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-rw-r--r--src/basic/fileio.c1398
1 files changed, 0 insertions, 1398 deletions
diff --git a/src/basic/fileio.c b/src/basic/fileio.c
deleted file mode 100644
index f183de4999..0000000000
--- a/src/basic/fileio.c
+++ /dev/null
@@ -1,1398 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "alloc-util.h"
-#include "ctype.h"
-#include "escape.h"
-#include "fd-util.h"
-#include "fileio.h"
-#include "fs-util.h"
-#include "hexdecoct.h"
-#include "log.h"
-#include "macro.h"
-#include "parse-util.h"
-#include "path-util.h"
-#include "random-util.h"
-#include "stdio-util.h"
-#include "string-util.h"
-#include "strv.h"
-#include "time-util.h"
-#include "umask-util.h"
-#include "utf8.h"
-
-int write_string_stream(FILE *f, const char *line, bool enforce_newline) {
-
- assert(f);
- assert(line);
-
- fputs(line, f);
- if (enforce_newline && !endswith(line, "\n"))
- fputc('\n', f);
-
- return fflush_and_check(f);
-}
-
-static int write_string_file_atomic(const char *fn, const char *line, bool enforce_newline) {
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ char *p = NULL;
- int r;
-
- assert(fn);
- assert(line);
-
- r = fopen_temporary(fn, &f, &p);
- if (r < 0)
- return r;
-
- (void) fchmod_umask(fileno(f), 0644);
-
- r = write_string_stream(f, line, enforce_newline);
- if (r >= 0) {
- if (rename(p, fn) < 0)
- r = -errno;
- }
-
- if (r < 0)
- (void) unlink(p);
-
- return r;
-}
-
-int write_string_file(const char *fn, const char *line, WriteStringFileFlags flags) {
- _cleanup_fclose_ FILE *f = NULL;
- int q, r;
-
- assert(fn);
- assert(line);
-
- if (flags & WRITE_STRING_FILE_ATOMIC) {
- assert(flags & WRITE_STRING_FILE_CREATE);
-
- r = write_string_file_atomic(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
- if (r < 0)
- goto fail;
-
- return r;
- }
-
- if (flags & WRITE_STRING_FILE_CREATE) {
- f = fopen(fn, "we");
- if (!f) {
- r = -errno;
- goto fail;
- }
- } else {
- int fd;
-
- /* We manually build our own version of fopen(..., "we") that
- * works without O_CREAT */
- fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0) {
- r = -errno;
- goto fail;
- }
-
- f = fdopen(fd, "we");
- if (!f) {
- r = -errno;
- safe_close(fd);
- goto fail;
- }
- }
-
- r = write_string_stream(f, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
- if (r < 0)
- goto fail;
-
- return 0;
-
-fail:
- if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
- return r;
-
- f = safe_fclose(f);
-
- /* OK, the operation failed, but let's see if the right
- * contents in place already. If so, eat up the error. */
-
- q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
- if (q <= 0)
- return r;
-
- return 0;
-}
-
-int read_one_line_file(const char *fn, char **line) {
- _cleanup_fclose_ FILE *f = NULL;
- char t[LINE_MAX], *c;
-
- assert(fn);
- assert(line);
-
- f = fopen(fn, "re");
- if (!f)
- return -errno;
-
- if (!fgets(t, sizeof(t), f)) {
-
- if (ferror(f))
- return errno > 0 ? -errno : -EIO;
-
- t[0] = 0;
- }
-
- c = strdup(t);
- if (!c)
- return -ENOMEM;
- truncate_nl(c);
-
- *line = c;
- return 0;
-}
-
-int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ char *buf = NULL;
- size_t l, k;
-
- assert(fn);
- assert(blob);
-
- l = strlen(blob);
-
- if (accept_extra_nl && endswith(blob, "\n"))
- accept_extra_nl = false;
-
- buf = malloc(l + accept_extra_nl + 1);
- if (!buf)
- return -ENOMEM;
-
- f = fopen(fn, "re");
- if (!f)
- return -errno;
-
- /* We try to read one byte more than we need, so that we know whether we hit eof */
- errno = 0;
