a75700d86e
The util-linux close_all_fds() serves the same purpose as close_range() that will over time obsolete local implementation completely. For upcoming few years it is best to have a fallback that uses same input arguments as the new system call. That allows surrounding code and variables not to be affected by version of mass file descriptor closing function. Proposed-by: Karel Zak <kzak@redhat.com> Reference: https://github.com/karelzak/util-linux/pull/1205#discussion_r534080128 Signed-off-by: Sami Kerola <kerolasa@iki.fi>
97 lines
2 KiB
C
97 lines
2 KiB
C
#ifndef UTIL_LINUX_FILEUTILS
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#define UTIL_LINUX_FILEUTILS
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include "c.h"
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extern int mkstemp_cloexec(char *template);
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extern int xmkstemp(char **tmpname, const char *dir, const char *prefix);
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static inline FILE *xfmkstemp(char **tmpname, const char *dir, const char *prefix)
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{
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int fd;
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FILE *ret;
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fd = xmkstemp(tmpname, dir, prefix);
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if (fd == -1)
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return NULL;
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if (!(ret = fdopen(fd, "w+" UL_CLOEXECSTR))) {
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close(fd);
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return NULL;
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}
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return ret;
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}
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#ifdef HAVE_OPENAT
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static inline FILE *fopen_at(int dir, const char *filename,
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int flags, const char *mode)
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{
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int fd = openat(dir, filename, flags);
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if (fd < 0)
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return NULL;
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return fdopen(fd, mode);
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}
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#endif
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static inline int is_same_inode(const int fd, const struct stat *st)
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{
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struct stat f;
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if (fstat(fd, &f) < 0)
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return 0;
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else if (f.st_dev != st->st_dev || f.st_ino != st->st_ino)
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return 0;
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return 1;
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}
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extern int dup_fd_cloexec(int oldfd, int lowfd);
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extern unsigned int get_fd_tabsize(void);
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extern int mkdir_p(const char *path, mode_t mode);
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extern char *stripoff_last_component(char *path);
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/* This is readdir()-like function, but skips "." and ".." directory entries */
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static inline struct dirent *xreaddir(DIR *dp)
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{
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struct dirent *d;
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while ((d = readdir(dp))) {
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if (!strcmp(d->d_name, ".") ||
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!strcmp(d->d_name, ".."))
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continue;
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break;
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}
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return d;
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}
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#if defined(__linux__)
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# include <sys/syscall.h>
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# if defined(SYS_close_range)
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# include <sys/types.h>
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# ifndef HAVE_CLOSE_RANGE
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static inline int close_range(unsigned int first, unsigned int last)
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{
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return syscall(SYS_close_range, first, last);
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}
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# endif
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# define HAVE_CLOSE_RANGE 1
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# endif /* SYS_close_range */
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#endif /* __linux__ */
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#ifndef HAVE_CLOSE_RANGE
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extern void close_all_fds(unsigned int first, unsigned int last);
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#endif
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#define UL_COPY_READ_ERROR (-1)
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#define UL_COPY_WRITE_ERROR (-2)
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int ul_copy_file(int from, int to);
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#endif /* UTIL_LINUX_FILEUTILS */
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