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tools: Introduce str_error_r()

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The tools so far have been using the strerror_r() GNU variant, that
returns a string, be it the buffer passed or something else.

But that, besides being tricky in cases where we expect that the
function using strerror_r() returns the error formatted in a provided
buffer (we have to check if it returned something else and copy that
instead), breaks the build on systems not using glibc, like Alpine
Linux, where musl libc is used.

So, introduce yet another wrapper, str_error_r(), that has the GNU
interface, but uses the portable XSI variant of strerror_r(), so that
users rest asured that the provided buffer is used and it is what is
returned.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-d4t42fnf48ytlk8rjxs822tf@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2016-07-06 11:56:20 -03:00
parent ffe3a28a8b
commit c8b5f2c96d
41 changed files with 113 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
tools/perf/util/Build
View File

@@ -70,6 +70,7 @@ libperf-y += stat.o
libperf-y += stat-shadow.o
libperf-y += record.o
libperf-y += srcline.o
libperf-y += str_error_r.o
libperf-y += data.o
libperf-y += tsc.o
libperf-y += cloexec.o
@@ -173,6 +174,10 @@ $(OUTPUT)util/libstring.o: ../lib/string.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
$(OUTPUT)util/str_error_r.o: ../lib/str_error_r.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
$(OUTPUT)util/hweight.o: ../lib/hweight.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)

2
tools/perf/util/bpf-loader.c
View File

@@ -1589,7 +1589,7 @@ bpf_loader_strerror(int err, char *buf, size_t size)
snprintf(buf, size, "Unknown bpf loader error %d", err);
else
snprintf(buf, size, "%s",
strerror_r(err, sbuf, sizeof(sbuf)));
str_error_r(err, sbuf, sizeof(sbuf)));
buf[size - 1] = '\0';
return -1;

4
tools/perf/util/cloexec.c
View File

@@ -58,7 +58,7 @@ 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_r(err, sbuf, sizeof(sbuf)));
err, str_error_r(err, sbuf, sizeof(sbuf)));
/* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
while (1) {
@@ -76,7 +76,7 @@ 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_r(err, sbuf, sizeof(sbuf))))
err, str_error_r(err, sbuf, sizeof(sbuf))))
return -1;
return 0;

4
tools/perf/util/data.c
View File

@@ -57,7 +57,7 @@ static int open_file_read(struct perf_data_file *file)
int err = errno;
pr_err("failed to open %s: %s", file->path,
strerror_r(err, sbuf, sizeof(sbuf)));
str_error_r(err, sbuf, sizeof(sbuf)));
if (err == ENOENT && !strcmp(file->path, "perf.data"))
pr_err(" (try 'perf record' first)");
pr_err("\n");
@@ -99,7 +99,7 @@ static int open_file_write(struct perf_data_file *file)
if (fd < 0)
pr_err("failed to open %s : %s\n", file->path,
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
return fd;
}

2
tools/perf/util/debug.h
View File

@@ -38,7 +38,7 @@ extern int debug_data_convert;
#define pr_oe_time(t, fmt, ...) pr_time_N(1, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_oe_time2(t, fmt, ...) pr_time_N(2, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
#define STRERR_BUFSIZE 128 /* For the buffer size of strerror_r */
#define STRERR_BUFSIZE 128 /* For the buffer size of str_error_r */
int dump_printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
void trace_event(union perf_event *event);

6
tools/perf/util/dso.c
View File

@@ -335,7 +335,7 @@ static int do_open(char *name)
return fd;
pr_debug("dso open failed: %s\n",
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
if (!dso__data_open_cnt || errno != EMFILE)
break;
@@ -786,7 +786,7 @@ static int data_file_size(struct dso *dso, struct machine *machine)
if (fstat(dso->data.fd, &st) < 0) {
ret = -errno;
pr_err("dso cache fstat failed: %s\n",
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
dso->data.status = DSO_DATA_STATUS_ERROR;
goto out;
}
@@ -1366,7 +1366,7 @@ int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
BUG_ON(buflen == 0);
if (errnum >= 0) {
const char *err = strerror_r(errnum, buf, buflen);
const char *err = str_error_r(errnum, buf, buflen);
if (err != buf)
scnprintf(buf, buflen, "%s", err);

4
tools/perf/util/evlist.c
View File

@@ -1790,7 +1790,7 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist,
int err, char *buf, size_t size)
{
int printed, value;
char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
switch (err) {
case EACCES:
@@ -1842,7 +1842,7 @@ out_default:
int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
{
char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
switch (err) {

2
tools/perf/util/evsel.c
View File

@@ -2419,7 +2419,7 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
"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?",
err, strerror_r(err, sbuf, sizeof(sbuf)),
err, str_error_r(err, sbuf, sizeof(sbuf)),
perf_evsel__name(evsel));
}

