Root/tools/perf/util/wrapper.c

1/*
2 * Various trivial helper wrappers around standard functions
3 */
4#include "cache.h"
5
6/*
7 * There's no pack memory to release - but stay close to the Git
8 * version so wrap this away:
9 */
10static inline void release_pack_memory(size_t size __used, int flag __used)
11{
12}
13
14char *xstrdup(const char *str)
15{
16    char *ret = strdup(str);
17    if (!ret) {
18        release_pack_memory(strlen(str) + 1, -1);
19        ret = strdup(str);
20        if (!ret)
21            die("Out of memory, strdup failed");
22    }
23    return ret;
24}
25
26void *xmalloc(size_t size)
27{
28    void *ret = malloc(size);
29    if (!ret && !size)
30        ret = malloc(1);
31    if (!ret) {
32        release_pack_memory(size, -1);
33        ret = malloc(size);
34        if (!ret && !size)
35            ret = malloc(1);
36        if (!ret)
37            die("Out of memory, malloc failed");
38    }
39#ifdef XMALLOC_POISON
40    memset(ret, 0xA5, size);
41#endif
42    return ret;
43}
44
45/*
46 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
47 * "data" to the allocated memory, zero terminates the allocated memory,
48 * and returns a pointer to the allocated memory. If the allocation fails,
49 * the program dies.
50 */
51void *xmemdupz(const void *data, size_t len)
52{
53    char *p = xmalloc(len + 1);
54    memcpy(p, data, len);
55    p[len] = '\0';
56    return p;
57}
58
59char *xstrndup(const char *str, size_t len)
60{
61    char *p = memchr(str, '\0', len);
62
63    return xmemdupz(str, p ? (size_t)(p - str) : len);
64}
65
66void *xrealloc(void *ptr, size_t size)
67{
68    void *ret = realloc(ptr, size);
69    if (!ret && !size)
70        ret = realloc(ptr, 1);
71    if (!ret) {
72        release_pack_memory(size, -1);
73        ret = realloc(ptr, size);
74        if (!ret && !size)
75            ret = realloc(ptr, 1);
76        if (!ret)
77            die("Out of memory, realloc failed");
78    }
79    return ret;
80}
81
82/*
83 * xread() is the same a read(), but it automatically restarts read()
84 * operations with a recoverable error (EAGAIN and EINTR). xread()
85 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
86 */
87static ssize_t xread(int fd, void *buf, size_t len)
88{
89    ssize_t nr;
90    while (1) {
91        nr = read(fd, buf, len);
92        if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
93            continue;
94        return nr;
95    }
96}
97
98/*
99 * xwrite() is the same a write(), but it automatically restarts write()
100 * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
101 * GUARANTEE that "len" bytes is written even if the operation is successful.
102 */
103static ssize_t xwrite(int fd, const void *buf, size_t len)
104{
105    ssize_t nr;
106    while (1) {
107        nr = write(fd, buf, len);
108        if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
109            continue;
110        return nr;
111    }
112}
113
114ssize_t read_in_full(int fd, void *buf, size_t count)
115{
116    char *p = buf;
117    ssize_t total = 0;
118
119    while (count > 0) {
120        ssize_t loaded = xread(fd, p, count);
121        if (loaded <= 0)
122            return total ? total : loaded;
123        count -= loaded;
124        p += loaded;
125        total += loaded;
126    }
127
128    return total;
129}
130
131ssize_t write_in_full(int fd, const void *buf, size_t count)
132{
133    const char *p = buf;
134    ssize_t total = 0;
135
136    while (count > 0) {
137        ssize_t written = xwrite(fd, p, count);
138        if (written < 0)
139            return -1;
140        if (!written) {
141            errno = ENOSPC;
142            return -1;
143        }
144        count -= written;
145        p += written;
146        total += written;
147    }
148
149    return total;
150}
151

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