reading standard output via read function instead of fread

Question

I would like my program to read the standard output produced by another application. I am aware that I can use popen to do that and use fread to read that output.

Do you know whether is possible to use read (and possibly open)? I am working in LINUX with C/C++

how about with your shell `$./program1 | ./program2`, this connects the stdout of progam1 to stdin of program2. — hetepeperfan, Jul 31 '13 at 09:26
if you use pipe you don't need open, just read(pipe[], buffer, len) — Alexis, Jul 31 '13 at 09:29
@Jan. ..reading better my question, you are right.It is ok with using popen (also because I can give the caommand and args I want to run), but I do prefer using open instead of fread. — Abruzzo Forte e Gentile, Jul 31 '13 at 10:08

score 2 · Accepted Answer · edited May 23 '17 at 12:05

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You can get a file descriptor for read() by calling int fd = fileno(fp) for the FILE *fp you have got from popen(). But be aware that you must not mix calling read() and fread()!

EDIT

If you want to avoid popen(), you have to use pipe(), fork(), exec..() and dup2() like it's done here

edited May 23 '17 at 12:05

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answered Jul 31 '13 at 09:30

Ingo Leonhardt

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reading standard output via read function instead of fread

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