mirror of https://github.com/xzeldon/htop.git
120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/*
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htop - Compat.c
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(C) 2020 htop dev team
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Released under the GNU GPLv2, see the COPYING file
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in the source distribution for its full text.
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*/
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#include "config.h" // IWYU pragma: keep
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#include "Compat.h"
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#include <errno.h>
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#include <fcntl.h> // IWYU pragma: keep
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h> // IWYU pragma: keep
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#include "XUtils.h" // IWYU pragma: keep
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int Compat_faccessat(int dirfd,
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const char* pathname,
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int mode,
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int flags) {
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int ret;
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#ifdef HAVE_FACCESSAT
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// Implementation note: AT_SYMLINK_NOFOLLOW unsupported on FreeBSD, fallback to lstat in that case
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errno = 0;
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ret = faccessat(dirfd, pathname, mode, flags);
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if (!ret || errno != EINVAL)
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return ret;
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#endif
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// Error out on unsupported configurations
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if (dirfd != (int)AT_FDCWD || mode != F_OK) {
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errno = EINVAL;
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return -1;
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}
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// Fallback to stat(2)/lstat(2) depending on flags
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struct stat statinfo;
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if(flags) {
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ret = lstat(pathname, &statinfo);
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} else {
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ret = stat(pathname, &statinfo);
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}
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return ret;
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}
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int Compat_fstatat(int dirfd,
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const char* dirpath,
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const char* pathname,
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struct stat* statbuf,
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int flags) {
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#ifdef HAVE_FSTATAT
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(void)dirpath;
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return fstatat(dirfd, pathname, statbuf, flags);
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#else
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(void)dirfd;
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char path[4096];
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xSnprintf(path, sizeof(path), "%s/%s", dirpath, pathname);
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if (flags & AT_SYMLINK_NOFOLLOW)
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return lstat(path, statbuf);
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return stat(path, statbuf);
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#endif
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}
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#ifndef HAVE_OPENAT
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int Compat_openat(const char* dirpath,
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const char* pathname,
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int flags) {
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char path[4096];
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xSnprintf(path, sizeof(path), "%s/%s", dirpath, pathname);
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return open(path, flags);
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}
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#endif /* !HAVE_OPENAT */
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ssize_t Compat_readlinkat(int dirfd,
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const char* dirpath,
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const char* pathname,
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char* buf,
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size_t bufsize) {
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#ifdef HAVE_READLINKAT
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(void)dirpath;
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return readlinkat(dirfd, pathname, buf, bufsize);
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#else
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(void)dirfd;
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char path[4096];
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xSnprintf(path, sizeof(path), "%s/%s", dirpath, pathname);
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return readlink(path, buf, bufsize);
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#endif
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}
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