• ​Purpose: List memory-mapped files (including loaded libraries) for a running process.
• ​Steps:
  1. Find the Process ID (PID):

     ps aux | grep <APP_NAME>

  2. List loaded libraries:

     cat /proc/<PID>/maps | grep libSynMMM.so

• ​Output: Full path of the loaded library (e.g., /home/user1/qppp/p121/bin/latest/libSynMMM.so).

• ​Purpose: List open files by a process.
• ​Steps:
  1. Find the PID (as above).
  2. Filter for the library:

     lsof -p <PID> | grep libSynMMM.so

• ​Output: Path of the loaded library.

• ​Purpose: Show memory mappings of a process.
• ​Steps:
  1. Find the PID (as above).
  2. Filter for the library:

     pmap <PID> | grep libSynMMM.so

• ​Output: Memory address and path of the loaded library.

• ​Purpose: Trace library loading in real-time.
• ​Steps:

  LD_DEBUG=libs <YOUR_APP> 2>&1 | grep libSynMMM.so
  

https://gist.github.com/yiliu30/9ceb9c073dcf6b17b21a411d745aca14

# https://bytes.usc.edu/cs104/wiki/gcc
# Compile a single program
g++ -Wall -g -std=c++17 test.cpp -o test

# Linking Multiple Files
gcc -o prog main.c sum.c

# Print all possible warning flags available to compile with
g++ --help=warnings

# Compile program using header files in ./include
# $(pwd) will expand to your current working directory
g++ -I /$(pwd)/include -Wall -g -std=c++17 test.cpp -o test

# Compile and optimize in parallel for helpful warnings about potential bugs
g++ -O2 -Wall -std=c++17 main.cpp -o main

gcc [options] [input files] [output file]

• gcc file.c: Compiles file.c and generates an executable a.out.
• gcc -o output file.c: Compiles file.c and generates an executable named output.

• gcc -c file.c: Compiles file.c to an object file file.o without linking.

• gcc -o output file1.c file2.c: Compiles file1.c and file2.c, and links them into a single executable named output.

• -O0: No optimization (default).
• -O1: Basic optimization.
• -O2: Further optimization.
• -O3: Maximum optimization.
• -Os: Optimize for size.
• -Og: Optimize for debugging.

• -g: Generates debug information to be used by GDB (GNU Debugger).

• -Wall: Enables most warning messages.
• -Werror: Treats warnings as errors.

• -Dname: Defines a macro name.
• -Dname=value: Defines a macro name with the value value.

• -I directory: Adds directory to the list of directories to be searched for header files.

• -L directory: Adds directory to the list of directories to be searched for libraries.
• -l library: Links with the library library.

• -std=c89: Conforms to the ISO C89 standard.
• -std=c99: Conforms to the ISO C99 standard.
• -std=c11: Conforms to the ISO C11 standard.

gcc -o myprogram main.c

gcc -g -o myprogram main.c

gcc -O2 -o myprogram main.c

gcc -o myprogram main.c utils.c

gcc -DDEBUG -I./includes -o myprogram main.c

gcc -o myprogram main.c -L./lib -lmylib