mirror of
https://github.com/postgrespro/pg_probackup.git
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85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* fetch.c
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* Functions for fetching files from PostgreSQL data directory
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*
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* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "catalog/catalog.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include "pg_probackup.h"
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/*
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* Read a file into memory. The file to be read is <datadir>/<path>.
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* The file contents are returned in a malloc'd buffer, and *filesize
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* is set to the length of the file.
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*
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* The returned buffer is always zero-terminated; the size of the returned
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* buffer is actually *filesize + 1. That's handy when reading a text file.
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* This function can be used to read binary files as well, you can just
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* ignore the zero-terminator in that case.
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*
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*/
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char *
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slurpFile(const char *datadir, const char *path, size_t *filesize, bool safe)
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{
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int fd;
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char *buffer;
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struct stat statbuf;
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char fullpath[MAXPGPATH];
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int len;
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snprintf(fullpath, sizeof(fullpath), "%s/%s", datadir, path);
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if ((fd = open(fullpath, O_RDONLY | PG_BINARY, 0)) == -1)
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{
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if (safe)
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return NULL;
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else
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elog(ERROR, "could not open file \"%s\" for reading: %s",
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fullpath, strerror(errno));
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}
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if (fstat(fd, &statbuf) < 0)
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{
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if (safe)
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return NULL;
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else
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elog(ERROR, "could not open file \"%s\" for reading: %s",
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fullpath, strerror(errno));
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}
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len = statbuf.st_size;
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buffer = pg_malloc(len + 1);
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if (read(fd, buffer, len) != len)
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{
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if (safe)
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return NULL;
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else
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elog(ERROR, "could not read file \"%s\": %s\n",
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fullpath, strerror(errno));
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}
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close(fd);
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/* Zero-terminate the buffer. */
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buffer[len] = '\0';
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if (filesize)
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*filesize = len;
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return buffer;
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}
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