{
char path[PATH_MAX];
struct stat st;
snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return false;
return !S_ISDIR(st.st_mode) && (st.st_mode & S_IXUSR);
}