perf util: Replace strerror with strerror_r for thread-safety

Replaces all strerror with strerror_r in util for making the perf lib
thread-safe.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naohiro Aota <naota@elisp.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20140814022236.3545.3367.stgit@kbuild-fedora.novalocal
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

8 files changed, 36 insertions, 14 deletions

diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
index 4945aa56a017..47b78b3f0325 100644
--- a/tools/perf/util/cloexec.c
+++ b/tools/perf/util/cloexec.c
@@ -3,6 +3,7 @@
 #include "../perf.h"
 #include "cloexec.h"
 #include "asm/bug.h"
+#include "debug.h"
 
 static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
 
@@ -18,6 +19,7 @@ static int perf_flag_probe(void)
         int err;
         int cpu;
         pid_t pid = -1;
+        char sbuf[STRERR_BUFSIZE];
 
         cpu = sched_getcpu();
         if (cpu < 0)
@@ -42,7 +44,7 @@ static int perf_flag_probe(void)
 
         WARN_ONCE(err != EINVAL && err != EBUSY,
                   "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
-                  err, strerror(err));
+                  err, strerror_r(err, sbuf, sizeof(sbuf)));
 
         /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
         fd = sys_perf_event_open(&attr, pid, cpu, -1, 0);
@@ -50,7 +52,7 @@ static int perf_flag_probe(void)
 
         if (WARN_ONCE(fd < 0 && err != EBUSY,
                       "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
-                      err, strerror(err)))
+                      err, strerror_r(err, sbuf, sizeof(sbuf))))
                 return -1;
 
         close(fd);
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 29d720cf5844..1921942fc2e0 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -50,12 +50,14 @@ static int open_file_read(struct perf_data_file *file)
 {
         struct stat st;
         int fd;
+        char sbuf[STRERR_BUFSIZE];
 
         fd = open(file->path, O_RDONLY);
         if (fd < 0) {
                 int err = errno;
 
-                pr_err("failed to open %s: %s", file->path, strerror(err));
+                pr_err("failed to open %s: %s", file->path,
+                        strerror_r(err, sbuf, sizeof(sbuf)));
                 if (err == ENOENT && !strcmp(file->path, "perf.data"))
                         pr_err("  (try 'perf record' first)");
                 pr_err("\n");
@@ -88,6 +90,7 @@ static int open_file_read(struct perf_data_file *file)
 static int open_file_write(struct perf_data_file *file)
 {
         int fd;
+        char sbuf[STRERR_BUFSIZE];
 
         if (check_backup(file))
                 return -1;
@@ -95,7 +98,8 @@ static int open_file_write(struct perf_data_file *file)
         fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
 
         if (fd < 0)
-                pr_err("failed to open %s : %s\n", file->path, strerror(errno));
+                pr_err("failed to open %s : %s\n", file->path,
+                        strerror_r(errno, sbuf, sizeof(sbuf)));
 
         return fd;
 }
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index bdafd306fb52..55e39dc1bcda 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -162,13 +162,15 @@ static void close_first_dso(void);
 static int do_open(char *name)
 {
         int fd;
+        char sbuf[STRERR_BUFSIZE];
 
         do {
                 fd = open(name, O_RDONLY);
                 if (fd >= 0)
                         return fd;
 
-                pr_debug("dso open failed, mmap: %s\n", strerror(errno));
+                pr_debug("dso open failed, mmap: %s\n",
+                         strerror_r(errno, sbuf, sizeof(sbuf)));
                 if (!dso__data_open_cnt || errno != EMFILE)
                         break;
 
@@ -530,10 +532,12 @@ static ssize_t cached_read(struct dso *dso, u64 offset, u8 *data, ssize_t size)
 static int data_file_size(struct dso *dso)
 {
         struct stat st;
+        char sbuf[STRERR_BUFSIZE];
 
         if (!dso->data.file_size) {
                 if (fstat(dso->data.fd, &st)) {
-                        pr_err("dso mmap failed, fstat: %s\n", strerror(errno));
+                        pr_err("dso mmap failed, fstat: %s\n",
+                                strerror_r(errno, sbuf, sizeof(sbuf)));
                         return -1;
                 }
                 dso->data.file_size = st.st_size;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5dcd28c79c6e..a3e28b49128a 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1295,7 +1295,7 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
                                int err, char *buf, size_t size)
 {
         int printed, value;
-        char sbuf[128], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
+        char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
 
