Demo-implementation of close_fds()

37952_apache-closefd.c (text/plain), 1.75 KB, created by Philipp Hahn on 2015-03-06 12:53:32 UTC

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Description: Demo-implementation of close_fds()

Filename:

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Creator: Philipp Hahn

Created: 2015-03-06 12:53:32 UTC

Size: 1.75 KB

patch

obsolete

>/* > * Close all open file descriptors. > */ >#include <stdlib.h> >#include <stdio.h> >#include <stddef.h> >#include <sys/types.h> >#include <sys/stat.h> >#include <unistd.h> >#include <dirent.h> >#include <errno.h> > >const char dirpath[] = "/proc/self/fd"; > >static void close_fds_linux() { > printf("close_fds_linux()\n"); > > DIR *dirp = opendir(dirpath); > if (!dirp) > perror("opendir()"); > > long name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX); > if (name_max == -1) /* Limit not defined, or error */ > name_max = 255; /* Take a guess */ > size_t len = offsetof(struct dirent, d_name) + name_max + 1; > > struct dirent *result, *entryp = malloc(len); > if (!entryp) > perror("malloc()"); > > for (;;) { > int ret = readdir_r(dirp, entryp, &result); > if (ret) > perror("readdir_r()"); > if (!result) > break; > switch (result->d_name[0]) { > case '0': /* STDIN */ > case '1': /* STDOUT */ > case '2': /* STDERR */ > if (result->d_name[1] != '\0') > break; > /* fall-through */ > case '.': > continue; > } > int fd = atoi(result->d_name); > if (fd == dirfd(dirp)) > continue; > printf("Closing %d...\n", fd); > ret = close(fd); > if (ret) > perror("close()"); > } > > free(entryp); > > int ret = closedir(dirp); > if (ret) > perror("closedir()"); >} > >static void close_fds_generic() { > printf("close_fds_generic()\n"); > > int fd = sysconf(_SC_OPEN_MAX); > if (fd < 0) > perror("sysconf()"); > while (fd > STDERR_FILENO) { > printf("Closing %d...\n", fd); > int ret = close(fd--); > if (ret && errno != EBADF) > perror("close()"); > } >} > >static void close_fds() { > struct stat buf; > int ret = stat(dirpath, &buf); > if (!ret && S_ISDIR(buf.st_mode)) > close_fds_linux(); > else if (ret && errno == ENOENT) > close_fds_generic(); > else > perror("stat()"); >} > >int main(void) { > close_fds(); > return 0; >} View Attachment As Raw

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