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C code to capture system data ()

How can I capture the output from the command system()

? For example, system("ls")

should get all files in this directory. I am using a Linux machine (if that matters). Also, I know what popen

can be used for data redirection as mentioned here.

Optimizing capturing stdout from system () command

but I specifically want to use the command system

. Is there a way to do this without redirecting the output to a file, for example system("ls >> filename")

?

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2 answers


Ok so I found a way to do this

dup2(out_pipe[1], STDOUT_FILENO);
close(out_pipe[1]);

system(command);
fflush(stdout);

read(out_pipe[0], buffer, MAX_LEN);


This can be used to redirect output from a system command using pipes

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you can use popen () #include



   FILE *popen(const char *command, const char *type);

   int pclose(FILE *stream);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   popen(), pclose(): _POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE || _POSIX_SOURCE _BSD_SOURCE || _SVID_SOURCE
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