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-rw-r--r--tools/lib/api/Makefile6
-rw-r--r--tools/lib/api/fs/fs.c86
-rw-r--r--tools/lib/api/fs/tracing_path.c2
-rw-r--r--tools/lib/api/io.h83
-rw-r--r--tools/lib/api/io_dir.h105
5 files changed, 188 insertions, 94 deletions
diff --git a/tools/lib/api/Makefile b/tools/lib/api/Makefile
index 044860ac1ed1..8665c799e0fa 100644
--- a/tools/lib/api/Makefile
+++ b/tools/lib/api/Makefile
@@ -31,11 +31,7 @@ CFLAGS := $(EXTRA_WARNINGS) $(EXTRA_CFLAGS)
CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -U_FORTIFY_SOURCE -fPIC
ifeq ($(DEBUG),0)
-ifeq ($(CC_NO_CLANG), 0)
CFLAGS += -O3
-else
- CFLAGS += -O6
-endif
endif
ifeq ($(DEBUG),0)
@@ -99,7 +95,7 @@ install_lib: $(LIBFILE)
$(call do_install_mkdir,$(libdir_SQ)); \
cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
-HDRS := cpu.h debug.h io.h
+HDRS := cpu.h debug.h io.h io_dir.h
FD_HDRS := fd/array.h
FS_HDRS := fs/fs.h fs/tracing_path.h
INSTALL_HDRS_PFX := $(DESTDIR)$(prefix)/include/api
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 5cb0eeec2c8a..edec23406dbc 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -16,6 +16,7 @@
#include <sys/mount.h>
#include "fs.h"
+#include "../io.h"
#include "debug-internal.h"
#define _STR(x) #x
@@ -295,7 +296,7 @@ int filename__read_int(const char *filename, int *value)
int fd = open(filename, O_RDONLY), err = -1;
if (fd < 0)
- return -1;
+ return -errno;
if (read(fd, line, sizeof(line)) > 0) {
*value = atoi(line);
@@ -313,7 +314,7 @@ static int filename__read_ull_base(const char *filename,
int fd = open(filename, O_RDONLY), err = -1;
if (fd < 0)
- return -1;
+ return -errno;
if (read(fd, line, sizeof(line)) > 0) {
*value = strtoull(line, NULL, base);
@@ -344,53 +345,24 @@ int filename__read_ull(const char *filename, unsigned long long *value)
return filename__read_ull_base(filename, value, 0);
}
-#define STRERR_BUFSIZE 128 /* For the buffer size of strerror_r */
-
int filename__read_str(const char *filename, char **buf, size_t *sizep)
{
- size_t size = 0, alloc_size = 0;
- void *bf = NULL, *nbf;
- int fd, n, err = 0;
- char sbuf[STRERR_BUFSIZE];
+ struct io io;
+ char bf[128];
+ int err;
- fd = open(filename, O_RDONLY);
- if (fd < 0)
+ io.fd = open(filename, O_RDONLY);
+ if (io.fd < 0)
return -errno;
-
- do {
- if (size == alloc_size) {
- alloc_size += BUFSIZ;
- nbf = realloc(bf, alloc_size);
- if (!nbf) {
- err = -ENOMEM;
- break;
- }
-
- bf = nbf;
- }
-
- n = read(fd, bf + size, alloc_size - size);
- if (n < 0) {
- if (size) {
- pr_warn("read failed %d: %s\n", errno,
- strerror_r(errno, sbuf, sizeof(sbuf)));
- err = 0;
- } else
- err = -errno;
-
- break;
- }
-
- size += n;
- } while (n > 0);
-
- if (!err) {
- *sizep = size;
- *buf = bf;
+ io__init(&io, io.fd, bf, sizeof(bf));
+ *buf = NULL;
+ err = io__getdelim(&io, buf, sizep, /*delim=*/-1);
+ if (err < 0) {
+ free(*buf);
+ *buf = NULL;
} else
- free(bf);
-
- close(fd);
+ err = 0;
+ close(io.fd);
return err;
}
@@ -400,7 +372,7 @@ int filename__write_int(const char *filename, int value)
char buf[64];
if (fd < 0)
- return err;
+ return -errno;
sprintf(buf, "%d", value);
if (write(fd, buf, sizeof(buf)) == sizeof(buf))
@@ -475,15 +447,22 @@ int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
int sysfs__read_bool(const char *entry, bool *value)
{
- char *buf;
- size_t size;
- int ret;
+ struct io io;
+ char bf[16];
+ int ret = 0;
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
- ret = sysfs__read_str(entry, &buf, &size);
- if (ret < 0)
- return ret;
+ if (!sysfs)
+ return -1;
+
+ snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
+ io.fd = open(path, O_RDONLY);
+ if (io.fd < 0)
+ return -errno;
- switch (buf[0]) {
+ io__init(&io, io.fd, bf, sizeof(bf));
+ switch (io__get_char(&io)) {
case '1':
