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tools/nolibc: add support for openat(2)

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openat is useful to avoid needing to construct relative paths, so expose
a wrapper for using it directly.

Signed-off-by: Louis Taylor <louis@kragniz.eu>
Link: https://lore.kernel.org/r/20250306184147.208723-1-louis@kragniz.eu
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Louis Taylor 2025-03-06 18:41:18 +00:00 committed by Thomas Weißschuh
parent cb839e0cc8
commit b2edaad7f5
2 changed files with 42 additions and 0 deletions
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25
tools/include/nolibc/sys.h
View File

@ -765,6 +765,31 @@ int mount(const char *src, const char *tgt,
return __sysret(sys_mount(src, tgt, fst, flags, data));
}
/*
* int openat(int dirfd, const char *path, int flags[, mode_t mode]);
*/
static __attribute__((unused))
int sys_openat(int dirfd, const char *path, int flags, mode_t mode)
{
return my_syscall4(__NR_openat, dirfd, path, flags, mode);
}
static __attribute__((unused))
int openat(int dirfd, const char *path, int flags, ...)
{
mode_t mode = 0;
if (flags & O_CREAT) {
va_list args;
va_start(args, flags);
mode = va_arg(args, mode_t);
va_end(args);
}
return __sysret(sys_openat(dirfd, path, flags, mode));
}
/*
* int open(const char *path, int flags[, mode_t mode]);

17
tools/testing/selftests/nolibc/nolibc-test.c
View File

@ -1028,6 +1028,22 @@ int test_rlimit(void)
return 0;
}
int test_openat(void)
{
int dev, null;
dev = openat(AT_FDCWD, "/dev", O_DIRECTORY);
if (dev < 0)
return -1;
null = openat(dev, "null", O_RDONLY);
close(dev);
if (null < 0)
return -1;
close(null);
return 0;
}
/* Run syscall tests between IDs <min> and <max>.
* Return 0 on success, non-zero on failure.
@ -1116,6 +1132,7 @@ int run_syscall(int min, int max)
CASE_TEST(mmap_munmap_good); EXPECT_SYSZR(1, test_mmap_munmap()); break;
CASE_TEST(open_tty); EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
CASE_TEST(open_blah); EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
CASE_TEST(openat_dir); EXPECT_SYSZR(1, test_openat()); break;
CASE_TEST(pipe); EXPECT_SYSZR(1, test_pipe()); break;
CASE_TEST(poll_null); EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
CASE_TEST(poll_stdout); EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;