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man write

Bolaji Oyedele answered on April 19, 2022 Popularity 3/10 Helpfulness 1/10

answer man write

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man write

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#include <unistd.h>

       ssize_t write(int fd, const void *buf, size_t count);

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Contributed on Apr 19 2022

Bolaji Oyedele

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write() writes up to count bytes from the buffer starting at buf
       to the file referred to by the file descriptor fd.

       The number of bytes written may be less than count if, for
       example, there is insufficient space on the underlying physical
       medium, or the RLIMIT_FSIZE resource limit is encountered (see
       setrlimit(2)), or the call was interrupted by a signal handler
       after having written less than count bytes.  (See also pipe(7).)

       For a seekable file (i.e., one to which lseek(2) may be applied,
       for example, a regular file) writing takes place at the file
       offset, and the file offset is incremented by the number of bytes
       actually written.  If the file was open(2)ed with O_APPEND, the
       file offset is first set to the end of the file before writing.
       The adjustment of the file offset and the write operation are
       performed as an atomic step.

       POSIX requires that a read(2) that can be proved to occur after a
       write() has returned will return the new data.  Note that not all
       filesystems are POSIX conforming.

       According to POSIX.1, if count is greater than SSIZE_MAX, the
       result is implementation-defined; see NOTES for the upper limit
       on Linux.

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Source: man7.org

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Contributed on Apr 19 2022

Bolaji Oyedele

0 Answers Avg Quality 2/10

man write

Comment

write() writes up to count bytes from the buffer starting at buf
       to the file referred to by the file descriptor fd.

       The number of bytes written may be less than count if, for
       example, there is insufficient space on the underlying physical
       medium, or the RLIMIT_FSIZE resource limit is encountered (see
       setrlimit(2)), or the call was interrupted by a signal handler
       after having written less than count bytes.  (See also pipe(7).)

       For a seekable file (i.e., one to which lseek(2) may be applied,
       for example, a regular file) writing takes place at the file
       offset, and the file offset is incremented by the number of bytes
       actually written.  If the file was open(2)ed with O_APPEND, the
       file offset is first set to the end of the file before writing.
       The adjustment of the file offset and the write operation are
       performed as an atomic step.

       POSIX requires that a read(2) that can be proved to occur after a
       write() has returned will return the new data.  Note that not all
       filesystems are POSIX conforming.

       According to POSIX.1, if count is greater than SSIZE_MAX, the
       result is implementation-defined; see NOTES for the upper limit
       on Linux.

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Source: man7.org

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Contributed on Apr 19 2022

Bolaji Oyedele

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