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tools lib api fs: Adopt filename__read_str from perf

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We already moved similar functions in here, also it'll be useful for
sysfs__read_str addition in following patch.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1455465826-8426-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-02-14 17:03:43 +01:00 • committed by Arnaldo Carvalho de Melo
parent 975f14fa8f
commit 607bfbd7ff
5 changed files with 54 additions and 49 deletions
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51
tools/lib/api/fs/fs.c
View file

@ -13,6 +13,7 @@
#include <sys/mount.h>
#include "fs.h"
#include "debug-internal.h"
#define _STR(x) #x
#define STR(x) _STR(x)
@ -300,6 +301,56 @@ int filename__read_ull(const char *filename, unsigned long long *value)
return err;
}
#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];
fd = open(filename, O_RDONLY);
if (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_warning("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;
} else
free(bf);
close(fd);
return err;
}
int sysfs__read_ull(const char *entry, unsigned long long *value)
{
char path[PATH_MAX];