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* make fchdir, fchmod, fchown, and fstat support O_PATH file descriptorsRich Felker2013-08-022-3/+19
| | | | | | | | | 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.
* debloat code that depends on /proc/self/fd/%d with shared functionRich Felker2013-08-021-1/+3
| | | | | | | I intend to add more Linux workarounds that depend on using these pathnames, and some of them will be in "syscall" functions that, from an anti-bloat standpoint, should not depend on the whole snprintf framework.
* work around linux's lack of flags argument to fchmodat syscallRich Felker2013-08-021-1/+29
| | | | | | | | | | | | | | | | | | | previously, the AT_SYMLINK_NOFOLLOW flag was ignored, giving dangerously incorrect behavior -- the target of the symlink had its modes changed to the modes (usually 0777) intended for the symlink). this issue was amplified by the fact that musl provides lchmod, as a wrapper for fchmodat, which some archival programs take as a sign that symlink modes are supported and thus attempt to use. emulating AT_SYMLINK_NOFOLLOW was a difficult problem, and I originally believed it could not be solved, at least not without depending on kernels newer than 3.5.x or so where O_PATH works halfway well. however, it turns out that accessing O_PATH file descriptors via their pseudo-symlink entries in /proc/self/fd works much better than trying to use the fd directly, and works even on older kernels. moreover, the kernel has permanently pegged these references to the inode obtained by the O_PATH open, so there should not be race conditions with the file being moved, deleted, replaced, etc.
* improve [f]stat[v]fs functions, and possibly work around old kernelsRich Felker2013-07-191-2/+5
| | | | | | | | | | | | | | | | | the main aim of this patch is to ensure that if not all fields are filled in, they contain zeros, so as not to confuse applications. reportedly some older kernels, including commonly used openvz kernels, lack the f_flags field, resulting in applications reading random junk as the mount flags; the common symptom seems to be wrongly considering the filesystem to be mounted read-only and refusing to operate. glibc has some amazingly ugly fallback code to get the mount flags for old kernels, but having them really is not that important anyway; what matters most is not presenting incorrect flags to the application. I have also aimed to fill in some fields of statvfs that were previously missing, and added code to explicitly zero the reserved space at the end of the structure, which will make things easier in the future if this space someday needs to be used.
* fix mknod and mknodat to accept large dev_t valuesRich Felker2013-05-162-5/+2
| | | | | | | | support for these was recently added to sysmacros.h. note that the syscall argument is a long, despite dev_t being 64-bit, so on 32-bit archs the high bits will be lost. it appears the high bits are just glibc silliness and not part of the kernel api, anyway, but it's nice that we have them there for future expansion if needed.
* add obsolete futimesat()rofl0r2012-12-061-0/+9
| | | | | | this function is obsolete, however it's available as a syscall and as such qemu userspace emulation tries to forward it to the host kernel.
* use restrict everywhere it's required by c99 and/or posix 2008Rich Felker2012-09-064-4/+4
| | | | | | | | to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
* add LSB ABI __xstat, etc. junkRich Felker2012-05-314-0/+36
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* fix statvfs.c to match new fsid_t definitionRich Felker2011-09-201-1/+1
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* fix the definition of struct statvfs to match lsb abiRich Felker2011-09-192-19/+46
| | | | | at the same time, make struct statfs match the traditional definition and make it more useful, especially the fsid_t stuff.
* fix (hopefully) statvfs breakage on x86_64 that resulted from fixing i386...Rich Felker2011-04-052-2/+10
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* fix statvfs syscalls (missing size argument)Rich Felker2011-04-032-2/+2
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* global cleanup to use the new syscall interfaceRich Felker2011-03-2015-15/+15
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* implement futimens and utimensatRich Felker2011-02-272-0/+13
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* add portable lchown (trivial to support and a few ancient things want it..)Rich Felker2011-02-171-0/+7
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* finish moving 32-bit-specific junk out of source files.Rich Felker2011-02-156-6/+6
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* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-1216-0/+137