Hello Triangle: An OpenGL ES 3.0 Example - Praise for OpenGL ES 30 Programming Guide - page 37

GLuint LoadShader(GLenum type, const char *shaderSrc)
{
GLuint shader;
GLint compiled;
// Create the shader object
shader = glCreateShader(type);
if(shader == 0)
return 0;
The shader source code itself is loaded to the shader object
using glShaderSource . The shader is then compiled using the
glCompileShader function.
// Load the shader source
glShaderSource(shader, 1, &shaderSrc, NULL);
// Compile the shader
glCompileShader(shader);
After compiling the shader, the status of the compile is determined and
any errors that were generated are printed out.
// Check the compile status
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if(!compiled)
{
GLint infoLen = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
if(infoLen > 1)
{
char* infoLog = malloc(sizeof(char) * infoLen);
glGetShaderInfoLog(shader, infoLen, NULL, infoLog);
esLogMessage("Error compiling shader:\n%s\n", infoLog);
free(infoLog);
}
glDeleteShader(shader);
return 0;
}
return shader;
}