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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2018-04-10 16:31:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:34 -0700 |
| commit | c4219edf1de2af44fd98903f72f6e1ceb7f3c701 (patch) | |
| tree | bc998b5b7696df378254d6fe62f274c1884c58b5 /tools | |
| parent | 9cd65655585523adecd65b750e1537cdea84718e (diff) | |
| download | lwn-c4219edf1de2af44fd98903f72f6e1ceb7f3c701.tar.gz lwn-c4219edf1de2af44fd98903f72f6e1ceb7f3c701.zip | |
proc: test /proc/self/syscall
Read from /proc/self/syscall should yield read system call and correct
args in the output as current is reading /proc/self/syscall.
Link: http://lkml.kernel.org/r/20180226212145.GB742@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/proc/.gitignore | 3 | ||||
| -rw-r--r-- | tools/testing/selftests/proc/Makefile | 1 | ||||
| -rw-r--r-- | tools/testing/selftests/proc/proc-self-syscall.c | 45 |
3 files changed, 48 insertions, 1 deletions
diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore index 4c851db80bd5..c648b27af2e7 100644 --- a/tools/testing/selftests/proc/.gitignore +++ b/tools/testing/selftests/proc/.gitignore @@ -1 +1,2 @@ -/proc-self-wchan +/proc-self-mem +/proc-self-syscall diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile index 592603a5d675..ad20520910e2 100644 --- a/tools/testing/selftests/proc/Makefile +++ b/tools/testing/selftests/proc/Makefile @@ -1,6 +1,7 @@ CFLAGS += -Wall -O2 TEST_GEN_PROGS := +TEST_GEN_PROGS += proc-self-syscall TEST_GEN_PROGS += proc-self-wchan include ../lib.mk diff --git a/tools/testing/selftests/proc/proc-self-syscall.c b/tools/testing/selftests/proc/proc-self-syscall.c new file mode 100644 index 000000000000..05eb6f91f1e9 --- /dev/null +++ b/tools/testing/selftests/proc/proc-self-syscall.c @@ -0,0 +1,45 @@ +#define _GNU_SOURCE +#include <unistd.h> +#include <sys/syscall.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#include <unistd.h> +#include <string.h> +#include <stdio.h> + +static inline ssize_t sys_read(int fd, void *buf, size_t len) +{ + return syscall(SYS_read, fd, buf, len); +} + +int main(void) +{ + char buf1[64]; + char buf2[64]; + int fd; + ssize_t rv; + + fd = open("/proc/self/syscall", O_RDONLY); + if (fd == -1) { + if (errno == ENOENT) + return 2; + return 1; + } + + /* Do direct system call as libc can wrap anything. */ + snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx", + (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2)); + + memset(buf2, 0, sizeof(buf2)); + rv = sys_read(fd, buf2, sizeof(buf2)); + if (rv < 0) + return 1; + if (rv < strlen(buf1)) + return 1; + if (strncmp(buf1, buf2, strlen(buf1)) != 0) + return 1; + + return 0; +} |