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| author | Quentin Monnet <quentin.monnet@netronome.com> | 2018-11-30 17:25:44 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-11-30 23:06:06 +0100 |
| commit | 327e5dab6dd8559ba28739ec8873350d7b5bb080 (patch) | |
| tree | 370cef3a25e60fa348730d04ee1561b7f726d705 /tools | |
| parent | arm64/bpf: use movn/movk/movk sequence to generate kernel addresses (diff) | |
| download | linux-327e5dab6dd8559ba28739ec8873350d7b5bb080.tar.xz linux-327e5dab6dd8559ba28739ec8873350d7b5bb080.zip | |
tools: bpftool: use "/proc/self/" i.o. crafting links with getpid()
The getpid() function is called in a couple of places in bpftool to
craft links of the shape "/proc/<pid>/...". Instead, it is possible to
use the "/proc/self/" shortcut, which makes things a bit easier, in
particular in jit_disasm.c.
Do the replacement, and remove the includes of <sys/types.h> from the
relevant files, now we do not use getpid() anymore.
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/bpf/bpftool/common.c | 5 | ||||
| -rw-r--r-- | tools/bpf/bpftool/jit_disasm.c | 11 |
2 files changed, 3 insertions, 13 deletions
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index 4e217d57118e..4349b6683ca8 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -48,7 +48,6 @@ #include <sys/mount.h> #include <sys/resource.h> #include <sys/stat.h> -#include <sys/types.h> #include <sys/vfs.h> #include <bpf.h> @@ -276,7 +275,7 @@ int get_fd_type(int fd) char buf[512]; ssize_t n; - snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd); + snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); n = readlink(path, buf, sizeof(buf)); if (n < 0) { @@ -304,7 +303,7 @@ char *get_fdinfo(int fd, const char *key) ssize_t n; FILE *fdi; - snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd); + snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); fdi = fopen(path, "r"); if (!fdi) { diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c index b2ed5ee1af5f..545a92471c33 100644 --- a/tools/bpf/bpftool/jit_disasm.c +++ b/tools/bpf/bpftool/jit_disasm.c @@ -19,7 +19,6 @@ #include <string.h> #include <bfd.h> #include <dis-asm.h> -#include <sys/types.h> #include <sys/stat.h> #include <limits.h> @@ -28,20 +27,12 @@ static void get_exec_path(char *tpath, size_t size) { + const char *path = "/proc/self/exe"; ssize_t len; - char *path; - - snprintf(tpath, size, "/proc/%d/exe", (int) getpid()); - tpath[size - 1] = 0; - - path = strdup(tpath); - assert(path); len = readlink(path, tpath, size - 1); assert(len > 0); tpath[len] = 0; - - free(path); } static int oper_count; |