- k = fread(buf, 1, l + accept_extra_nl + 1, f);
- if (ferror(f))
- return errno > 0 ? -errno : -EIO;
-
- if (k != l && k != l + accept_extra_nl)
- return 0;
- if (memcmp(buf, blob, l) != 0)
- return 0;
- if (k > l && buf[l] != '\n')
- return 0;
-
- return 1;
-}
-
-int read_full_stream(FILE *f, char **contents, size_t *size) {
- size_t n, l;
- _cleanup_free_ char *buf = NULL;
- struct stat st;
-
- assert(f);
- assert(contents);
-
- if (fstat(fileno(f), &st) < 0)
- return -errno;
-
- n = LINE_MAX;
-
- if (S_ISREG(st.st_mode)) {
-
- /* Safety check */
- if (st.st_size > 4*1024*1024)
- return -E2BIG;
-
- /* Start with the right file size, but be prepared for
- * files from /proc which generally report a file size
- * of 0 */
- if (st.st_size > 0)
- n = st.st_size;
- }
-
- l = 0;
- for (;;) {
- char *t;
- size_t k;
-
- t = realloc(buf, n+1);
- if (!t)
- return -ENOMEM;
-
- buf = t;
- k = fread(buf + l, 1, n - l, f);
-
- if (k <= 0) {
- if (ferror(f))
- return -errno;
-
- break;
- }
-
- l += k;
- n *= 2;
-
- /* Safety check */
- if (n > 4*1024*1024)
- return -E2BIG;
- }
-
- buf[l] = 0;
- *contents = buf;
- buf = NULL; /* do not free */
-
- if (size)
- *size = l;
-
- return 0;
-}
-
-int read_full_file(const char *fn, char **contents, size_t *size) {
- _cleanup_fclose_ FILE *f = NULL;
-
- assert(fn);
- assert(contents);
-
- f = fopen(fn, "re");
- if (!f)
- return -errno;
-
- return read_full_stream(f, contents, size);
-}
-
-static int parse_env_file_internal(
- FILE *f,
- const char *fname,
- const char *newline,
- int (*push) (const char *filename, unsigned line,
- const char *key, char *value, void *userdata, int *n_pushed),
- void *userdata,
- int *n_pushed) {
-
- _cleanup_free_ char *contents = NULL, *key = NULL;
- size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1;
- char *p, *value = NULL;
- int r;
- unsigned line = 1;
-
- enum {
- PRE_KEY,
- KEY,
- PRE_VALUE,
- VALUE,
- VALUE_ESCAPE,
- SINGLE_QUOTE_VALUE,
- SINGLE_QUOTE_VALUE_ESCAPE,
- DOUBLE_QUOTE_VALUE,
- DOUBLE_QUOTE_VALUE_ESCAPE,
- COMMENT,
- COMMENT_ESCAPE
- } state = PRE_KEY;
-
- assert(newline);
-
- if (f)
- r = read_full_stream(f, &contents, NULL);
- else
- r = read_full_file(fname, &contents, NULL);
- if (r < 0)
- return r;
-
- for (p = contents; *p; p++) {
- char c = *p;
-
- switch (state) {
-
- case PRE_KEY:
- if (strchr(COMMENTS, c))
- state = COMMENT;
- else if (!strchr(WHITESPACE, c)) {
- state = KEY;
- last_key_whitespace = (size_t) -1;
-
- if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- key[n_key++] = c;
- }
- break;
-
- case KEY:
- if (strchr(newline, c)) {
- state = PRE_KEY;
- line++;
- n_key = 0;
- } else if (c == '=') {
- state = PRE_VALUE;
- last_value_whitespace = (size_t) -1;
- } else {
- if (!strchr(WHITESPACE, c))
- last_key_whitespace = (size_t) -1;
- else if (last_key_whitespace == (size_t) -1)
- last_key_whitespace = n_key;
-
- if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- key[n_key++] = c;
- }
-
- break;
-
- case PRE_VALUE:
- if (strchr(newline, c)) {
- state = PRE_KEY;
- line++;
- key[n_key] = 0;
-
- if (value)
- value[n_value] = 0;
-
- /* strip trailing whitespace from key */
- if (last_key_whitespace != (size_t) -1)
- key[last_key_whitespace] = 0;
-
- r = push(fname, line, key, value, userdata, n_pushed);
- if (r < 0)
- goto fail;
-
- n_key = 0;
- value = NULL;
- value_alloc = n_value = 0;
-
- } else if (c == '\'')
- state = SINGLE_QUOTE_VALUE;
- else if (c == '\"')
- state = DOUBLE_QUOTE_VALUE;
- else if (c == '\\')
- state = VALUE_ESCAPE;
