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Message-ID: <482ed1f6-af6f-b5cd-393f-77d91f24af9d@intel.com>
Date: Wed, 15 Jun 2022 09:50:49 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ian Rogers <irogers@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
Riccardo Mancini <rickyman7@...il.com>,
Dave Marchevsky <davemarchevsky@...com>,
Song Liu <songliubraving@...com>, Leo Yan <leo.yan@...aro.org>,
John Garry <john.garry@...wei.com>,
Florian Fischer <florian.fischer@...q.space>,
Andi Kleen <ak@...ux.intel.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Zechuan Chen <chenzechuan1@...wei.com>,
Yang Jihong <yangjihong1@...wei.com>,
German Gomez <german.gomez@....com>,
Thomas Richter <tmricht@...ux.ibm.com>,
James Clark <james.clark@....com>,
Denis Nikitin <denik@...omium.org>,
Lexi Shao <shaolexi@...wei.com>,
Michael Petlan <mpetlan@...hat.com>,
Remi Bernon <rbernon@...eweavers.com>,
Fangrui Song <maskray@...gle.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc: Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf io: Make open and read calls more robust
On 15/06/22 09:03, Ian Rogers wrote:
> Wrap open and read calls with TEMP_FAILURE_RETRY in case a signal
> causes the syscall to need to restart.
Please expand on why you want this change. Can you give an example
of where it makes a difference?
It looks pretty ugly so maybe making replacement functions or macros
is better e.g.
#define open_retry(a, ...) \
({ long int __result; \
do __result = (long int) open((a), ##__VA_ARGS__); \
while (__result == -1L && errno == EINTR); \
__result; })
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/lib/api/io.h | 3 ++-
> tools/lib/symbol/kallsyms.c | 4 ++-
> tools/perf/builtin-daemon.c | 19 +++++++-------
> tools/perf/builtin-ftrace.c | 18 ++++++-------
> tools/perf/builtin-inject.c | 2 +-
> tools/perf/builtin-kvm.c | 2 +-
> tools/perf/builtin-record.c | 6 ++---
> tools/perf/builtin-sched.c | 2 +-
> tools/perf/builtin-script.c | 2 +-
> tools/perf/util/copyfile.c | 2 +-
> tools/perf/util/data.c | 11 ++++----
> tools/perf/util/dso.c | 6 ++---
> tools/perf/util/evlist.c | 6 ++---
> tools/perf/util/lzma.c | 4 +--
> tools/perf/util/namespaces.c | 5 ++--
> tools/perf/util/parse-events.c | 6 ++---
> tools/perf/util/pmu.c | 12 ++++-----
> tools/perf/util/probe-event.c | 4 +--
> tools/perf/util/probe-file.c | 10 ++++----
> tools/perf/util/session.c | 2 +-
> tools/perf/util/symbol-elf.c | 32 ++++++++++++------------
> tools/perf/util/symbol-minimal.c | 6 ++---
> tools/perf/util/symbol.c | 4 +--
> tools/perf/util/synthetic-events.c | 7 +++---
> tools/perf/util/trace-event-info.c | 6 ++---
> tools/perf/util/trace-event-read.c | 5 ++--
> tools/perf/util/unwind-libunwind-local.c | 4 +--
> tools/perf/util/zlib.c | 5 ++--
> 28 files changed, 102 insertions(+), 93 deletions(-)
>
> diff --git a/tools/lib/api/io.h b/tools/lib/api/io.h
> index 777c20f6b604..b292bbd39fb0 100644
> --- a/tools/lib/api/io.h
> +++ b/tools/lib/api/io.h
> @@ -7,6 +7,7 @@
> #ifndef __API_IO__
> #define __API_IO__
>
> +#include <errno.h>
> #include <stdlib.h>
> #include <unistd.h>
>
> @@ -45,7 +46,7 @@ static inline int io__get_char(struct io *io)
> return -1;
>
> if (ptr == io->end) {
> - ssize_t n = read(io->fd, io->buf, io->buf_len);
> + ssize_t n = TEMP_FAILURE_RETRY(read(io->fd, io->buf, io->buf_len));
>
> if (n <= 0) {
> io->eof = true;
> diff --git a/tools/lib/symbol/kallsyms.c b/tools/lib/symbol/kallsyms.c
> index e335ac2b9e19..5436c038c379 100644
> --- a/tools/lib/symbol/kallsyms.c
> +++ b/tools/lib/symbol/kallsyms.c
> @@ -3,7 +3,9 @@
> #include "api/io.h"
> #include <stdio.h>
> #include <sys/stat.h>
> +#include <errno.h>
> #include <fcntl.h>
> +#include <unistd.h>
>
> u8 kallsyms2elf_type(char type)
> {
> @@ -36,7 +38,7 @@ int kallsyms__parse(const char *filename, void *arg,
> char bf[BUFSIZ];
> int err;
>
> - io.fd = open(filename, O_RDONLY, 0);
> + io.fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY, 0));
>
> if (io.fd < 0)
> return -1;
> diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> index 6cb3f6cc36d0..d4e1a5636056 100644
> --- a/tools/perf/builtin-daemon.c
> +++ b/tools/perf/builtin-daemon.c
> @@ -351,7 +351,7 @@ static int daemon_session__run(struct daemon_session *session,
> return -1;
> }
>
> - fd = open("/dev/null", O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
> if (fd < 0) {
> perror("failed: open /dev/null");
> return -1;
> @@ -360,7 +360,7 @@ static int daemon_session__run(struct daemon_session *session,
> dup2(fd, 0);
> close(fd);
>
> - fd = open(SESSION_OUTPUT, O_RDWR|O_CREAT|O_TRUNC, 0644);
> + fd = TEMP_FAILURE_RETRY(open(SESSION_OUTPUT, O_RDWR|O_CREAT|O_TRUNC, 0644));
> if (fd < 0) {
> perror("failed: open session output");
> return -1;
> @@ -405,7 +405,8 @@ static pid_t handle_signalfd(struct daemon *daemon)
> * coalesced in kernel and we can receive only single signal even
> * if multiple SIGCHLD were generated.
