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path: root/src/misc/realpath.c
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2018-09-12move and deduplicate declarations of __procfdname to make it checkableRich Felker1-2/+0
syscall.h was chosen as the header to declare it, since its intended usage is alongside syscalls as a fallback for operations the direct syscall does not support.
2014-05-24support kernels with no SYS_open syscall, only SYS_openatRich Felker1-1/+1
open is handled specially because it is used from so many places, in so many variants (2 or 3 arguments, setting errno or not, and cancellable or not). trying to do it as a function would not only increase bloat, but would also risk subtle breakage. this is the first step towards supporting "new" archs where linux lacks "old" syscalls.
2013-08-31remove incorrect cancellation points from realpathRich Felker1-4/+4
2013-08-31debloat realpath's allocation strategyRich Felker1-12/+6
rather than allocating a PATH_MAX-sized buffer when the caller does not provide an output buffer, work first with a PATH_MAX-sized temp buffer with automatic storage, and either copy it to the caller's buffer or strdup it on success. this not only avoids massive memory waste, but also avoids pulling in free (and thus the full malloc implementation) unnecessarily in static programs.
2013-08-31make realpath use O_PATH when opening the fileRich Felker1-1/+1
this avoids failure if the file is not readable and avoids odd behavior for device nodes, etc. on old kernels that lack O_PATH, the old behavior (O_RDONLY) will naturally happen as the fallback.
2013-08-02debloat code that depends on /proc/self/fd/%d with shared functionRich Felker1-1/+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.
2012-09-29fix some more O_CLOEXEC/SOCK_CLOEXEC issuesRich Felker1-1/+1
2012-09-06use restrict everywhere it's required by c99 and/or posix 2008Rich Felker1-1/+1
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.
2011-06-18fix memory leak on failure in realpathRich Felker1-4/+4
2011-04-17minimal realpath implementation using /procRich Felker1-0/+43
clean and simple, but fails when the caller does not have permissions to open the file for reading or when /proc is not available. i may replace this with a full implementation later, possibly leaving this version as an optimization to use when it works.
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker1-0/+6