case 'y':
case 'Y':
@@ -497,8 +476,7 @@ int sysfs__read_bool(const char *entry, bool *value)
default:
ret = -1;
}
-
- free(buf);
+ close(io.fd);
return ret;
}
diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 30745f35d0d2..834fd64c7130 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -69,7 +69,7 @@ char *get_tracing_file(const char *name)
{
char *file;
- if (asprintf(&file, "%s/%s", tracing_path_mount(), name) < 0)
+ if (asprintf(&file, "%s%s", tracing_path_mount(), name) < 0)
return NULL;
return file;
diff --git a/tools/lib/api/io.h b/tools/lib/api/io.h
index 9fc429d2852d..1731996b2c32 100644
--- a/tools/lib/api/io.h
+++ b/tools/lib/api/io.h
@@ -12,6 +12,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <linux/types.h>
struct io {
/* File descriptor being read/ */
@@ -42,48 +43,55 @@ static inline void io__init(struct io *io, int fd,
io->eof = false;
}
-/* Reads one character from the "io" file with similar semantics to fgetc. */
-static inline int io__get_char(struct io *io)
+/* Read from fd filling the buffer. Called when io->data == io->end. */
+static inline int io__fill_buffer(struct io *io)
{
- char *ptr = io->data;
+ ssize_t n;
if (io->eof)
return -1;
- if (ptr == io->end) {
- ssize_t n;
-
- if (io->timeout_ms != 0) {
- struct pollfd pfds[] = {
- {
- .fd = io->fd,
- .events = POLLIN,
- },
- };
-
- n = poll(pfds, 1, io->timeout_ms);
- if (n == 0)
- errno = ETIMEDOUT;
- if (n > 0 && !(pfds[0].revents & POLLIN)) {
- errno = EIO;
- n = -1;
- }
- if (n <= 0) {
- io->eof = true;
- return -1;
- }
+ if (io->timeout_ms != 0) {
+ struct pollfd pfds[] = {
+ {
+ .fd = io->fd,
+ .events = POLLIN,
+ },
+ };
+
+ n = poll(pfds, 1, io->timeout_ms);
+ if (n == 0)
+ errno = ETIMEDOUT;
+ if (n > 0 && !(pfds[0].revents & POLLIN)) {
+ errno = EIO;
+ n = -1;
}
- n = read(io->fd, io->buf, io->buf_len);
-
if (n <= 0) {
io->eof = true;
return -1;
}
- ptr = &io->buf[0];
- io->end = &io->buf[n];
}
- io->data = ptr + 1;
- return *ptr;
+ n = read(io->fd, io->buf, io->buf_len);
+
+ if (n <= 0) {
+ io->eof = true;
+ return -1;
+ }
+ io->data = &io->buf[0];
+ io->end = &io->buf[n];
+ return 0;
+}
+
+/* Reads one character from the "io" file with similar semantics to fgetc. */
+static inline int io__get_char(struct io *io)
+{
+ if (io->data == io->end) {
+ int ret = io__fill_buffer(io);
+
+ if (ret)
+ return ret;
+ }
+ return *io->data++;
}
/* Read a hexadecimal value with no 0x prefix into the out argument hex. If the
@@ -140,8 +148,8 @@ static inline int io__get_dec(struct io *io, __u64 *dec)
}
}
-/* Read up to and including the first newline following the pattern of getline. */
-static inline ssize_t io__getline(struct io *io, char **line_out, size_t *line_len_out)
+/* Read up to and including the first delim. */
+static inline ssize_t io__getdelim(struct io *io, char **line_out, size_t *line_len_out, int delim)
{
char buf[128];
int buf_pos = 0;
@@ -151,7 +159,7 @@ static inline ssize_t io__getline(struct io *io, char **line_out, size_t *line_l
/* TODO: reuse previously allocated memory. */
free(*line_out);
- while (ch != '\n') {
+ while (ch != delim) {
ch = io__get_char(io);
if (ch < 0)
@@ -180,7 +188,14 @@ static inline ssize_t io__getline(struct io *io, char **line_out, size_t *line_l
return line_len;
err_out:
free(line);
+ *line_out = NULL;
+ *line_len_out = 0;
return -ENOMEM;
}
+static inline ssize_t io__getline(struct io *io, char **line_out, size_t *line_len_out)
+{
+ return io__getdelim(io, line_out, line_len_out, /*delim=*/'\n');
+}
+
#endif /* __API_IO__ */
diff --git a/tools/lib/api/io_dir.h b/tools/lib/api/io_dir.h
new file mode 100644
index 000000000000..ef83e967e48c
--- /dev/null
+++ b/tools/lib/api/io_dir.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/*
+ * Lightweight directory reading library.