> */
> - err = read(daemon->signal_fd, &si, sizeof(struct signalfd_siginfo));
> + err = TEMP_FAILURE_RETRY(read(daemon->signal_fd, &si,
> + sizeof(struct signalfd_siginfo)));
> if (err != sizeof(struct signalfd_siginfo)) {
> pr_err("failed to read signal fd\n");
> return -1;
> @@ -522,7 +523,7 @@ static int daemon_session__control(struct daemon_session *session,
> scnprintf(control_path, sizeof(control_path), "%s/%s",
> session->base, SESSION_CONTROL);
>
> - control = open(control_path, O_WRONLY|O_NONBLOCK);
> + control = TEMP_FAILURE_RETRY(open(control_path, O_WRONLY|O_NONBLOCK));
> if (!control)
> return -1;
>
> @@ -531,7 +532,7 @@ static int daemon_session__control(struct daemon_session *session,
> scnprintf(ack_path, sizeof(ack_path), "%s/%s",
> session->base, SESSION_ACK);
>
> - ack = open(ack_path, O_RDONLY, O_NONBLOCK);
> + ack = TEMP_FAILURE_RETRY(open(ack_path, O_RDONLY, O_NONBLOCK));
> if (!ack) {
> close(control);
> return -1;
> @@ -564,7 +565,7 @@ static int daemon_session__control(struct daemon_session *session,
> goto out;
> }
>
> - err = read(ack, buf, sizeof(buf));
> + err = TEMP_FAILURE_RETRY(read(ack, buf, sizeof(buf)));
> if (err > 0)
> ret = strcmp(buf, "ack\n");
> else
> @@ -1078,7 +1079,7 @@ static int handle_config_changes(struct daemon *daemon, int conf_fd,
> ssize_t len;
>
> while (!(*config_changed)) {
> - len = read(conf_fd, buf, sizeof(buf));
> + len = TEMP_FAILURE_RETRY(read(conf_fd, buf, sizeof(buf)));
> if (len == -1) {
> if (errno != EAGAIN) {
> perror("failed: read");
> @@ -1147,7 +1148,7 @@ static int check_lock(struct daemon *daemon)
>
> scnprintf(path, sizeof(path), "%s/lock", daemon->base);
>
> - fd = open(path, O_RDWR|O_CREAT|O_CLOEXEC, 0640);
> + fd = TEMP_FAILURE_RETRY(open(path, O_RDWR|O_CREAT|O_CLOEXEC, 0640));
> if (fd < 0)
> return -1;
>
> @@ -1201,7 +1202,7 @@ static int go_background(struct daemon *daemon)
> return -1;
> }
>
> - fd = open("output", O_RDWR|O_CREAT|O_TRUNC, 0644);
> + fd = TEMP_FAILURE_RETRY(open("output", O_RDWR|O_CREAT|O_TRUNC, 0644));
> if (fd < 0) {
> perror("failed: open");
> return -1;
> diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> index 7de07bb16d23..7553e20f38b2 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -79,7 +79,7 @@ static int __write_tracing_file(const char *name, const char *val, bool append)
> else
> flags |= O_TRUNC;
>
> - fd = open(file, flags);
> + fd = TEMP_FAILURE_RETRY(open(file, flags));
> if (fd < 0) {
> pr_debug("cannot open tracing file: %s: %s\n",
> name, str_error_r(errno, errbuf, sizeof(errbuf)));
> @@ -132,7 +132,7 @@ static int read_tracing_file_to_stdout(const char *name)
> return -1;
> }
>
> - fd = open(file, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(file, O_RDONLY));
> if (fd < 0) {
> pr_debug("cannot open tracing file: %s: %s\n",
> name, str_error_r(errno, buf, sizeof(buf)));
> @@ -141,7 +141,7 @@ static int read_tracing_file_to_stdout(const char *name)
>
> /* read contents to stdout */
> while (true) {
> - int n = read(fd, buf, sizeof(buf));
> + int n = TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf)));
> if (n == 0)
> break;
> else if (n < 0)
> @@ -608,7 +608,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace)
> goto out_reset;
> }
>
> - trace_fd = open(trace_file, O_RDONLY);
> + trace_fd = TEMP_FAILURE_RETRY(open(trace_file, O_RDONLY));
>
> put_tracing_file(trace_file);
>
> @@ -645,7 +645,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace)
> break;
>
> if (pollfd.revents & POLLIN) {
> - int n = read(trace_fd, buf, sizeof(buf));
