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DL6ER
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* Pi-hole: A black hole for Internet advertisements
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* (c) 2020 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* FTL Engine
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* Pi-hole syscall implementation for write
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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#include "../FTL.h"
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//#include "syscalls.h" is implicitly done in FTL.h
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#include "../log.h"
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#undef write
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ssize_t FTLwrite(int fd, const void *buf, size_t total, const char *file, const char *func, const int line)
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{
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if(buf == NULL)
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{
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log_err("Trying to write a NULL string in %s() (%s:%i)", func, file, line);
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return 0;
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}
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ssize_t ret = 0;
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size_t written = 0;
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do
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{
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// Reset errno before trying to write
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errno = 0;
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ret = write(fd, buf, total);
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if(ret > 0)
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written += ret;
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}
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// Try to write the remaining content into the stream if
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// (a) we haven't written all the data, however, there was no other error
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// (b) the last write() call failed due to an interruption by an incoming signal
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while((written < total && errno == 0) || (ret < 0 && errno == EINTR));
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// Backup errno value
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const int _errno = errno;
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// Final error checking (may have failed for some other reason then an
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// EINTR = interrupted system call)
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if(written < total)
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log_warn("Could not write() everything in %s() [%s:%i]: %s",
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func, file, line, strerror(errno));
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// Restore errno value
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errno = _errno;
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// Return number of written bytes
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return written;
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} |