From 9cd65655585523adecd65b750e1537cdea84718e Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Tue, 10 Apr 2018 16:31:45 -0700 Subject: [PATCH] proc: test /proc/self/wchan This patch starts testing /proc. Many more tests to come (I promise). Read from /proc/self/wchan should always return "0" as current is in TASK_RUNNING state while reading /proc/self/wchan. Link: http://lkml.kernel.org/r/20180226212006.GA742@avx2 Signed-off-by: Alexey Dobriyan Cc: Shuah Khan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/proc/.gitignore | 1 + tools/testing/selftests/proc/Makefile | 6 +++++ tools/testing/selftests/proc/config | 1 + .../testing/selftests/proc/proc-self-wchan.c | 25 +++++++++++++++++++ 5 files changed, 34 insertions(+) create mode 100644 tools/testing/selftests/proc/.gitignore create mode 100644 tools/testing/selftests/proc/Makefile create mode 100644 tools/testing/selftests/proc/config create mode 100644 tools/testing/selftests/proc/proc-self-wchan.c diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 2fc410bc4f33..32aafa92074c 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -25,6 +25,7 @@ TARGETS += mqueue TARGETS += net TARGETS += nsfs TARGETS += powerpc +TARGETS += proc TARGETS += pstore TARGETS += ptrace TARGETS += seccomp diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore new file mode 100644 index 000000000000..4c851db80bd5 --- /dev/null +++ b/tools/testing/selftests/proc/.gitignore @@ -0,0 +1 @@ +/proc-self-wchan diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile new file mode 100644 index 000000000000..592603a5d675 --- /dev/null +++ b/tools/testing/selftests/proc/Makefile @@ -0,0 +1,6 @@ +CFLAGS += -Wall -O2 + +TEST_GEN_PROGS := +TEST_GEN_PROGS += proc-self-wchan + +include ../lib.mk diff --git a/tools/testing/selftests/proc/config b/tools/testing/selftests/proc/config new file mode 100644 index 000000000000..68fbd2b35884 --- /dev/null +++ b/tools/testing/selftests/proc/config @@ -0,0 +1 @@ +CONFIG_PROC_FS=y diff --git a/tools/testing/selftests/proc/proc-self-wchan.c b/tools/testing/selftests/proc/proc-self-wchan.c new file mode 100644 index 000000000000..b8d8728a6869 --- /dev/null +++ b/tools/testing/selftests/proc/proc-self-wchan.c @@ -0,0 +1,25 @@ +#include +#include +#include +#include +#include + +int main(void) +{ + char buf[64]; + int fd; + + fd = open("/proc/self/wchan", O_RDONLY); + if (fd == -1) { + if (errno == ENOENT) + return 2; + return 1; + } + + buf[0] = '\0'; + if (read(fd, buf, sizeof(buf)) != 1) + return 1; + if (buf[0] != '0') + return 1; + return 0; +}