> + int n = TEMP_FAILURE_RETRY(read(trace_fd, buf, sizeof(buf)));
> if (n < 0)
> break;
> if (fwrite(buf, n, 1, stdout) != 1)
> @@ -665,7 +665,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace)
>
> /* read remaining buffer contents */
> while (true) {
> - int n = read(trace_fd, buf, sizeof(buf));
> + int n = TEMP_FAILURE_RETRY(read(trace_fd, buf, sizeof(buf)));
> if (n <= 0)
> break;
> if (fwrite(buf, n, 1, stdout) != 1)
> @@ -826,7 +826,7 @@ static int prepare_func_latency(struct perf_ftrace *ftrace)
> return -1;
> }
>
> - fd = open(trace_file, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(trace_file, O_RDONLY));
> if (fd < 0)
> pr_err("failed to open trace_pipe\n");
>
> @@ -913,7 +913,7 @@ static int __cmd_latency(struct perf_ftrace *ftrace)
> break;
>
> if (pollfd.revents & POLLIN) {
> - int n = read(trace_fd, buf, sizeof(buf) - 1);
> + int n = TEMP_FAILURE_RETRY(read(trace_fd, buf, sizeof(buf) - 1));
> if (n < 0)
> break;
>
> @@ -931,7 +931,7 @@ static int __cmd_latency(struct perf_ftrace *ftrace)
>
> /* read remaining buffer contents */
> while (!ftrace->target.use_bpf) {
> - int n = read(trace_fd, buf, sizeof(buf) - 1);
> + int n = TEMP_FAILURE_RETRY(read(trace_fd, buf, sizeof(buf) - 1));
> if (n <= 0)
> break;
> make_histogram(buckets, buf, n, line, ftrace->use_nsec);
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index a75bf11585b5..960b4a50583e 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -155,7 +155,7 @@ static int copy_bytes(struct perf_inject *inject, int fd, off_t size)
> int ret;
>
> while (size > 0) {
> - ssz = read(fd, buf, min(size, (off_t)sizeof(buf)));
> + ssz = TEMP_FAILURE_RETRY(read(fd, buf, min(size, (off_t)sizeof(buf))));
> if (ssz < 0)
> return -errno;
> ret = output_bytes(inject, buf, ssz);
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 3696ae97f149..4dd8292d1941 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -880,7 +880,7 @@ static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
> uint64_t c;
> int rc;
>
> - rc = read(kvm->timerfd, &c, sizeof(uint64_t));
> + rc = TEMP_FAILURE_RETRY(read(kvm->timerfd, &c, sizeof(uint64_t)));
> if (rc < 0) {
> if (errno == EAGAIN)
> return 0;
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 9a71f0330137..361610bc96b6 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -902,7 +902,7 @@ static bool record__kcore_readable(struct machine *machine)
>
> scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
>
> - fd = open(kcore, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(kcore, O_RDONLY));
> if (fd < 0)
> return false;
>
> @@ -2049,7 +2049,7 @@ static int record__terminate_thread(struct record_thread *thread_data)
>
> close(thread_data->pipes.msg[1]);
> thread_data->pipes.msg[1] = -1;
> - err = read(thread_data->pipes.ack[0], &ack, sizeof(ack));
> + err = TEMP_FAILURE_RETRY(read(thread_data->pipes.ack[0], &ack, sizeof(ack)));
> if (err > 0)
> pr_debug2("threads[%d]: sent %s\n", tid, thread_msg_tags[ack]);
> else
> @@ -2097,7 +2097,7 @@ static int record__start_threads(struct record *rec)
> goto out_err;
> }
>
> - err = read(thread_data[t].pipes.ack[0], &msg, sizeof(msg));
> + err = TEMP_FAILURE_RETRY(read(thread_data[t].pipes.ack[0], &msg, sizeof(msg)));
> if (err > 0)
> pr_debug2("threads[%d]: sent %s\n", rec->thread_data[t].tid,
> thread_msg_tags[msg]);
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 646bd938927a..149787268d02 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -604,7 +604,7 @@ static u64 get_cpu_usage_nsec_self(int fd)
> u64 runtime;
> int ret;
>
> - ret = read(fd, &runtime, sizeof(runtime));
