Root/tools/perf/util/util.c

1#include "util.h"
2#include <sys/mman.h>
3
4int mkdir_p(char *path, mode_t mode)
5{
6    struct stat st;
7    int err;
8    char *d = path;
9
10    if (*d != '/')
11        return -1;
12
13    if (stat(path, &st) == 0)
14        return 0;
15
16    while (*++d == '/');
17
18    while ((d = strchr(d, '/'))) {
19        *d = '\0';
20        err = stat(path, &st) && mkdir(path, mode);
21        *d++ = '/';
22        if (err)
23            return -1;
24        while (*d == '/')
25            ++d;
26    }
27    return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
28}
29
30static int slow_copyfile(const char *from, const char *to)
31{
32    int err = 0;
33    char *line = NULL;
34    size_t n;
35    FILE *from_fp = fopen(from, "r"), *to_fp;
36
37    if (from_fp == NULL)
38        goto out;
39
40    to_fp = fopen(to, "w");
41    if (to_fp == NULL)
42        goto out_fclose_from;
43
44    while (getline(&line, &n, from_fp) > 0)
45        if (fputs(line, to_fp) == EOF)
46            goto out_fclose_to;
47    err = 0;
48out_fclose_to:
49    fclose(to_fp);
50    free(line);
51out_fclose_from:
52    fclose(from_fp);
53out:
54    return err;
55}
56
57int copyfile(const char *from, const char *to)
58{
59    int fromfd, tofd;
60    struct stat st;
61    void *addr;
62    int err = -1;
63
64    if (stat(from, &st))
65        goto out;
66
67    if (st.st_size == 0) /* /proc? do it slowly... */
68        return slow_copyfile(from, to);
69
70    fromfd = open(from, O_RDONLY);
71    if (fromfd < 0)
72        goto out;
73
74    tofd = creat(to, 0755);
75    if (tofd < 0)
76        goto out_close_from;
77
78    addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
79    if (addr == MAP_FAILED)
80        goto out_close_to;
81
82    if (write(tofd, addr, st.st_size) == st.st_size)
83        err = 0;
84
85    munmap(addr, st.st_size);
86out_close_to:
87    close(tofd);
88    if (err)
89        unlink(to);
90out_close_from:
91    close(fromfd);
92out:
93    return err;
94}
95

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