- else if (!strchr(WHITESPACE, c)) {
- state = VALUE;
-
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
-
- break;
-
- case VALUE:
- if (strchr(newline, c)) {
- state = PRE_KEY;
- line++;
-
- key[n_key] = 0;
-
- if (value)
- value[n_value] = 0;
-
- /* Chomp off trailing whitespace from value */
- if (last_value_whitespace != (size_t) -1)
- value[last_value_whitespace] = 0;
-
- /* strip trailing whitespace from key */
- if (last_key_whitespace != (size_t) -1)
- key[last_key_whitespace] = 0;
-
- r = push(fname, line, key, value, userdata, n_pushed);
- if (r < 0)
- goto fail;
-
- n_key = 0;
- value = NULL;
- value_alloc = n_value = 0;
-
- } else if (c == '\\') {
- state = VALUE_ESCAPE;
- last_value_whitespace = (size_t) -1;
- } else {
- if (!strchr(WHITESPACE, c))
- last_value_whitespace = (size_t) -1;
- else if (last_value_whitespace == (size_t) -1)
- last_value_whitespace = n_value;
-
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
-
- break;
-
- case VALUE_ESCAPE:
- state = VALUE;
-
- if (!strchr(newline, c)) {
- /* Escaped newlines we eat up entirely */
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
- break;
-
- case SINGLE_QUOTE_VALUE:
- if (c == '\'')
- state = PRE_VALUE;
- else if (c == '\\')
- state = SINGLE_QUOTE_VALUE_ESCAPE;
- else {
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
-
- break;
-
- case SINGLE_QUOTE_VALUE_ESCAPE:
- state = SINGLE_QUOTE_VALUE;
-
- if (!strchr(newline, c)) {
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
- break;
-
- case DOUBLE_QUOTE_VALUE:
- if (c == '\"')
- state = PRE_VALUE;
- else if (c == '\\')
- state = DOUBLE_QUOTE_VALUE_ESCAPE;
- else {
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
-
- break;
-
- case DOUBLE_QUOTE_VALUE_ESCAPE:
- state = DOUBLE_QUOTE_VALUE;
-
- if (!strchr(newline, c)) {
- if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
- r = -ENOMEM;
- goto fail;
- }
-
- value[n_value++] = c;
- }
- break;
-
- case COMMENT:
- if (c == '\\')
- state = COMMENT_ESCAPE;
- else if (strchr(newline, c)) {
- state = PRE_KEY;
- line++;
- }
- break;
-
- case COMMENT_ESCAPE:
- state = COMMENT;
- break;
- }
- }
-
- if (state == PRE_VALUE ||
- state == VALUE ||
- state == VALUE_ESCAPE ||
- state == SINGLE_QUOTE_VALUE ||
- state == SINGLE_QUOTE_VALUE_ESCAPE ||
- state == DOUBLE_QUOTE_VALUE ||
- state == DOUBLE_QUOTE_VALUE_ESCAPE) {
-
- key[n_key] = 0;
-
- if (value)
- value[n_value] = 0;
-
- if (state == VALUE)
- if (last_value_whitespace != (size_t) -1)
- value[last_value_whitespace] = 0;
-
- /* strip trailing whitespace from key */
- if (last_key_whitespace != (size_t) -1)
- key[last_key_whitespace] = 0;
-
- r = push(fname, line, key, value, userdata, n_pushed);
- if (r < 0)
- goto fail;
- }
-
- return 0;
-
-fail:
- free(value);
- return r;
-}
-
-static int parse_env_file_push(
- const char *filename, unsigned line,
- const char *key, char *value,
- void *userdata,
- int *n_pushed) {
-
- const char *k;
- va_list aq, *ap = userdata;
-
- if (!utf8_is_valid(key)) {
- _cleanup_free_ char *p = NULL;
-
- p = utf8_escape_invalid(key);
- log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
- return -EINVAL;
- }
-
- if (value && !utf8_is_valid(value)) {
- _cleanup_free_ char *p = NULL;
-
- p = utf8_escape_invalid(value);
- log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
- return -EINVAL;
- }
-
- va_copy(aq, *ap);
-
- while ((k = va_arg(aq, const char *))) {
- char **v;
-
- v = va_arg(aq, char **);
-
- if (streq(key, k)) {
- va_end(aq);
- free(*v);
- *v = value;
-
- if (n_pushed)
- (*n_pushed)++;
-