> + ret = TEMP_FAILURE_RETRY(read(fd, &runtime, sizeof(runtime)));
> BUG_ON(ret != sizeof(runtime));
>
> return runtime;
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index c689054002cc..844f5350bfdf 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -4207,7 +4207,7 @@ int cmd_script(int argc, const char **argv)
> goto out_delete;
> }
>
> - input = open(data.path, O_RDONLY); /* input_name */
> + input = TEMP_FAILURE_RETRY(open(data.path, O_RDONLY)); /* input_name */
> if (input < 0) {
> err = -errno;
> perror("failed to open file");
> diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
> index 47e03de7c235..c7bff4943936 100644
> --- a/tools/perf/util/copyfile.c
> +++ b/tools/perf/util/copyfile.c
> @@ -112,7 +112,7 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
> goto out_close_to;
>
> nsinfo__mountns_enter(nsi, &nsc);
> - fromfd = open(from, O_RDONLY);
> + fromfd = TEMP_FAILURE_RETRY(open(from, O_RDONLY));
> nsinfo__mountns_exit(&nsc);
> if (fromfd < 0)
> goto out_close_to;
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index caabeac24c69..a9066a3d914f 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -53,7 +53,8 @@ int perf_data__create_dir(struct perf_data *data, int nr)
> goto out_err;
> }
>
> - ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
> + ret = TEMP_FAILURE_RETRY(open(file->path, O_RDWR|O_CREAT|O_TRUNC,
> + S_IRUSR|S_IWUSR));
> if (ret < 0) {
> ret = -errno;
> goto out_err;
> @@ -123,7 +124,7 @@ int perf_data__open_dir(struct perf_data *data)
> if (!file->path)
> goto out_err;
>
> - ret = open(file->path, O_RDONLY);
> + ret = TEMP_FAILURE_RETRY(open(file->path, O_RDONLY));
> if (ret < 0)
> goto out_err;
>
> @@ -248,7 +249,7 @@ static int open_file_read(struct perf_data *data)
> int fd;
> char sbuf[STRERR_BUFSIZE];
>
> - fd = open(data->file.path, flags);
> + fd = TEMP_FAILURE_RETRY(open(data->file.path, flags));
> if (fd < 0) {
> int err = errno;
>
> @@ -288,8 +289,8 @@ static int open_file_write(struct perf_data *data)
> int fd;
> char sbuf[STRERR_BUFSIZE];
>
> - fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
> - S_IRUSR|S_IWUSR);
> + fd = TEMP_FAILURE_RETRY(open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
> + S_IRUSR|S_IWUSR));
>
> if (fd < 0)
> pr_err("failed to open %s : %s\n", data->file.path,
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 5ac13958d1bd..40befa2429f9 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -300,7 +300,7 @@ int filename__decompress(const char *name, char *pathname,
> * descriptor to the uncompressed file.
> */
> if (!compressions[comp].is_compressed(name))
> - return open(name, O_RDONLY);
> + return TEMP_FAILURE_RETRY(open(name, O_RDONLY));
>
> fd = mkstemp(tmpbuf);
> if (fd < 0) {
> @@ -476,7 +476,7 @@ static int do_open(char *name)
> char sbuf[STRERR_BUFSIZE];
>
> do {
> - fd = open(name, O_RDONLY|O_CLOEXEC);
> + fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY|O_CLOEXEC));
> if (fd >= 0)
> return fd;
>
> @@ -898,7 +898,7 @@ static ssize_t file_read(struct dso *dso, struct machine *machine,
> goto out;
> }
>
> - ret = pread(dso->data.fd, data, DSO__DATA_CACHE_SIZE, offset);
> + ret = TEMP_FAILURE_RETRY(pread(dso->data.fd, data, DSO__DATA_CACHE_SIZE, offset));
> out:
> pthread_mutex_unlock(&dso__data_open_lock);
> return ret;
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 48af7d379d82..ba0dcdf91120 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1440,7 +1440,7 @@ int evlist__prepare_workload(struct evlist *evlist, struct target *target, const
> /*
> * Wait until the parent tells us to go.
