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annotate lib/openat-proc.c @ 40231:9b3c79fdfe0b

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strtod: fix clash with strtold Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817). * lib/strtod.c (compute_minus_zero, minus_zero): Simplify by remving the macro / external variable, and having just a function. User changed. This avoids the need for an external variable that might clash.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 11 Mar 2019 16:40:29 -0700
parents b06060465f09
children
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1 /* Create /proc/self/fd-related names for subfiles of open directories.
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2
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3 Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 #include <config.h>
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21
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22 #include "openat-priv.h"
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23
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24 #include <sys/types.h>
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25 #include <sys/stat.h>
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26 #include <fcntl.h>
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31 #include <unistd.h>
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32
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33 #ifdef __KLIBC__
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34 # include <InnoTekLIBC/backend.h>
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35 #endif
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36
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37 #include "intprops.h"
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38
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39 /* Set BUF to the name of the subfile of the directory identified by
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40 FD, where the subfile is named FILE. If successful, return BUF if
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41 the result fits in BUF, dynamically allocated memory otherwise.
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42 Return NULL (setting errno) on error. */
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43 char *
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44 openat_proc_name (char buf[OPENAT_BUFFER_SIZE], int fd, char const *file)
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45 {
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46 char *result = buf;
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47 int dirlen;
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48
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49 /* Make sure the caller gets ENOENT when appropriate. */
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50 if (!*file)
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51 {
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52 buf[0] = '\0';
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53 return buf;
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54 }
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55
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56 #ifndef __KLIBC__
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57 # define PROC_SELF_FD_FORMAT "/proc/self/fd/%d/"
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58 {
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59 enum {
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60 PROC_SELF_FD_DIR_SIZE_BOUND
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61 = (sizeof PROC_SELF_FD_FORMAT - (sizeof "%d" - 1)
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62 + INT_STRLEN_BOUND (int))
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63 };
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64
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65 static int proc_status = 0;
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66 if (! proc_status)
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67 {
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68 /* Set PROC_STATUS to a positive value if /proc/self/fd is
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69 reliable, and a negative value otherwise. Solaris 10
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70 /proc/self/fd mishandles "..", and any file name might expand
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71 to ".." after symbolic link expansion, so avoid /proc/self/fd
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72 if it mishandles "..". Solaris 10 has openat, but this
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73 problem is exhibited on code that built on Solaris 8 and
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74 running on Solaris 10. */
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75
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76 int proc_self_fd = open ("/proc/self/fd",
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77 O_SEARCH | O_DIRECTORY | O_NOCTTY | O_NONBLOCK);
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78 if (proc_self_fd < 0)
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79 proc_status = -1;
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80 else
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81 {
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82 /* Detect whether /proc/self/fd/%i/../fd exists, where %i is the
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83 number of a file descriptor open on /proc/self/fd. On Linux,
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84 that name resolves to /proc/self/fd, which was opened above.
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85 However, on Solaris, it may resolve to /proc/self/fd/fd, which
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86 cannot exist, since all names in /proc/self/fd are numeric. */
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87 char dotdot_buf[PROC_SELF_FD_DIR_SIZE_BOUND + sizeof "../fd" - 1];
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88 sprintf (dotdot_buf, PROC_SELF_FD_FORMAT "../fd", proc_self_fd);
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89 proc_status = access (dotdot_buf, F_OK) ? -1 : 1;
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90 close (proc_self_fd);
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91 }
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92 }
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93
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94 if (proc_status < 0)
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95 return NULL;
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96 else
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97 {
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98 size_t bufsize = PROC_SELF_FD_DIR_SIZE_BOUND + strlen (file);
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99 if (OPENAT_BUFFER_SIZE < bufsize)
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100 {
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101 result = malloc (bufsize);
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102 if (! result)
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103 return NULL;
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104 }
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105
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106 dirlen = sprintf (result, PROC_SELF_FD_FORMAT, fd);
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107 }
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108 }
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109 #else
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110 /* OS/2 kLIBC provides a function to retrieve a path from a fd. */
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111 {
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112 char dir[_MAX_PATH];
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113 size_t bufsize;
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114
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115 if (__libc_Back_ioFHToPath (fd, dir, sizeof dir))
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116 return NULL;
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117
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118 dirlen = strlen (dir);
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119 bufsize = dirlen + 1 + strlen (file) + 1; /* 1 for '/', 1 for null */
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120 if (OPENAT_BUFFER_SIZE < bufsize)
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121 {
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122 result = malloc (bufsize);
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123 if (! result)
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124 return NULL;
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125 }
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126
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127 strcpy (result, dir);
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128 result[dirlen++] = '/';
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129 }
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130 #endif
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131
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132 strcpy (result + dirlen, file);
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133 return result;
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0f8d70c02f29 [lib/ChangeLog]
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
134 }