- return 1;
- }
- }
-
- va_end(aq);
- free(value);
-
- return 0;
-}
-
-int parse_env_file(
- const char *fname,
- const char *newline, ...) {
-
- va_list ap;
- int r, n_pushed = 0;
-
- if (!newline)
- newline = NEWLINE;
-
- va_start(ap, newline);
- r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed);
- va_end(ap);
-
- return r < 0 ? r : n_pushed;
-}
-
-static int load_env_file_push(
- const char *filename, unsigned line,
- const char *key, char *value,
- void *userdata,
- int *n_pushed) {
- char ***m = userdata;
- char *p;
- int r;
-
- if (!utf8_is_valid(key)) {
- _cleanup_free_ char *t = utf8_escape_invalid(key);
-
- log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
- return -EINVAL;
- }
-
- if (value && !utf8_is_valid(value)) {
- _cleanup_free_ char *t = utf8_escape_invalid(value);
-
- log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
- return -EINVAL;
- }
-
- p = strjoin(key, "=", strempty(value), NULL);
- if (!p)
- return -ENOMEM;
-
- r = strv_consume(m, p);
- if (r < 0)
- return r;
-
- if (n_pushed)
- (*n_pushed)++;
-
- free(value);
- return 0;
-}
-
-int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
- char **m = NULL;
- int r;
-
- if (!newline)
- newline = NEWLINE;
-
- r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
- if (r < 0) {
- strv_free(m);
- return r;
- }
-
- *rl = m;
- return 0;
-}
-
-static int load_env_file_push_pairs(
- const char *filename, unsigned line,
- const char *key, char *value,
- void *userdata,
- int *n_pushed) {
- char ***m = userdata;
- int r;
-
- if (!utf8_is_valid(key)) {
- _cleanup_free_ char *t = utf8_escape_invalid(key);
-
- log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
- return -EINVAL;
- }
-
- if (value && !utf8_is_valid(value)) {
- _cleanup_free_ char *t = utf8_escape_invalid(value);
-
- log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
- return -EINVAL;
- }
-
- r = strv_extend(m, key);
- if (r < 0)
- return -ENOMEM;
-
- if (!value) {
- r = strv_extend(m, "");
- if (r < 0)
- return -ENOMEM;
- } else {
- r = strv_push(m, value);
- if (r < 0)
- return r;
- }
-
- if (n_pushed)
- (*n_pushed)++;
-
- return 0;
-}
-
-int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
- char **m = NULL;
- int r;
-
- if (!newline)
- newline = NEWLINE;
-
- r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
- if (r < 0) {
- strv_free(m);
- return r;
- }
-
- *rl = m;
- return 0;
-}
-
-static void write_env_var(FILE *f, const char *v) {
- const char *p;
-
- p = strchr(v, '=');
- if (!p) {
- /* Fallback */
- fputs(v, f);
- fputc('\n', f);
- return;
- }
-
- p++;
- fwrite(v, 1, p-v, f);
-
- if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
- fputc('\"', f);
-
- for (; *p; p++) {
- if (strchr(SHELL_NEED_ESCAPE, *p))
- fputc('\\', f);
-
- fputc(*p, f);
- }
-
- fputc('\"', f);
- } else
- fputs(p, f);
-
- fputc('\n', f);
-}
-
-int write_env_file(const char *fname, char **l) {
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ char *p = NULL;
- char **i;
- int r;
-
- assert(fname);
-
- r = fopen_temporary(fname, &f, &p);
- if (r < 0)
- return r;
-
- fchmod_umask(fileno(f), 0644);
-
- STRV_FOREACH(i, l)
- write_env_var(f, *i);
-
- r = fflush_and_check(f);
- if (r >= 0) {
- if (rename(p, fname) >= 0)
- return 0;
-
- r = -errno;
- }
-
- unlink(p);
- return r;
-}
-
-int executable_is_script(const char *path, char **interpreter) {
- int r;
- _cleanup_free_ char *line = NULL;
- int len;
- char *ans;
-
- assert(path);
-
- r = read_one_line_file(path, &line);
- if (r < 0)
- return r;
-
- if (!startswith(line, "#!"))