> */
> - ret = read(go_pipe[0], &bf, 1);
> + ret = TEMP_FAILURE_RETRY(read(go_pipe[0], &bf, 1));
> /*
> * The parent will ask for the execvp() to be performed by
> * writing exactly one byte, in workload.cork_fd, usually via
> @@ -1837,7 +1837,7 @@ static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_
> * O_RDWR avoids POLLHUPs which is necessary to allow the other
> * end of a FIFO to be repeatedly opened and closed.
> */
> - fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
> + fd = TEMP_FAILURE_RETRY(open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC));
> if (fd < 0) {
> pr_err("Failed to open '%s'\n", s);
> ret = -errno;
> @@ -1848,7 +1848,7 @@ static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_
>
> if (p && *++p) {
> /* O_RDWR | O_NONBLOCK means the other end need not be open */
> - fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
> + fd = TEMP_FAILURE_RETRY(open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC));
> if (fd < 0) {
> pr_err("Failed to open '%s'\n", p);
> ret = -errno;
> diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
> index 51424cdc3b68..93e0a6a53e28 100644
> --- a/tools/perf/util/lzma.c
> +++ b/tools/perf/util/lzma.c
> @@ -109,7 +109,7 @@ int lzma_decompress_to_file(const char *input, int output_fd)
>
> bool lzma_is_compressed(const char *input)
> {
> - int fd = open(input, O_RDONLY);
> + int fd = TEMP_FAILURE_RETRY(open(input, O_RDONLY));
> const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
> char buf[6] = { 0 };
> ssize_t rc;
> @@ -117,7 +117,7 @@ bool lzma_is_compressed(const char *input)
> if (fd < 0)
> return -1;
>
> - rc = read(fd, buf, sizeof(buf));
> + rc = TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf)));
> close(fd);
> return rc == sizeof(buf) ?
> memcmp(buf, magic, sizeof(buf)) == 0 : false;
> diff --git a/tools/perf/util/namespaces.c b/tools/perf/util/namespaces.c
> index dd536220cdb9..89edfba6af06 100644
> --- a/tools/perf/util/namespaces.c
> +++ b/tools/perf/util/namespaces.c
> @@ -9,6 +9,7 @@
> #include "get_current_dir_name.h"
> #include <sys/types.h>
> #include <sys/stat.h>
> +#include <errno.h>
> #include <fcntl.h>
> #include <limits.h>
> #include <sched.h>
> @@ -266,11 +267,11 @@ void nsinfo__mountns_enter(struct nsinfo *nsi,
> if (!oldcwd)
> return;
>
> - oldns = open(curpath, O_RDONLY);
> + oldns = TEMP_FAILURE_RETRY(open(curpath, O_RDONLY));
> if (oldns < 0)
> goto errout;
>
> - newns = open(nsi->mntns_path, O_RDONLY);
> + newns = TEMP_FAILURE_RETRY(open(nsi->mntns_path, O_RDONLY));
> if (newns < 0)
> goto errout;
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 7ed235740431..75f8f2e44195 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -189,7 +189,7 @@ static int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
> int fd;
>
> snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
> - fd = open(evt_path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(evt_path, O_RDONLY));
> if (fd < 0)
> return -EINVAL;
> close(fd);
> @@ -233,10 +233,10 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
>
> scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
> evt_dirent->d_name);
> - fd = open(evt_path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(evt_path, O_RDONLY));
> if (fd < 0)
> continue;
> - if (read(fd, id_buf, sizeof(id_buf)) < 0) {
> + if (TEMP_FAILURE_RETRY(read(fd, id_buf, sizeof(id_buf))) < 0) {
> close(fd);
> continue;
> }
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 9a1c7e63e663..59252cfc2b5b 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -154,14 +154,14 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
>
> scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
>
> - fd = open(path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
> if (fd == -1)
> return -1;
>
> if (fstat(fd, &st) < 0)
> goto error;
>
> - sret = read(fd, scale, sizeof(scale)-1);
> + sret = TEMP_FAILURE_RETRY(read(fd, scale, sizeof(scale)-1));
> if (sret < 0)
> goto error;
>
> @@ -184,11 +184,11 @@ static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *n
>
> scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
>
> - fd = open(path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
> if (fd == -1)
> return -1;
>
> - sret = read(fd, alias->unit, UNIT_MAX_LEN);
> + sret = TEMP_FAILURE_RETRY(read(fd, alias->unit, UNIT_MAX_LEN));
> if (sret < 0)
> goto error;
>
> @@ -214,7 +214,7 @@ perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
>
> scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
>
> - fd = open(path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
> if (fd == -1)
> return -1;
>
> @@ -232,7 +232,7 @@ static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
>
> scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
>
> - fd = open(path, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
> if (fd == -1)
> return -1;
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 062b5cbe67af..7838889f55df 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -276,7 +276,7 @@ static char *find_module_name(const char *module)
> char *mod_name = NULL;
> int name_offset;
>
> - fd = open(module, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(module, O_RDONLY));
> if (fd < 0)
> return NULL;
>
> @@ -598,7 +598,7 @@ static int get_text_start_address(const char *exec, u64 *address,
> struct nscookie nsc;
>
> nsinfo__mountns_enter(nsi, &nsc);
> - fd = open(exec, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(exec, O_RDONLY));
> nsinfo__mountns_exit(&nsc);
> if (fd < 0)
> return -errno;
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index 3d50de3217d5..b788932656e8 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -115,9 +115,9 @@ int open_trace_file(const char *trace_file, bool readwrite)
> if (ret >= 0) {
> pr_debug("Opening %s write=%d\n", buf, readwrite);
> if (readwrite && !probe_event_dry_run)
> - ret = open(buf, O_RDWR | O_APPEND, 0);
> + ret = TEMP_FAILURE_RETRY(open(buf, O_RDWR | O_APPEND, 0));
> else
> - ret = open(buf, O_RDONLY, 0);
> + ret = TEMP_FAILURE_RETRY(open(buf, O_RDONLY, 0));
>
> if (ret < 0)
> ret = -errno;
> @@ -180,7 +180,7 @@ struct strlist *probe_file__get_rawlist(int fd)
> if (sl == NULL)
> return NULL;
>
> - fddup = dup(fd);
> + fddup = TEMP_FAILURE_RETRY(dup(fd));
> if (fddup < 0)
> goto out_free_sl;
>
> @@ -498,7 +498,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target,
> }
>
> snprintf(cpath, PATH_MAX, "%s/probes", dir_name);
> - fd = open(cpath, O_CREAT | O_RDWR, 0644);
> + fd = TEMP_FAILURE_RETRY(open(cpath, O_CREAT | O_RDWR, 0644));
> if (fd < 0)
> pr_debug("Failed to open cache(%d): %s\n", fd, cpath);
> free(dir_name);
> @@ -514,7 +514,7 @@ static int probe_cache__load(struct probe_cache *pcache)
> int ret = 0, fddup;
> FILE *fp;
>
> - fddup = dup(pcache->fd);
> + fddup = TEMP_FAILURE_RETRY(dup(pcache->fd));
> if (fddup < 0)
> return -errno;
> fp = fdopen(fddup, "r");
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 0acb9de54b06..b2fc389cc530 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -384,7 +384,7 @@ static int skipn(int fd, off_t n)
> ssize_t ret;
>
> while (n > 0) {
> - ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
> + ret = TEMP_FAILURE_RETRY(read(fd, buf, min(n, (off_t)sizeof(buf))));
> if (ret <= 0)
> return ret;
> n -= ret;
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index ecd377938eea..02556070a2ce 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -577,7 +577,7 @@ static int read_build_id(const char *filename, struct build_id *bid)
> if (size < BUILD_ID_SIZE)
> goto out;
>
> - fd = open(filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
> if (fd < 0)
> goto out;
>
> @@ -638,7 +638,7 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> size_t size = sizeof(bid->data);
> int fd, err = -1;
>
> - fd = open(filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
> if (fd < 0)
> goto out;
>
> @@ -647,24 +647,24 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> GElf_Nhdr nhdr;
> size_t namesz, descsz;
>
> - if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
> + if (TEMP_FAILURE_RETRY(read(fd, &nhdr, sizeof(nhdr))) != sizeof(nhdr))
> break;
>
> namesz = NOTE_ALIGN(nhdr.n_namesz);
> descsz = NOTE_ALIGN(nhdr.n_descsz);
> if (nhdr.n_type == NT_GNU_BUILD_ID &&
> nhdr.n_namesz == sizeof("GNU")) {
> - if (read(fd, bf, namesz) != (ssize_t)namesz)
> + if (TEMP_FAILURE_RETRY(read(fd, bf, namesz)) != (ssize_t)namesz)
> break;
> if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
> size_t sz = min(descsz, size);
> - if (read(fd, bid->data, sz) == (ssize_t)sz) {
> + if (TEMP_FAILURE_RETRY(read(fd, bid->data, sz)) == (ssize_t)sz) {
> memset(bid->data + sz, 0, size - sz);
> bid->size = sz;
> err = 0;
> break;
> }
> - } else if (read(fd, bf, descsz) != (ssize_t)descsz)
> + } else if (TEMP_FAILURE_RETRY(read(fd, bf, descsz)) != (ssize_t)descsz)
> break;
> } else {
> int n = namesz + descsz;
