musl - musl - an implementation of the standard library for Linux-based systems

musl - an implementation of the standard library for Linux-based systems

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author	Rich Felker <dalias@aerifal.cx>	2013年08月02日 13:33:31 -0400
committer	Rich Felker <dalias@aerifal.cx>	2013年08月02日 13:33:31 -0400
commit	9ca1f62b0c0d3e50480eb654ac941ff943ce0558 (patch)
tree	3920a0d5db41c52b13b8a70efdb2c039aa4e4f9c /src/stat/fchmod.c
parent	c8c0844f7fbcb955848ca84432e5ffcf71f1cef1 (diff)
download	musl-9ca1f62b0c0d3e50480eb654ac941ff943ce0558.tar.gz

make fchdir, fchmod, fchown, and fstat support O_PATH file descriptors

on newer kernels, fchdir and fstat work anyway. this same fix should be applied to any other syscalls that are similarly affected. with this change, the current definitions of O_SEARCH and O_EXEC as O_PATH are mostly conforming to POSIX requirements. the main remaining issue is that O_NOFOLLOW has different semantics.

Diffstat (limited to 'src/stat/fchmod.c')

-rw-r--r--

src/stat/fchmod.c

1 files changed, 9 insertions, 1 deletions

diff --git a/src/stat/fchmod.c b/src/stat/fchmod.c
index f9b99366..1b943d44 100644
--- a/src/stat/fchmod.c
+++ b/src/stat/fchmod.c

@@ -1,7 +1,15 @@

#include <sys/stat.h>

+#include <errno.h>

#include "syscall.h"

+void __procfdname(char *, unsigned);

int fchmod(int fd, mode_t mode)

{

- return syscall(SYS_fchmod, fd, mode);

+ int ret = __syscall(SYS_fchmod, fd, mode);

+ if (ret != -EBADF || fd < 0) return __syscall_ret(ret);

+ char buf[15+3*sizeof(int)];

+ __procfdname(buf, fd);

+ return syscall(SYS_chmod, buf, mode);

}

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