+ */
+#ifndef __API_IO_DIR__
+#define __API_IO_DIR__
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <linux/limits.h>
+
+#if !defined(SYS_getdents64)
+#if defined(__x86_64__) || defined(__arm__)
+ #define SYS_getdents64 217
+#elif defined(__i386__) || defined(__s390x__) || defined(__sh__)
+ #define SYS_getdents64 220
+#elif defined(__alpha__)
+ #define SYS_getdents64 377
+#elif defined(__mips__)
+ #define SYS_getdents64 308
+#elif defined(__powerpc64__) || defined(__powerpc__)
+ #define SYS_getdents64 202
+#elif defined(__sparc64__) || defined(__sparc__)
+ #define SYS_getdents64 154
+#elif defined(__xtensa__)
+ #define SYS_getdents64 60
+#else
+ #define SYS_getdents64 61
+#endif
+#endif /* !defined(SYS_getdents64) */
+
+static inline ssize_t perf_getdents64(int fd, void *dirp, size_t count)
+{
+#ifdef MEMORY_SANITIZER
+ memset(dirp, 0, count);
+#endif
+ return syscall(SYS_getdents64, fd, dirp, count);
+}
+
+struct io_dirent64 {
+ ino64_t d_ino; /* 64-bit inode number */
+ off64_t d_off; /* 64-bit offset to next structure */
+ unsigned short d_reclen; /* Size of this dirent */
+ unsigned char d_type; /* File type */
+ char d_name[NAME_MAX + 1]; /* Filename (null-terminated) */
+};
+
+struct io_dir {
+ int dirfd;
+ ssize_t available_bytes;
+ struct io_dirent64 *next;
+ struct io_dirent64 buff[4];
+};
+
+static inline void io_dir__init(struct io_dir *iod, int dirfd)
+{
+ iod->dirfd = dirfd;
+ iod->available_bytes = 0;
+}
+
+static inline void io_dir__rewinddir(struct io_dir *iod)
+{
+ lseek(iod->dirfd, 0, SEEK_SET);
+ iod->available_bytes = 0;
+}
+
+static inline struct io_dirent64 *io_dir__readdir(struct io_dir *iod)
+{
+ struct io_dirent64 *entry;
+
+ if (iod->available_bytes <= 0) {
+ ssize_t rc = perf_getdents64(iod->dirfd, iod->buff, sizeof(iod->buff));
+
+ if (rc <= 0)
+ return NULL;
+ iod->available_bytes = rc;
+ iod->next = iod->buff;
+ }
+ entry = iod->next;
+ iod->next = (struct io_dirent64 *)((char *)entry + entry->d_reclen);
+ iod->available_bytes -= entry->d_reclen;
+ return entry;
+}
+
+static inline bool io_dir__is_dir(const struct io_dir *iod, struct io_dirent64 *dent)
+{
+ if (dent->d_type == DT_UNKNOWN) {
+ struct stat st;
+
+ if (fstatat(iod->dirfd, dent->d_name, &st, /*flags=*/0))
+ return false;
+
+ if (S_ISDIR(st.st_mode)) {
+ dent->d_type = DT_DIR;
+ return true;
+ }
+ }
+ return dent->d_type == DT_DIR;
+}
+
+#endif /* __API_IO_DIR__ */
generated by cgit (git 2.34.1) at 2025-12-22 01:18:21 +0000