- return 0;
-
- ans = strstrip(line + 2);
- len = strcspn(ans, " \t");
-
- if (len == 0)
- return 0;
-
- ans = strndup(ans, len);
- if (!ans)
- return -ENOMEM;
-
- *interpreter = ans;
- return 1;
-}
-
-/**
- * Retrieve one field from a file like /proc/self/status. pattern
- * should not include whitespace or the delimiter (':'). pattern matches only
- * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
- * zeros after the ':' will be skipped. field must be freed afterwards.
- * terminator specifies the terminating characters of the field value (not
- * included in the value).
- */
-int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
- _cleanup_free_ char *status = NULL;
- char *t, *f;
- size_t len;
- int r;
-
- assert(terminator);
- assert(filename);
- assert(pattern);
- assert(field);
-
- r = read_full_file(filename, &status, NULL);
- if (r < 0)
- return r;
-
- t = status;
-
- do {
- bool pattern_ok;
-
- do {
- t = strstr(t, pattern);
- if (!t)
- return -ENOENT;
-
- /* Check that pattern occurs in beginning of line. */
- pattern_ok = (t == status || t[-1] == '\n');
-
- t += strlen(pattern);
-
- } while (!pattern_ok);
-
- t += strspn(t, " \t");
- if (!*t)
- return -ENOENT;
-
- } while (*t != ':');
-
- t++;
-
- if (*t) {
- t += strspn(t, " \t");
-
- /* Also skip zeros, because when this is used for
- * capabilities, we don't want the zeros. This way the
- * same capability set always maps to the same string,
- * irrespective of the total capability set size. For
- * other numbers it shouldn't matter. */
- t += strspn(t, "0");
- /* Back off one char if there's nothing but whitespace
- and zeros */
- if (!*t || isspace(*t))
- t--;
- }
-
- len = strcspn(t, terminator);
-
- f = strndup(t, len);
- if (!f)
- return -ENOMEM;
-
- *field = f;
- return 0;
-}
-
-DIR *xopendirat(int fd, const char *name, int flags) {
- int nfd;
- DIR *d;
-
- assert(!(flags & O_CREAT));
-
- nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
- if (nfd < 0)
- return NULL;
-
- d = fdopendir(nfd);
- if (!d) {
- safe_close(nfd);
- return NULL;
- }
-
- return d;
-}
-
-static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
- char **i;
-
- assert(path);
- assert(mode);
- assert(_f);
-
- if (!path_strv_resolve_uniq(search, root))
- return -ENOMEM;
-
- STRV_FOREACH(i, search) {
- _cleanup_free_ char *p = NULL;
- FILE *f;
-
- if (root)
- p = strjoin(root, *i, "/", path, NULL);
- else
- p = strjoin(*i, "/", path, NULL);
- if (!p)
- return -ENOMEM;
-
- f = fopen(p, mode);
- if (f) {
- *_f = f;
- return 0;
- }
-
- if (errno != ENOENT)
- return -errno;
- }
-
- return -ENOENT;
-}
-
-int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
- _cleanup_strv_free_ char **copy = NULL;
-
- assert(path);
- assert(mode);
- assert(_f);
-
- if (path_is_absolute(path)) {
- FILE *f;
-
- f = fopen(path, mode);
- if (f) {
- *_f = f;
- return 0;
- }
-
- return -errno;
- }
-
- copy = strv_copy((char**) search);
- if (!copy)
- return -ENOMEM;
-
- return search_and_fopen_internal(path, mode, root, copy, _f);
-}
-
-int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
- _cleanup_strv_free_ char **s = NULL;
-
- if (path_is_absolute(path)) {
- FILE *f;
-
- f = fopen(path, mode);
- if (f) {
- *_f = f;
- return 0;
- }
-
- return -errno;
- }
-
- s = strv_split_nulstr(search);
- if (!s)
- return -ENOMEM;
-
- return search_and_fopen_internal(path, mode, root, s, _f);
-}
-