         switch (err) {
         case EACCES:
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 01ce14c3575e..b38de5819323 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2027,6 +2027,8 @@ bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
                               int err, char *msg, size_t size)
 {
+        char sbuf[STRERR_BUFSIZE];
+
         switch (err) {
         case EPERM:
         case EACCES:
@@ -2072,8 +2074,9 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
         }
 
         return scnprintf(msg, size,
-        "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).  \n"
+        "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
         "/bin/dmesg may provide additional information.\n"
         "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
-                         err, strerror(err), perf_evsel__name(evsel));
+                         err, strerror_r(err, sbuf, sizeof(sbuf)),
+                         perf_evsel__name(evsel));
 }
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 1e15df10a88c..e34c81a0bcf3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -10,6 +10,7 @@
 #include "symbol.h"
 #include "cache.h"
 #include "header.h"
+#include "debug.h"
 #include <api/fs/debugfs.h>
 #include "parse-events-bison.h"
 #define YY_EXTRA_TYPE int
@@ -1006,9 +1007,11 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
         char evt_path[MAXPATHLEN];
         char dir_path[MAXPATHLEN];
+        char sbuf[STRERR_BUFSIZE];
 
         if (debugfs_valid_mountpoint(tracing_events_path)) {
-                printf("  [ Tracepoints not available: %s ]\n", strerror(errno));
+                printf("  [ Tracepoints not available: %s ]\n",
+                        strerror_r(errno, sbuf, sizeof(sbuf)));
                 return;
         }
 
diff --git a/tools/perf/util/run-command.c b/tools/perf/util/run-command.c
index da8e9b285f51..34622b53e733 100644
--- a/tools/perf/util/run-command.c
+++ b/tools/perf/util/run-command.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "run-command.h"
 #include "exec_cmd.h"
+#include "debug.h"
 
 static inline void close_pair(int fd[2])
 {
@@ -19,6 +20,7 @@ int start_command(struct child_process *cmd)
 {
         int need_in, need_out, need_err;
         int fdin[2], fdout[2], fderr[2];
+        char sbuf[STRERR_BUFSIZE];
 
         /*
          * In case of errors we must keep the promise to close FDs
@@ -99,7 +101,7 @@ int start_command(struct child_process *cmd)
 
                 if (cmd->dir && chdir(cmd->dir))
                         die("exec %s: cd to %s failed (%s)", cmd->argv[0],
-                            cmd->dir, strerror(errno));
+                            cmd->dir, strerror_r(errno, sbuf, sizeof(sbuf)));
                 if (cmd->env) {
                         for (; *cmd->env; cmd->env++) {
                                 if (strchr(*cmd->env, '='))
@@ -153,6 +155,8 @@ int start_command(struct child_process *cmd)
 
 static int wait_or_whine(pid_t pid)
 {
+        char sbuf[STRERR_BUFSIZE];
+
         for (;;) {
                 int status, code;
                 pid_t waiting = waitpid(pid, &status, 0);
@@ -160,7 +164,8 @@ static int wait_or_whine(pid_t pid)
                 if (waiting < 0) {
                         if (errno == EINTR)
                                 continue;
-                        error("waitpid failed (%s)", strerror(errno));
+                        error("waitpid failed (%s)",
+                              strerror_r(errno, sbuf, sizeof(sbuf)));
                         return -ERR_RUN_COMMAND_WAITPID;
                 }
                 if (waiting != pid)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 25822bdf7bbf..24e8d871b74e 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -456,6 +456,7 @@ 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];
 
         fd = open(filename, O_RDONLY);
         if (fd < 0)
@@ -476,8 +477,8 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep)
                 n = read(fd, bf + size, alloc_size - size);
                 if (n < 0) {
                         if (size) {
-                                pr_warning("read failed %d: %s\n",
-                                           errno, strerror(errno));
+                                pr_warning("read failed %d: %s\n", errno,
+                                         strerror_r(errno, sbuf, sizeof(sbuf)));
                                 err = 0;
                         } else
                                 err = -errno;