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63 lines
1.0 KiB
63 lines
1.0 KiB
2 months ago
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/*
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* UCW Library -- Careful Read/Write
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*
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* (c) 2004--2012 Martin Mares <mj@ucw.cz>
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* (c) 2020 Jan Filip Chadima <jfch@jagda.eu>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/io.h>
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#include <errno.h>
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#include <unistd.h>
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/*
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* Reads and writes on sockets and pipes can return partial results,
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* so we implement an iterated read/write call.
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*/
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int
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careful_read(int fd, void *buf, size_t len)
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{
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byte *pos = buf;
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while (len)
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{
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ssize_t l = read(fd, pos, len);
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if (l < 0)
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{
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if (errno == EINTR)
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continue;
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return -1;
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}
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if (!l)
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return 0;
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pos += l;
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len -= l;
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}
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return 1;
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}
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int
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careful_write(int fd, const void *buf, size_t len)
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{
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const byte *pos = buf;
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while (len)
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{
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ssize_t l = write(fd, pos, len);
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if (l < 0)
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{
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if (errno == EINTR)
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continue;
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return -1;
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}
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if (!l)
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return 0;
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pos += l;
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len -= l;
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}
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return 1;
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}
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