> @@ -674,7 +674,7 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n",
> __func__, filename, nhdr.n_namesz, nhdr.n_descsz);
> }
> - if (read(fd, bf, n) != n)
> + if (TEMP_FAILURE_RETRY(read(fd, bf, n)) != n)
> break;
> }
> }
> @@ -732,7 +732,7 @@ int filename__read_debuglink(const char *filename, char *debuglink,
> Elf_Scn *sec;
> Elf_Kind ek;
>
> - fd = open(filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
> if (fd < 0)
> goto out;
>
> @@ -844,7 +844,7 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
>
> type = dso->symtab_type;
> } else {
> - fd = open(name, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY));
> if (fd < 0) {
> dso->load_errno = errno;
> return -1;
> @@ -1454,7 +1454,7 @@ static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len)
> if (len < n)
> n = len;
> /* Use read because mmap won't work on proc files */
> - r = read(from, buf, n);
> + r = TEMP_FAILURE_RETRY(read(from, buf, n));
> if (r < 0)
> goto out;
> if (!r)
> @@ -1485,7 +1485,7 @@ static int kcore__open(struct kcore *kcore, const char *filename)
> {
> GElf_Ehdr *ehdr;
>
> - kcore->fd = open(filename, O_RDONLY);
> + kcore->fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
> if (kcore->fd == -1)
> return -1;
>
> @@ -1518,7 +1518,7 @@ static int kcore__init(struct kcore *kcore, char *filename, int elfclass,
> if (temp)
> kcore->fd = mkstemp(filename);
> else
> - kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400);
> + kcore->fd = TEMP_FAILURE_RETRY(open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400));
> if (kcore->fd == -1)
> return -1;
>
> @@ -1966,7 +1966,7 @@ static int kcore_copy__compare_fds(int from, int to)
>
> while (1) {
> /* Use read because mmap won't work on proc files */
> - ret = read(from, buf_from, page_size);
> + ret = TEMP_FAILURE_RETRY(read(from, buf_from, page_size));
> if (ret < 0)
> goto out;
>
> @@ -1994,11 +1994,11 @@ static int kcore_copy__compare_files(const char *from_filename,
> {
> int from, to, err = -1;
>
> - from = open(from_filename, O_RDONLY);
> + from = TEMP_FAILURE_RETRY(open(from_filename, O_RDONLY));
> if (from < 0)
> return -1;
>
> - to = open(to_filename, O_RDONLY);
> + to = TEMP_FAILURE_RETRY(open(to_filename, O_RDONLY));
> if (to < 0)
> goto out_close_from;
>
> @@ -2419,7 +2419,7 @@ int get_sdt_note_list(struct list_head *head, const char *target)
> Elf *elf;
> int fd, ret;
>
> - fd = open(target, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(target, O_RDONLY));
> if (fd < 0)
> return -EBADF;
>
> diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c
> index f9eb0bee7f15..7e25d476b1b2 100644
> --- a/tools/perf/util/symbol-minimal.c
> +++ b/tools/perf/util/symbol-minimal.c
> @@ -230,7 +230,7 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> size_t buf_size;
> void *buf;
>
> - fd = open(filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
> if (fd < 0)
> return -1;
>
> @@ -242,7 +242,7 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> if (buf == NULL)
> goto out;
>
> - if (read(fd, buf, buf_size) != (ssize_t) buf_size)
> + if (TEMP_FAILURE_RETRY(read(fd, buf, buf_size)) != (ssize_t) buf_size)
> goto out_free;
>
> ret = read_build_id(buf, buf_size, bid, false);
> @@ -256,7 +256,7 @@ int sysfs__read_build_id(const char *filename, struct build_id *bid)
> int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
> enum dso_binary_type type)
> {
> - int fd = open(name, O_RDONLY);
> + int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY));
> if (fd < 0)
> goto out_errno;
>
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index f72baf636724..5212667ea67d 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1335,7 +1335,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
> md.dso = dso;
> INIT_LIST_HEAD(&md.maps);
>
> - fd = open(kcore_filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(kcore_filename, O_RDONLY));
> if (fd < 0) {
> pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
> kcore_filename);
> @@ -2156,7 +2156,7 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
> */
> static bool filename__readable(const char *file)
> {
> - int fd = open(file, O_RDONLY);
> + int fd = TEMP_FAILURE_RETRY(open(file, O_RDONLY));
> if (fd < 0)
> return false;
> close(fd);
> diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> index 76beda3e1a10..9dcc268bd69c 100644
> --- a/tools/perf/util/synthetic-events.c
> +++ b/tools/perf/util/synthetic-events.c
> @@ -40,6 +40,7 @@