-int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
- FILE *f;
- char *t;
- int r, fd;
-
- assert(path);
- assert(_f);
- assert(_temp_path);
-
- r = tempfn_xxxxxx(path, NULL, &t);
- if (r < 0)
- return r;
-
- fd = mkostemp_safe(t, O_WRONLY|O_CLOEXEC);
- if (fd < 0) {
- free(t);
- return -errno;
- }
-
- f = fdopen(fd, "we");
- if (!f) {
- unlink_noerrno(t);
- free(t);
- safe_close(fd);
- return -errno;
- }
-
- *_f = f;
- *_temp_path = t;
-
- return 0;
-}
-
-int fflush_and_check(FILE *f) {
- assert(f);
-
- errno = 0;
- fflush(f);
-
- if (ferror(f))
- return errno > 0 ? -errno : -EIO;
-
- return 0;
-}
-
-/* This is much like mkostemp() but is subject to umask(). */
-int mkostemp_safe(char *pattern, int flags) {
- _cleanup_umask_ mode_t u = 0;
- int fd;
-
- assert(pattern);
-
- u = umask(077);
-
- fd = mkostemp(pattern, flags);
- if (fd < 0)
- return -errno;
-
- return fd;
-}
-
-int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
- const char *fn;
- char *t;
-
- assert(p);
- assert(ret);
-
- /*
- * Turns this:
- * /foo/bar/waldo
- *
- * Into this:
- * /foo/bar/.#<extra>waldoXXXXXX
- */
-
- fn = basename(p);
- if (!filename_is_valid(fn))
- return -EINVAL;
-
- if (extra == NULL)
- extra = "";
-
- t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
- if (!t)
- return -ENOMEM;
-
- strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
-
- *ret = path_kill_slashes(t);
- return 0;
-}
-
-int tempfn_random(const char *p, const char *extra, char **ret) {
- const char *fn;
- char *t, *x;
- uint64_t u;
- unsigned i;
-
- assert(p);
- assert(ret);
-
- /*
- * Turns this:
- * /foo/bar/waldo
- *
- * Into this:
- * /foo/bar/.#<extra>waldobaa2a261115984a9
- */
-
- fn = basename(p);
- if (!filename_is_valid(fn))
- return -EINVAL;
-
- if (!extra)
- extra = "";
-
- t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
- if (!t)
- return -ENOMEM;
-
- x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
-
- u = random_u64();
- for (i = 0; i < 16; i++) {
- *(x++) = hexchar(u & 0xF);
- u >>= 4;
- }
-
- *x = 0;
-
- *ret = path_kill_slashes(t);
- return 0;
-}
-
-int tempfn_random_child(const char *p, const char *extra, char **ret) {
- char *t, *x;
- uint64_t u;
- unsigned i;
-
- assert(p);
- assert(ret);
-
- /* Turns this:
- * /foo/bar/waldo
- * Into this:
- * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
- */
-
- if (!extra)
- extra = "";
-
- t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
- if (!t)
- return -ENOMEM;
-
- x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
-
- u = random_u64();
- for (i = 0; i < 16; i++) {
- *(x++) = hexchar(u & 0xF);
- u >>= 4;
- }
-
- *x = 0;
-
- *ret = path_kill_slashes(t);
- return 0;
-}
-
-int write_timestamp_file_atomic(const char *fn, usec_t n) {
- char ln[DECIMAL_STR_MAX(n)+2];
-
- /* Creates a "timestamp" file, that contains nothing but a
- * usec_t timestamp, formatted in ASCII. */
-
- if (n <= 0 || n >= USEC_INFINITY)
- return -ERANGE;
-
- xsprintf(ln, USEC_FMT "\n", n);
-
- return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
-}
-
-int read_timestamp_file(const char *fn, usec_t *ret) {
- _cleanup_free_ char *ln = NULL;
- uint64_t t;
- int r;
-
- r = read_one_line_file(fn, &ln);
- if (r < 0)
- return r;
-
- r = safe_atou64(ln, &t);
- if (r < 0)
- return r;
-
- if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
- return -ERANGE;
-
- *ret = (usec_t) t;
- return 0;
-}
-
-int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
