process_stream_open

Processes and signals32

Objective

Implement process_stream_open, a small process launcher that exposes one end of a pipe.

Steps

Create process_stream_open.c.
Expose int process_stream_open(const char *file, char *const argv[], char mode);.
Launch file with argv through execvp in a child process.
When mode is 'r', return a file descriptor that reads from the child process standard output.
When mode is 'w', return a file descriptor that writes to the child process standard input.
Return -1 for invalid arguments, invalid mode, pipe failure, or fork failure.
Close every pipe end that is not needed in each process.
The parent must not wait for the child in this function.

examples

$ process_stream_open("printf", (char *const []){"printf", "ready\\n", NULL}, 'r')

fd reading ready\n

$ process_stream_open("cat", (char *const []){"cat", NULL}, 'w')

fd writing to child stdin

Constraints

Expected files

process_stream_open.c

Allowed functions

pipeforkdup2execvpcloseexit

Tests

Run the tests to grade your code

Build

01Invalid inputs return -1

02Read mode captures child stdout

03Read mode works with argv commands

04Write mode feeds child stdin

05Parent returns a pipe fd even when child exec fails later

process_stream_open

Objective

Implement process_stream_open, a small process launcher that exposes one end of a pipe.

Steps

Create process_stream_open.c.
Expose int process_stream_open(const char *file, char *const argv[], char mode);.
Launch file with argv through execvp in a child process.
When mode is 'r', return a file descriptor that reads from the child process standard output.
When mode is 'w', return a file descriptor that writes to the child process standard input.
Return -1 for invalid arguments, invalid mode, pipe failure, or fork failure.
Close every pipe end that is not needed in each process.
The parent must not wait for the child in this function.

examples

$ process_stream_open("printf", (char *const []){"printf", "ready\\n", NULL}, 'r')

fd reading ready\n

$ process_stream_open("cat", (char *const []){"cat", NULL}, 'w')

fd writing to child stdin

Constraints

Expected files

process_stream_open.c

Allowed functions

pipeforkdup2execvpcloseexit

process_stream_open

Processes and signals32

Objective

Implement process_stream_open, a small process launcher that exposes one end of a pipe.

Steps

Create process_stream_open.c.
Expose int process_stream_open(const char *file, char *const argv[], char mode);.
Launch file with argv through execvp in a child process.
When mode is 'r', return a file descriptor that reads from the child process standard output.
When mode is 'w', return a file descriptor that writes to the child process standard input.
Return -1 for invalid arguments, invalid mode, pipe failure, or fork failure.
Close every pipe end that is not needed in each process.
The parent must not wait for the child in this function.

examples

$ process_stream_open("printf", (char *const []){"printf", "ready\\n", NULL}, 'r')

fd reading ready\n

$ process_stream_open("cat", (char *const []){"cat", NULL}, 'w')

fd writing to child stdin

Constraints

Expected files

process_stream_open.c

Allowed functions

pipeforkdup2execvpcloseexit

Tests

Run the tests to grade your code

Build

01Invalid inputs return -1

02Read mode captures child stdout

03Read mode works with argv commands

04Write mode feeds child stdin

05Parent returns a pipe fd even when child exec fails later