> #include <api/io.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> +#include <errno.h>
> #include <fcntl.h>
> #include <unistd.h>
>
> @@ -86,13 +87,13 @@ static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len
> else
> snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
>
> - fd = open(bf, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(bf, O_RDONLY));
> if (fd < 0) {
> pr_debug("couldn't open %s\n", bf);
> return -1;
> }
>
> - n = read(fd, bf, sizeof(bf) - 1);
> + n = TEMP_FAILURE_RETRY(read(fd, bf, sizeof(bf) - 1));
> close(fd);
> if (n <= 0) {
> pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
> @@ -410,7 +411,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
> machine->root_dir, pid, pid);
>
> - io.fd = open(bf, O_RDONLY, 0);
> + io.fd = TEMP_FAILURE_RETRY(open(bf, O_RDONLY, 0));
> if (io.fd < 0) {
> /*
> * We raced with a task exiting - just return:
> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
> index a65f65d0857e..c917a4217c6f 100644
> --- a/tools/perf/util/trace-event-info.c
> +++ b/tools/perf/util/trace-event-info.c
> @@ -48,7 +48,7 @@ static int record_file(const char *file, ssize_t hdr_sz)
> int r, fd;
> int err = -EIO;
>
> - fd = open(file, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(file, O_RDONLY));
> if (fd < 0) {
> pr_debug("Can't read '%s'", file);
> return -errno;
> @@ -61,7 +61,7 @@ static int record_file(const char *file, ssize_t hdr_sz)
> }
>
> do {
> - r = read(fd, buf, BUFSIZ);
> + r = TEMP_FAILURE_RETRY(read(fd, buf, BUFSIZ));
> if (r > 0) {
> size += r;
> if (write(output_fd, buf, r) != r)
> @@ -519,7 +519,7 @@ struct tracing_data *tracing_data_get(struct list_head *pattrs,
> return NULL;
> }
>
> - temp_fd = open(tdata->temp_file, O_RDWR);
> + temp_fd = TEMP_FAILURE_RETRY(open(tdata->temp_file, O_RDWR));
> if (temp_fd < 0) {
> pr_debug("Can't read '%s'", tdata->temp_file);
> free(tdata);
> diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
> index 8a01af783310..7086770ec225 100644
> --- a/tools/perf/util/trace-event-read.c
> +++ b/tools/perf/util/trace-event-read.c
> @@ -11,6 +11,7 @@
> #include <sys/stat.h>
> #include <sys/wait.h>
> #include <sys/mman.h>
> +#include <errno.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <errno.h>
> @@ -28,7 +29,7 @@ static int __do_read(int fd, void *buf, int size)
> int rsize = size;
>
> while (size) {
> - int ret = read(fd, buf, size);
> + int ret = TEMP_FAILURE_RETRY(read(fd, buf, size));
>
> if (ret <= 0)
> return -1;
> @@ -105,7 +106,7 @@ static char *read_string(void)
> char c;
>
> for (;;) {
> - r = read(input_fd, &c, 1);
> + r = TEMP_FAILURE_RETRY(read(input_fd, &c, 1));
> if (r < 0) {
> pr_debug("reading input file");
> goto out;
> diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
> index 37622699c91a..2ece387a73c6 100644
> --- a/tools/perf/util/unwind-libunwind-local.c
> +++ b/tools/perf/util/unwind-libunwind-local.c
> @@ -362,7 +362,7 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
> }
>
> if (ofs <= 0) {
> - fd = open(dso->symsrc_filename, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(dso->symsrc_filename, O_RDONLY));
> if (fd >= 0) {
> ofs = elf_section_offset(fd, ".debug_frame");
> close(fd);
> @@ -377,7 +377,7 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
> dso, DSO_BINARY_TYPE__DEBUGLINK,
> machine->root_dir, debuglink, PATH_MAX);
> if (!ret) {
> - fd = open(debuglink, O_RDONLY);
> + fd = TEMP_FAILURE_RETRY(open(debuglink, O_RDONLY));
> if (fd >= 0) {
> ofs = elf_section_offset(fd,
> ".debug_frame");
> diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c
> index 78d2297c1b67..f4563ea094c8 100644
> --- a/tools/perf/util/zlib.c
> +++ b/tools/perf/util/zlib.c
> @@ -1,4 +1,5 @@
> // SPDX-License-Identifier: GPL-2.0
> +#include <errno.h>
> #include <fcntl.h>
> #include <stdio.h>
> #include <string.h>
> @@ -82,7 +83,7 @@ int gzip_decompress_to_file(const char *input, int output_fd)
>
> bool gzip_is_compressed(const char *input)
> {
> - int fd = open(input, O_RDONLY);
> + int fd = TEMP_FAILURE_RETRY(open(input, O_RDONLY));
> const uint8_t magic[2] = { 0x1f, 0x8b };
> char buf[2] = { 0 };
> ssize_t rc;
> @@ -90,7 +91,7 @@ bool gzip_is_compressed(const char *input)
> if (fd < 0)
> return -1;
>
> - rc = read(fd, buf, sizeof(buf));
> + rc = TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf)));
> close(fd);
> return rc == sizeof(buf) ?
> memcmp(buf, magic, sizeof(buf)) == 0 : false;
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