- int r;
-
- assert(s);
-
- /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
- * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
- * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
- * element, but not before the first one. */
-
- if (!f)
- f = stdout;
-
- if (space) {
- if (!separator)
- separator = " ";
-
- if (*space) {
- r = fputs(separator, f);
- if (r < 0)
- return r;
- }
-
- *space = true;
- }
-
- return fputs(s, f);
-}
-
-int open_tmpfile_unlinkable(const char *directory, int flags) {
- char *p;
- int fd;
-
- if (!directory)
- directory = "/tmp";
-
- /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
-
-#ifdef O_TMPFILE
- /* Try O_TMPFILE first, if it is supported */
- fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
- if (fd >= 0)
- return fd;
-#endif
-
- /* Fall back to unguessable name + unlinking */
- p = strjoina(directory, "/systemd-tmp-XXXXXX");
-
- fd = mkostemp_safe(p, flags);
- if (fd < 0)
- return fd;
-
- (void) unlink(p);
-
- return fd;
-}
-
-int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
- _cleanup_free_ char *tmp = NULL;
- int r, fd;
-
- assert(target);
- assert(ret_path);
-
- /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
- assert((flags & O_EXCL) == 0);
-
- /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
- * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
- * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
-
-#ifdef O_TMPFILE
- {
- _cleanup_free_ char *dn = NULL;
-
- dn = dirname_malloc(target);
- if (!dn)
- return -ENOMEM;
-
- fd = open(dn, O_TMPFILE|flags, 0640);
- if (fd >= 0) {
- *ret_path = NULL;
- return fd;
- }
-
- log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
- }
-#endif
-
- r = tempfn_random(target, NULL, &tmp);
- if (r < 0)
- return r;
-
- fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
- if (fd < 0)
- return -errno;
-
- *ret_path = tmp;
- tmp = NULL;
-
- return fd;
-}
-
-int link_tmpfile(int fd, const char *path, const char *target) {
-
- assert(fd >= 0);
- assert(target);
-
- /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
- * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
- * on the directory, and renameat2() is used instead.
- *
- * Note that in both cases we will not replace existing files. This is because linkat() does not support this
- * operation currently (renameat2() does), and there is no nice way to emulate this. */
-
- if (path) {
- if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
- return -errno;
- } else {
- char proc_fd_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
-
- xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
-
- if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
- return -errno;
- }
-
- return 0;
-}
-
-int read_nul_string(FILE *f, char **ret) {
- _cleanup_free_ char *x = NULL;
- size_t allocated = 0, n = 0;
-
- assert(f);
- assert(ret);
-
- /* Reads a NUL-terminated string from the specified file. */
-
- for (;;) {
- int c;
-
- if (!GREEDY_REALLOC(x, allocated, n+2))
- return -ENOMEM;
-
- c = fgetc(f);
- if (c == 0) /* Terminate at NUL byte */
- break;
- if (c == EOF) {
- if (ferror(f))
- return -errno;
- break; /* Terminate at EOF */
- }
-
- x[n++] = (char) c;
- }
-
- if (x)
- x[n] = 0;
- else {
- x = new0(char, 1);
- if (!x)
- return -ENOMEM;
- }
-
- *ret = x;
- x = NULL;
-
- return 0;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-25 21:41:33 +0000