8
tools/perf/util/llvm-utils.c
View File

@@ -106,7 +106,7 @@ read_from_pipe(const char *cmd, void **p_buf, size_t *p_read_sz)
file = popen(cmd, "r");
if (!file) {
pr_err("ERROR: unable to popen cmd: %s\n",
strerror_r(errno, serr, sizeof(serr)));
str_error_r(errno, serr, sizeof(serr)));
return -EINVAL;
}
@@ -140,7 +140,7 @@ read_from_pipe(const char *cmd, void **p_buf, size_t *p_read_sz)
if (ferror(file)) {
pr_err("ERROR: error occurred when reading from pipe: %s\n",
strerror_r(errno, serr, sizeof(serr)));
str_error_r(errno, serr, sizeof(serr)));
err = -EIO;
goto errout;
}
@@ -382,7 +382,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
if (path[0] != '-' && realpath(path, abspath) == NULL) {
err = errno;
pr_err("ERROR: problems with path %s: %s\n",
path, strerror_r(err, serr, sizeof(serr)));
path, str_error_r(err, serr, sizeof(serr)));
return -err;
}
@@ -410,7 +410,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
if (nr_cpus_avail <= 0) {
pr_err(
"WARNING:\tunable to get available CPUs in this system: %s\n"
" \tUse 128 instead.\n", strerror_r(errno, serr, sizeof(serr)));
" \tUse 128 instead.\n", str_error_r(errno, serr, sizeof(serr)));
nr_cpus_avail = 128;
}
snprintf(nr_cpus_avail_str, sizeof(nr_cpus_avail_str), "%d",

6
tools/perf/util/probe-event.c
View File

@@ -468,7 +468,7 @@ static struct debuginfo *open_debuginfo(const char *module, bool silent)
err = kernel_get_module_dso(module, &dso);
if (err < 0) {
if (!dso || dso->load_errno == 0) {
if (!strerror_r(-err, reason, STRERR_BUFSIZE))
if (!str_error_r(-err, reason, STRERR_BUFSIZE))
strcpy(reason, "(unknown)");
} else
dso__strerror_load(dso, reason, STRERR_BUFSIZE);
@@ -806,7 +806,7 @@ static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
error:
if (ferror(fp)) {
pr_warning("File read error: %s\n",
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
return -1;
}
return 0;
@@ -886,7 +886,7 @@ static int __show_line_range(struct line_range *lr, const char *module,
fp = fopen(lr->path, "r");
if (fp == NULL) {
pr_warning("Failed to open %s: %s\n", lr->path,
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
return -errno;
}
/* Skip to starting line number */

10
tools/perf/util/probe-file.c
View File

@@ -50,7 +50,7 @@ static void print_open_warning(int err, bool uprobe)
else
pr_warning("Failed to open %cprobe_events: %s\n",
uprobe ? 'u' : 'k',
strerror_r(-err, sbuf, sizeof(sbuf)));
str_error_r(-err, sbuf, sizeof(sbuf)));
}
static void print_both_open_warning(int kerr, int uerr)
@@ -64,9 +64,9 @@ static void print_both_open_warning(int kerr, int uerr)
else {
char sbuf[STRERR_BUFSIZE];
pr_warning("Failed to open kprobe events: %s.\n",
strerror_r(-kerr, sbuf, sizeof(sbuf)));
str_error_r(-kerr, sbuf, sizeof(sbuf)));
pr_warning("Failed to open uprobe events: %s.\n",
strerror_r(-uerr, sbuf, sizeof(sbuf)));
str_error_r(-uerr, sbuf, sizeof(sbuf)));
}
}
@@ -224,7 +224,7 @@ int probe_file__add_event(int fd, struct probe_trace_event *tev)
if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) {
ret = -errno;
pr_warning("Failed to write event: %s\n",
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
}
}
free(buf);
@@ -262,7 +262,7 @@ static int __del_trace_probe_event(int fd, struct str_node *ent)
return 0;
error:
pr_warning("Failed to delete event: %s\n",
strerror_r(-ret, buf, sizeof(buf)));
str_error_r(-ret, buf, sizeof(buf)));
return ret;
}

4
tools/perf/util/probe-finder.c
View File

@@ -381,7 +381,7 @@ formatted:
if (ret >= 16)
ret = -E2BIG;
pr_warning("Failed to convert variable type: %s\n",
strerror_r(-ret, sbuf, sizeof(sbuf)));
str_error_r(-ret, sbuf, sizeof(sbuf)));
return ret;
}
tvar->type = strdup(buf);
@@ -809,7 +809,7 @@ static int find_lazy_match_lines(struct intlist *list,
fp = fopen(fname, "r");
if (!fp) {
pr_warning("Failed to open %s: %s\n", fname,
strerror_r(errno, sbuf, sizeof(sbuf)));
str_error_r(errno, sbuf, sizeof(sbuf)));
return -errno;
}

1
tools/perf/util/python-ext-sources
View File

@@ -13,6 +13,7 @@ util/cpumap.c
../lib/bitmap.c
../lib/find_bit.c
../lib/hweight.c
../lib/str_error_r.c
util/thread_map.c
util/util.c
util/xyarray.c

2
tools/perf/util/target.c
View File

@@ -121,7 +121,7 @@ int target__strerror(struct target *target, int errnum,
BUG_ON(buflen == 0);
if (errnum >= 0) {
const char *err = strerror_r(errnum, buf, buflen);
const char *err = str_error_r(errnum, buf, buflen);
if (err != buf)
scnprintf(buf, buflen, "%s", err);

1
tools/perf/util/util.h
View File

@@ -360,4 +360,5 @@ typedef void (*print_binary_t)(enum binary_printer_ops,
void print_binary(unsigned char *data, size_t len,
size_t bytes_per_line, print_binary_t printer,
void *extra);
#endif /* GIT_COMPAT_UTIL_H */