PostgreSQL Source Code: src/common/rmtree.c Source File

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rmtree.c
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1/*-------------------------------------------------------------------------
2 *
3 * rmtree.c
4 *
5 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
6 * Portions Copyright (c) 1994, Regents of the University of California
7 *
8 * IDENTIFICATION
9 * src/common/rmtree.c
10 *
11 *-------------------------------------------------------------------------
12 */
13
14#ifndef FRONTEND
15#include "postgres.h"
16#else
17#include "postgres_fe.h"
18#endif
19
20#include <unistd.h>
21#include <sys/stat.h>
22
23#include "common/file_utils.h"
24
25#ifndef FRONTEND
26#include "storage/fd.h"
27 #define pg_log_warning(...) elog(WARNING, __VA_ARGS__)
28 #define LOG_LEVEL WARNING
29 #define OPENDIR(x) AllocateDir(x)
30 #define CLOSEDIR(x) FreeDir(x)
31#else
32#include "common/logging.h"
33#define LOG_LEVEL PG_LOG_WARNING
34#define OPENDIR(x) opendir(x)
35#define CLOSEDIR(x) closedir(x)
36#endif
37
38/*
39 * rmtree
40 *
41 * Delete a directory tree recursively.
42 * Assumes path points to a valid directory.
43 * Deletes everything under path.
44 * If rmtopdir is true deletes the directory too.
45 * Returns true if successful, false if there was any problem.
46 * (The details of the problem are reported already, so caller
47 * doesn't really have to say anything more, but most do.)
48 */
49bool
50 rmtree(const char *path, bool rmtopdir)
51{
52 char pathbuf[MAXPGPATH];
53 DIR *dir;
54 struct dirent *de;
55 bool result = true;
56 size_t dirnames_size = 0;
57 size_t dirnames_capacity = 8;
58 char **dirnames;
59
60 dir = OPENDIR(path);
61 if (dir == NULL)
62 {
63 pg_log_warning("could not open directory \"%s\": %m", path);
64 return false;
65 }
66
67 dirnames = (char **) palloc(sizeof(char *) * dirnames_capacity);
68
69 while (errno = 0, (de = readdir(dir)))
70 {
71 if (strcmp(de->d_name, ".") == 0 ||
72 strcmp(de->d_name, "..") == 0)
73 continue;
74 snprintf(pathbuf, sizeof(pathbuf), "%s/%s", path, de->d_name);
75 switch (get_dirent_type(pathbuf, de, false, LOG_LEVEL))
76 {
77 case PGFILETYPE_ERROR:
78 /* already logged, press on */
79 break;
80 case PGFILETYPE_DIR:
81
82 /*
83 * Defer recursion until after we've closed this directory, to
84 * avoid using more than one file descriptor at a time.
85 */
86 if (dirnames_size == dirnames_capacity)
87 {
88 dirnames = repalloc(dirnames,
89 sizeof(char *) * dirnames_capacity * 2);
90 dirnames_capacity *= 2;
91 }
92 dirnames[dirnames_size++] = pstrdup(pathbuf);
93 break;
94 default:
95 if (unlink(pathbuf) != 0 && errno != ENOENT)
96 {
97 pg_log_warning("could not remove file \"%s\": %m", pathbuf);
98 result = false;
99 }
100 break;
101 }
102 }
103
104 if (errno != 0)
105 {
106 pg_log_warning("could not read directory \"%s\": %m", path);
107 result = false;
108 }
109
110 CLOSEDIR(dir);
111
112 /* Now recurse into the subdirectories we found. */
113 for (size_t i = 0; i < dirnames_size; ++i)
114 {
115 if (!rmtree(dirnames[i], true))
116 result = false;
117 pfree(dirnames[i]);
118 }
119
120 if (rmtopdir)
121 {
122 if (rmdir(path) != 0)
123 {
124 pg_log_warning("could not remove directory \"%s\": %m", path);
125 result = false;
126 }
127 }
128
129 pfree(dirnames);
130
131 return result;
132}
struct dirent * readdir(DIR *)
Definition: dirent.c:78
PGFileType get_dirent_type(const char *path, const struct dirent *de, bool look_through_symlinks, int elevel)
Definition: file_utils.c:547
@ PGFILETYPE_DIR
Definition: file_utils.h:23
@ PGFILETYPE_ERROR
Definition: file_utils.h:20
i
int i
Definition: isn.c:77
char * pstrdup(const char *in)
Definition: mcxt.c:1759
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1610
void pfree(void *pointer)
Definition: mcxt.c:1594
void * palloc(Size size)
Definition: mcxt.c:1365
#define MAXPGPATH
#define snprintf
Definition: port.h:239
#define LOG_LEVEL
Definition: rmtree.c:28
#define OPENDIR(x)
Definition: rmtree.c:29
#define CLOSEDIR(x)
Definition: rmtree.c:30
bool rmtree(const char *path, bool rmtopdir)
Definition: rmtree.c:50
#define pg_log_warning(...)
Definition: rmtree.c:27
Definition: dirent.c:26
Definition: dirent.h:10
char d_name[MAX_PATH]
Definition: dirent.h:15

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